FEM Surface
CATIA V5 Training
Foils
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FEM Surface
Version 5 Release 19 January 2009 EDU_CAT_EN_FMS_FI_V5R19
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FEM Surface
About this course Objectives of the course Upon completion of this course you will be able to: - Use the various Meshers such as Surface Mesher, Advanced Surface Mesher, Beam Mesher, and OCTREE Triangle Mesher - Create a new mesh using existing mesh with the help of mesh transformation tools and mesh operators - Edit the mesh using the mesh edition tools available within the above mentioned meshers - Analyze the mesh quality using mesh quality checks and tools like Free Edges, Duplicate Elements, Duplicate Nodes, Mesh Interference Checks, etc.
Targeted audience Mechanical Designers
Prerequisites Copyright DASSAULT SYSTEMES
Generative Part Structural Analysis Fundamentals, Generative Assembly Structural Analysis
16 Hours
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FEM Surface
Table of Contents (1/5) Introduction to FEM Surface What is FEM Surface User Interface Accessing the Workbench for FMS General Process for FEM Surface Analysis
Advanced Surface Mesh Advanced Surface Mesher Global Parameters Advanced Surface Local Specifications Advanced Surface Execution Tools Advanced Surface Edition Tools Domain Edition Modify Mesh Recap Exercises : Advanced Surface Mesher
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Surface Mesh Surface Mesher Local Specifications Geometrical Specification
8 9 11 17 18
19 20 22 29 43 49 57 66 72
75 76 82 84
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Table of Contents (2/5) 1D Mesh Specifications 2D Mesh Specifications Execution Tools Edition Tools Recap Exercise : Surface Mesher
OCTREE Triangle Mesher What is OCTREE Triangle Mesher Recap Exercise : OCTREE Triangle Mesher
Beam Mesher How to Mesh Using Beam Mesher How to Modify Beam Mesh Recap Exercise : Beam Mesher
Mesh Operators What is Mesh Offset What is Split Quads How to Use Move Mesh Nodes Copyright DASSAULT SYSTEMES
Mesh Transformations What is Mesh Transformations
91 98 107 109 118
120 121 125
126 127 132 133
134 135 136 137
138 139
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Table of Contents (3/5) How to Use Mesh Part Transformation: Rotation Mesh Parts Extrusion from 1D to 2D Extract 1D Coating Elements from 2D Recap Exercise : Mesh Transformation
Mesh Parameters Exposition to Knowledge Mesh Parameters Exposition to Knowledge Recap Exercises : Mesh Parameters Exposition to Knowledge
Update Mesh Edit an Existing Advanced Surface Mesh-part How to Update Mesh
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Mesh Analysis Tools What is Cutting Plane What is Elements Orientation What is Shrink Elements What is Mesh Parts Statistics How to Use Free Edges Browser About Intersections and Interferences Check How to Use Intersections / Interferences Check
141 143 144 146
147 148 152
156 157 158
159 160 161 162 163 164 165 166
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Table of Contents (4/5) How To Perform Quality Analysis How to Use Standard and Quality Visualization What is Null Size Bar Element Quality Checker What is Duplicate Element Checker What is Duplicate Nodes Checker How to Use Unmeshed Domain Browser What is Group Definition by Boundary Visualization of Meshes and Groups How to Visualize Meshes and Groups Recap Exercise : Mesh Analysis Tools
Import/Export Meshes What is Import/Export Mesh
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Welding Connections What is Analysis Connection Welding Meshing Methods - Toolbars How to Create Spot Weld Connection Mesh Spot Weld Meshing with Hemming Zone How to Analyze Failed Spot Weld Connection Meshes
168 173 174 175 176 177 178 180 181 182
183 184
185 186 187 188 191 192
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Table of Contents (5/5) How to Create Seam Weld Connection Mesh How to Create Surface Weld Connection Mesh How to Create Nodes to Nodes Connection Mesh How to Create Node Interface Mesh Recap Exercises : Welding connections
Master Exercises
206 207 214
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Master Exercise : Meshing of a Crossmember Master Exercise : Wing Structure Analysis
193 196 197 198 199
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Introduction To FEM Surface
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In this lesson you will get overview of FEM Surface workbench.
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FEM Surface
What is FEM Surface (1/2) FEM Surface or FMS provides you the tools to create surface meshes required for Analysis. Various tools are available in FMS to create, edit, analyze and visualize the surface mesh. It also provides tools to create 1-D mesh. Using FMS, it is possible to create different types of welding connection meshes between mesh parts. Geometry : CATIA-GSD V5 (Generative Shape Design)
Geometry: CATIA V4 Skin (*ski)
Meshing specification associative with design changes
Import V4 file
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Surface Meshing CATIA FMS V5
Component Structural Linear Analysis… CATIA GPS/EST V5
Assembly Structural Analysis (Linear) CATIA FEM/ELFINI V4 Solver Other FEA software (Durability, Crash, NVH,…)
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What is FEM Surface (2/2) All surface meshing tools provided by FEM Surface or FMS can be broadly classified into Mesh Parameter Specification Mesh Creation Mesh Analysis Mesh Edition Following General process can be followed to create desired surface mesh.
Analyze Mesh Enter Mesher
Apply Mesh Parameters and Specification
Required Mesh specification achieved ?
Create Mesh
Exit Mesher
NO
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Edit Mesh specification
YES
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User Interface Toolbars Meshing Methods Mesh Analysis toolbar toolbar Mesh Visualization Toolbar
Local Specifications toolbar
Welding Meshing Methods toolbar Execution toolbar
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Import/Export
Edition Tools Mesh Operators toolbar toolbar
Mesh Transformations toolbar
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User Interface – Icons (1/4) Meshing Methods
Mesh Analysis
Beam Mesher
Free edges visualization
Surface Mesher
Intersection/Interferences Duplicate Element Checker Quality Analysis Connection Summary
Mesh Visualization
Import / Export
Surface Mesher
Visualization mode
Import Mesh
Advanced Surface Mesher
Visu Type
Export Mesh
Octree Triangle Mesher
Cutting Plane
Surface Meshing Methods
Elements orientation
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Shrink elements
Visualization mode Standard Visualization
Measure Measure between
Quality Visualization
Measure Item
Orientation Visualization
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User Interface – Icons (2/4) Mesh Transformation Transformation Mesher Extrude Mesher Coating Elements
Mesh Operators Mesh Offset Split Quad Move Mesh Nodes
Transformation Mesher Translation Mesher Rotation Mesher Symmetry Mesher Extrude Mesher Extrude Mesher with Translation Extrude Mesher with Rotation Extrude Mesher with Symmetry Extrude along a Spine Coating Mesher Coating 1D Mesh
Welding Meshing Methods
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Spot Welding Connection Mesh Seam Welding Connection Mesh Surface Welding Connection Mesh Nodes to Nodes Connection Mesh Node Interface Mesh
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User Interface – Icons (3/4) Advanced Surface Mesh Local Specification Tools Boundary simplifications
Execution Geometry Simplification / Remove Simplification Mesh the Part / Remove Mesh
Add/Remove Constraints Imposed elements
Global Meshing Parameters
Domain Specifications
Edition Tools Clean holes Edit simplification Imposed elements
Domain Edition Remesh Domain Remove Mesh by Domain Lock Domain
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Remesh Domain Edit Mesh
Modify Mesh Edit Mesh Spilt Quadrangles
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User Interface – Icons (4/4) Surface Mesh
Execution Exit Global Meshing Parameter Context Options
Mesh the Part
Mesh/Update
Remove Mesh
Geometrical Specification Boundary Simplification Add/Remove Constraints on Edge Add/Remove Constraints on Vertex Project External Curve Project External Point 1D Mesh Specification Elements Distribution Elements Capture
2D Mesh Specification Frontal Quadrangle Method Frontal Triangle Method Mapped Method Mapped Free Method Minimal Method Mapped Free Method for Triangular Domain Bead Method Half Bead Method
Elements Distribution around Hole Copyright DASSAULT SYSTEMES
Distribution Propagation
Edition Tools
Local specification
Remove Mesh by Domain
Geometrical Specification
Lock Domain
1D Mesh Specification
Edit Mesh
2D Mesh Specification
Split Quadrangle
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User Interface - Tree Analysis tree Associated Part
Geometrical topology simplification Simplified geometry topology edition
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Imposed Elements
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Accessing the Workbench for FMS FMS Functionalities can be accessed through ‘Advanced Meshing Tools’ Workbench.
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1
Click on ‘Start’
2
Select ‘Analysis & Simulation’
3
Select ‘Advanced Meshing Tools’. A new CATAnalysis document is created.
4
Select an analyse type as ‘Static Analysis’.
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General Process for FEM Surface Analysis Ensure that the part has a material assigned. Open FEM Surface Workbench 1
Define global mesh parameters and specifications
2 Mesh modification
3
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Mesh specification
Mesh creation
5
Analyze mesh quality
6 Pre-processing Analysis Capabilities
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Advanced Surface Mesh You will see how to use Advanced Surface Mesher
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Advanced Surface Mesher Global Parameters Advanced Surface Local Specifications Advanced Surface Execution Tools Advanced Surface Edition Tools Domain Edition Modify Mesh Recap Exercises : Advanced Surface Mesher
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Advanced Surface Mesher
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In this lesson, you will learn how to define meshing parameters and specifications, and how to create an advanced surface mesh.
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What is Advanced Surface Mesher Advanced Surface Mesher provides following collection of tools for surface mesh generation:
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Global Parameters Specification Local Specifications (Holes, Constraints, Nodes and Domain Specifications) Mesh Execution / Creation Mesh Edition Tools
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Global Parameters
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you will learn how to specify global meshing parameters.
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What are Global Parameters (1/6) When creating a new surface mesh, the first step is to set values for Global Mesh Parameters. Global parameters lets you to specify the minimum required parameters to create mesh. Global Parameters panel is displayed
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Select the Geometry to be meshed.
A surface Mesh Object is created in the Specification Tree
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What are Global Parameters (2/6) Quadrangle Elements Mesh You will see how to Set Global Parameters values. Element shape : can be either triangle or quadrangle type. Element type : linear or parabolic. Mesh size : global size assigned to the mesh’s elements. Offset : Value according to which both the geometrical simplification and meshing will be offset. If offset is previously applied on geometry in order to have a neutral fiber, mesh offset is automatically computed from design information (GSD). Offset value is then grayed. Quads only: check this if you require only quads in the surface mesh. Uncheck “Quads only” button to specify that triangles are accepted. Minimize triangles: Minimize number of triangles in the mesh.
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Directional mesh: Produces a regular mesh based on a privileged direction of the domain. Strip optimization: Allows optimizing the position of the nodes in tight zones in order to improve the quality of the elements. Automatic mesh capture mode: When activated, all external nodes in a given tolerance are captured. Mesh capture is performed dynamically on all the constraints (free edges, internal edges, external edges) and after all constraints modifications.
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FEM Surface
What are Global Parameters (3/6) Geometry Click “Geometry”
Constraint sag defines : maximal gap allowed between the mesh and the geometry. edges constraint for the geometry simplification. Constraint ref size independent from mesh size: If this option is checked, you can keep simplified geometry while modifying global mesh parameters after geometry simplification or editing simplification. Angle between faces and Angle between curves: Values defining the maximum angle allowed under which the common frontier (edge or vertex) is not constrained for the geometry simplification.
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This edge will be constrained if the angle between the two faces is greater or equal to 10 degrees
Min holes size: Value defining the hole size under which geometry simplification remove them. Merge During Simplification: Allows to merge geometrical constraints that are too close to each other to avoid to generate elements that are too small. Automatic curve capture: When activated, external curves (free edges or constrain curves) in a given tolerance are captured.
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What are Global Parameters (4/6) Triangular mesh with sag control
Triangular mesh with sag control option Controlled by an absolute sag value Controlled by the ratio between the Absolute sag and the local element size value
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Produces boundary mesh suitable to be used with tetrahedron filler (FMD product)
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FEM Surface
What are Global Parameters (5/6) Details Simplification An automatic geometric simplification is performed according to the “Merge during simplification - Minimum Size” value Fillet Elimination
Short Curves Suppression Before simplification
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After simplification
Fillet replaced by a constrained topological edge for mesh
Shape simplified
Edges suppressed
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What are Global Parameters (6/6) Geometric Elements Visualization
Unspecified edges are displayed with white color
Gaps are displayed with pink color
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Click OK
Free edges are displayed with green color
The “Local Specification Tools” toolbar is now available
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Advanced Surface Local Specifications
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You will learn how to specify local mesh parameters.
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What are Local Specifications Global Parameters specify mesh properties for whole part. However, some regions in part may need different mesh properties. You can specify these mesh properties through Local specifications Toolbar. You can use this in following situations: Boundary Simplifications To neglect small holes, faces, cracks while meshing. Add / Remove Constraints To select or neglect specific edges, curves, vertices and points from meshing. Imposed Elements To specify desired number of nodes and node distribution pattern on an edge or around a hole. Domain Specifications
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To specify different mesh pattern for some region in part.
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How to Use Boundary Simplification Tools (1/3) Holes and gaps can be automatically or manually removed from the topology definition. 1
Click on the ‘Boundary Simplification’ icon in the Local Specifications Tools toolbar
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4
2
Check Auto Focus to show the holes and gaps
Click on ‘Holes’ Tab and select the holes to ignore by directly clicking on them
Removed holes turn from green to blue.
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How to Use Boundary Simplification Tools (2/3) You can manually remove gaps and cracks by selecting them with the mouse. Auto-focus can help you checking gaps and crack in a single click. Gap Suppression
2
Crack Suppression
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How to Use Boundary Simplification Tools (3/3)
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You can manually remove faces by selecting them with the mouse. 1
Click on Faces and select the Face to remove
2
Face Suppression
Option will replace the simplified geometry by a stretched face (fill)
Selection by feature is available. Undo/Redo is also available
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Constraining Curves by Selecting Face or Feature 1
Click on the “Add/Remove” constraints icon in the Local Specifications Tools toolbar
If the geometry of the connected part changes, the constrained curves will change too.
2
Select Curves, and click on the face to constraint : all the face boundary curves are constrained.
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3 Select Curves, and click on the feature curve to constraint. The intersection curve is constrained and geometry modification is handle.
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FEM Surface
Using Capture Methodology with Add Constraints You will see Capture methodology with Add constraints command : Click on the Surface Mesher icon. Select the surface and the Automatic capture option. Enter a Tolerance value.
3
Click OK : nodes capture is automatically done.
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2
Click on the Add constraint icon (Curves). Edge selection by path. First selection with shift key pressed : start of path. Second selection on highlighted edges : end of path
After modifications, do a global update to keep a compatible mesh. Automatic capture capability do not work with imported meshes. Then, check your mesh with free edges visualization.
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FEM Surface
How to Use Imposed Elements (1/3) 1
Click on the Imposed element icon in the “Local Specification Tools” toolbar
2
Select a geometry to create a node distribution (constrained or free edge)
3
Set the node distribution parameters
4
Set the type of distribution: uniform, non uniform (arithmetic, geometric)
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Multi-selection is available
5
Click OK
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How to Use Imposed Elements (2/3) 1
Click on the Imposed Elements icon in the “Specification Tools” toolbar and select capture Tab
2
Select a meshed edge
Receiver
Source
Set the Capture parameters
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If you want to link the two meshes (between captured edge and edge part), select Coincidence and Condensation. Furthermore, a sufficient tolerance must be entered to find the two edges.
Mesh-parts need to be re-meshed after modifications in order to keep mesh compatible (do a global mesh update). You can check your mesh is compatible by selecting the free edges visualization.
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FEM Surface
How to Use Imposed Elements (3/3) 1
Click on the Imposed elements icon in the “Local Specification Tools” toolbar
2
Select Mesh Around Holes
3
Enter a number of elements and a number of rows around the hole. Specify heights of rows.
4
Click OK.
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1 row specified
Height of row 1 : 5mm
Height of row 2 : 7mm
2 rows specified
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FEM Surface
How to Use Domain Specifications (1/2) Click on the Domain Specification icon in the “Specification Tools” toolbar
2
Select the geometry
3
Select the meshing method
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Ability to define mapped mesh on imposed point, it allows regular meshes with point constraints (example: mapped on flanges with compatible mesh points)
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How to Use Domain Specifications (2/2) 4
Enter Mesh size
5
Click Ok
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Click Ok
Mesh-Part can be meshed with different method and element size. Domain specification are stored in the tree.
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Global Meshing Parameters (1/2) You can modify Global Parameters during Specification Step and Edition Step.
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Element type: linear or parabolic
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Global Meshing Parameters (2/2) You can modify Global Parameters after Geometry Simplification. If you change : Minimise Triangles or Directional Mesh, only the Mesh will be invalidated and the Geometry Simplification won’t be impacted.
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If you change : Mesh Size, Offset, Constraint Sag …, the Geometry Simplification will be invalidated.
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Advanced Surface Execution Tools
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You will see the tools to create and remove mesh and geometry simplifications.
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What is Execution Execution tools are used to create or remove mesh. You can also switch to Local Simplification tools using remove simplification icon. Execution Tools use an Intermediate Topology which stores Local Specifications. Execution Remove tools may simplify interactions between CAD and CAE modules :
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CAD
FMS
Intermediate Topology
CAE
CAD topology made by designers is modified for meshing by analysis engineers through an FMS intermediate topology. Details can be ignored from the initial topology, like holes or gaps, and a final simplified topology can be meshed. This implies an important time saving and an easier interaction between CAD and CAE.
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How to Use Execution Tools (1/4) Execution tools help in Pre-Visualization of the topology which will be used for mesh creation. 1
Click on the Geometry simplification icon in the Execution toolbar.
The topology is created according to your specifications and displayed (free edges with green color and constrained edges in yellow).
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The mesh will be based on this topology. It allows to create geometry simplifications and mesh specifications without modifying the reference geometry.
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How to Use Execution Tools (2/4) Remove Simplification allows to remove the resulting simplified geometry to improve its definition going back to the Local Specifications Toolbar. 2
Click on “Remove Simplification” icon in the Execution toolbar.
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Say YES to delete simplifications and go back to the Local Specifications Toolbar.
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How to Use Execution Tools (3/4) With Mesh the Part, you can create your Mesh. 3
Click on “Mesh the Part” icon in the Execution toolbar.
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The Mesh will be created.
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How to Use Execution Tools (4/4) With Remove mesh, you can quickly delete the mesh you had built. 4
Click on “Remove mesh” icon in the Execution toolbar.
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The Mesh is deleted, keeping your simplifications.
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Advanced Surface Edition Tools
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You will know the tools to edit the mesh.
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What are Edition Tools Mesh edition offers same functionalities as Local Mesh Specification, however, it allows you to modify mesh run time by changing specifications. In addition to this you can edit mesh at element and nodes level. You can manually move the node, delete the node, add node on element edge. You can split quadrilateral element into triangular element, swap the element edges, remove the edge. Clean Holes Edit Simplifications Imposed Elements Re-Mesh Domain Remove Mesh by Domain Lock Domain Edit Mesh Copyright DASSAULT SYSTEMES
Split Quadrangles Warning : Local Edition modification are lost if simplified geometry is removed
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How to Use Mesh Edition - Clean Holes Holes can be filled/unfilled at any time, with only a local impact on the mesh. 1
Click on the “Clean Holes” icon in the Edition Tools toolbar
2
Select the hole on the design. Set Auto remesh option. The mesh is locally modified with the hole ignored.
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What is Edit Simplification Edit Simplification provides following functionalities: Swap Constrained State : Constrain or unconstrain an edge. Collapse edge : Merge the two end-points of a constraint into one point . Cut edge : Cut an edge in two parts. Merge edges : Simplify and merge two lines into one. Split a Domain : Add/remove an imposed crossing line between two vertices. Orthogonal Split on Domain : Perform an orthogonal split from start vertex by simple click on destination edge. Remove Vertex : unconstrain a vertex. Undo simplification : Undo a mesh modification.
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Drag : move a constrained vertex.
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How to Use Edit Simplification (1/3) With Manual Simplification function, you can add or remove meshing constraints like Edges, Vertices and Swap, Split, Collapse or Merge conditions. 1
Click on Edit Simplification icon in the Edition Tools toolbar The Edit box is displayed Choose this option if you want the computer to re-mesh automatically.
2
With a right click, a contextual menu appears Constraint inactivation without re-meshing Unwanted constraints (edge/vertex) can be removed without re meshing impacted domains
For edges
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For vertices
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How to Use Edit Simplification (2/3)
Swap
Split
Before
Collapse
Cut Edge
Merge Edges
Undo Simplifications
Click on both edges
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After
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How to Use Edit Simplification (3/3) Using Edit Simplification, boundary of a filled hole can now be constrained. Split constraint can be created over a filled hole. 1
Click on the “Boundary Simplifications” icon in the Specification Tools toolbar. Select the filled hole.
2
4
Click right on a vertex of the edge to constrain : Split a Domain. Click left on the other vertex : the edge is constrained over the hole.
Click on the “Geometry Simplification” icon.
3
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Click on the “Edit Simplification” icon in the Specification Tools toolbar. Select the edge to constrain.
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How to Use Imposed Elements Mesh Edition Tool This modification function works exactly the same way as in the specification step. Click on the “Imposed Nodes” icon in the Edition Tools toolbar
2
Choose imposed elements corresponding tab
3
Select a geometry to create a node distribution
4
Choose distribution type: uniform, geometric, arithmetic and needed input parameters
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5
7
Choose tolerance, nodes coincidence and condensation activation if needed
6
Choose a number of nodes for this geometry
Recompute the mesh
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Domain Edition
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You will see how to apply different mesh methods to domains.
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What is Domain Edition When you apply Global Specifications you will find that the whole geometry is divided into bounded regions called Domains. You can apply different element type, element size and mesh type to different domains as per requirement using Domain Edition Tools.
Domains
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Free tria
Free quads
Mapped quads
Free quads
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How to Use Re-Mesh Domain
1
Click on the “Re-Mesh a Domain” icon in the Edition Tools toolbar
2
Select a domain (area closed by constrained edges)
3
Set mesh local parameters (method and size)
4
Click OK.
Mapped Triangle
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How to Use Mapped Quads Method Mapped quads mesh type is used to get regular and uniform mesh with rectangular or square shape quadrilateral elements.
Change mesh size to 2 mm.
2
Change method from Front Quads to Mapped Quads.
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How to Use Bead Quads Method Bead Quads Method is used for bead shaped domains where it is not possible for free quads to exactly map the geometry into mesh.
1
Front Quads Method
With Free Quads Method you will get poor mesh quality
Select Bead Quads Method in drop down
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How to Use Projection Method Projection mesh type permits to reproduce the same meshing on a surface from already meshed part. 1
Click on Remesh domain icon and choose Mesh type as Projection
2
Select the curve on which mesh will be projected There are a meshed surface and a projected area of it on an other surface
3
Select the mesh to be projected
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And click OK After the re-mesh, both surfaces have the same mesh shape.
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How to Use Mesh Mapping Method Contrary to the projection mesh method, you have to define the correspondence between vertex and node in case of mapping mesh method. Click on the “Re-mesh a Domain” icon and Select Mapping method.
3
Select a vertex on the domain that will receive the projected mesh to identify it with the nearest node of the mesh domain.
4
Select the corresponding node on the meshed domain.
5
The mesh is modified as a projection of the first mesh.
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2
Select first the receiving domain. Then select the meshed domain ( domain you want to map on the receiving domain).
The surfaces can be different, orthogonal or parallel but they must have the same number of edges.
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How to Use Remove Mesh By Domain With Remove Mesh, you can quickly delete a domain of the mesh you had built. Click on “Remove Mesh By Domain” icon to limit a mesh deletion to a given domain.
2
Choose an intersection polygon trap. Select the domains to remove.
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How to Use Lock Domain Locked domains are protected against : Manual edition Re-meshing Impact on constraint edition Trap selection Click on the “Lock Domain” icon in the Modification Tools toolbar.
2
Choose an intersection polygon trap. Select the domains to lock.
3
Locked domains are drawn transparent with the current mesh-part colour.
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Modify Mesh
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You will learn how to manually modify mesh using Edit Mesh and Split quadrangles.
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What is Edit Mesh (1/4) Edit Mesh allows the user to manually modify the mesh in order to improve its quality.
Allows optimizing the shape of the element so that split elements meet desired Analysis criteria. When this option is activated (the shape of the neighbor elements is altered in order to have the best possible quality of the elements). Allows combining two triangles into a quadrangle of good quality (when possible).
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Allows dragging a node on a surface. Allows propagating smoothing modifications from one domain to a neighboring one. Lets you launch the Quality Analysis again.
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What is Edit Mesh (2/4) With the mouse you can modify nodes and elements to improve the mesh
With a right click on a element: To split a quadrangle into 2 triangles To condense an element
Before clicking to modify, the result appears highlighted
With a right click on a element edge: To remove edges: 2 triangles into a quadrangle To condense nodes on edges Copyright DASSAULT SYSTEMES
To insert a node on an edge A quadrangle is split into 2 triangles: to swap diagonal choice Click on a node: you can move it
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What is Edit Mesh (3/4) Elements collapsing with pre-highlight of operation Right click into a quadrangle element : Sm
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Sm
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What is Edit Mesh (4/4) Edge swapping with pre-highlight of operation. Right click on a quadrangle edge :
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Smoothing off
Smoothing on
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What is Split Quadrangles Split Quadrangles is used to split quadrilateral elements into triangular elements. This provides you following options:
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Option to split all bad, poor elements or all elements Allows quick solve of warping and distortion problems Global or local (trap selection)
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Advanced Surface Mesher Recap Exercises 50 min
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Floor Mesh Fuselage door Static Analysis
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Floor Mesh Recap Exercise 20 min
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In this step you will : create a surface mesh on a part Use Boundary Simplifications Apply domain Specifications
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Fuselage Door Static Analysis Recap Exercise 30 min
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In this exercise you will : create a mapped surface mesh on the fuselage Apply domain Specifications create a static analysis
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Surface Mesh You will know how to use Surface Mesher.
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Surface Mesher Local Specifications Geometrical Specification 1D Mesh Specifications 2D Mesh Specifications Execution Tools Edition Tools Recap Exercise : Surface Mesher
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Surface Mesher
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In this lesson, you will learn how to generate a 2D mesh using Surface Mesher.
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What is Surface Mesher You will see the Surface Mesher. Select the surface to be meshed Select Surface Mesher icon The Global Parameters dialog box appears. Choose the shape and the type of the elements Available options depends on the shape. Mesh Tab Shape: Triangle or Quadrangle elements.
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Type: Linear or Parabolic elements.
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What are Global Parameters (1/4) Mesh Tab : For Triangle Method Mesh size: global element size assigned to the mesh. Absolute Sag: maximal gap between the mesh and the geometry. Relative sag: ratio between the Absolute sag and the local mesh edge length. Relative sag value = (Absolute sag value) / (local mesh edge length value). Min size: minimum value of the mesh size. Only available when you want to use Absolute sag or Relative sag.
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Automatic mesh capture: when activated, mesh capture and condensation are performed dynamically on all the constraints (free edges, internal edges, external edges) and after all constraints modifications. Mesh can only be captured on updated mesh part. You can filter Mesh Parts to be captured Mesh can only be captured on updated mesh part. Tolerance: maximum distance for mesh capture.
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What are Global Parameters (2/4) Mesh Tab : For Quadrangle Method Mesh size: global element size assigned to the mesh. Quads Only :check this if you require only quads in the surface mesh. Uncheck “Quads only” button to specify that triangles are accepted. Default method: lets you choose a mesh method that will be applied every time it is possible.If this option is activated, you can choose between the following methods: Mapped free mesh or Minimal mesh Automatic mesh capture: when activated, mesh capture and condensation are performed dynamically on all the constraints (free edges, internal edges, external edges) and after all constraints modifications.Mesh can only be captured on updated mesh part.
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You can filter Mesh Parts to be captured Tolerance: maximum distance for mesh capture.
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What are Global Parameters (3/4) Geometry Tab Constraint sag: This value pilot the creation of constraint on surface patch edges. If the elements sags are higher than the Constraint sag value at an edge location, this edge is constrained. This does not guarantee that the whole mesh respects the sag value but helps creating constraints. For a given mesh size, the lower the constraint sag value, the more numerous the constraints are created, and vice versa. Sag = 0mm
Sag = mesh size
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Constraints independent from mesh size : by default the Mesh size value pilot the topological regrouping. If you activate this option, you can specify a reference value.
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What are Global Parameters (4/4) Geometry tab Add sharp edges : Values defining the maximum angle allowed under wich the common frontier (edge or vertex) is not constrained for the geometry simplification Min holes size: Value defining the hole size under wich geometry simplfication remove them Offset: value according to which both the geometrical simplification and meshing will be offset Automatic curve capture: when activated, external curves belonging to already meshed surface could be captured in a given tolerance. Mesh can only be captured on updated mesh part. Geometry Selection to filter captured meshparts is possible Copyright DASSAULT SYSTEMES
Tolerance: maximum distance for curve capture.
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Local Specifications
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Local Specifications provide tools to specify Local Parameters for the mesh.
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What are Local Specifications Local Specifications provide following Tools to specify local mesh parameters. Geometrical Simplification This is used to specify simplified geometry related local mesh parameters. 1D Mesh specifications This is used to specify local nodes distribution on edges and holes. 2D Mesh specifications
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This is used to specify local element type and distribution on surfaces.
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Geometrical specification
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You will see the local mesh specification tool for Surface Mesher
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What is Geometrical Specification Tool Geometric Specification tool provides local mesh specification in surface mesher to give localized mesh parameters. Boundary Simplifications This is used to select the holes you want to ignore or to be taken into account in the meshing process Add/Remove Constraint on Vertices This is used to add / remove constraint applied to vertices. Add/Remove Constraint on Edges This is used to add / remove constraint applied to edges. Project External Curves To constrain external curves by projecting them Copyright DASSAULT SYSTEMES
Project External Point To constrain external points by projecting them
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What is Boundary simplification
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Boundary simplification allows to take into account or ignore holes. You can activate (take into account) or inactivate (ignore) an hole by selecting it as support. Auto focus to zoom in activated holes, diameter is given as information
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What is Add/Remove Constraints on Edge Add / remove constraint on edge allows to constrain or unconstraint edges. Select an edge or several edges as support and specify the mode: constrained or unconstrained.
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Constrained edges are displayed in yellow and Unconstrained edges in blue. The Trap Type toolbar lets you use the trap multi-selection.
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What is Add/Remove Constraints on Vertex Add / remove constraint on vertex allows to constraint or unconstraint vertices. You can select a vertex or several vertices as support and specify the mode: constrained or unconstrained. Constrained vertices are displayed in yellow or red, yellow if it’s an intersection between two constrained or/and free edges, red if it’s an intersection between more than two constrained and/or free edges. Unconstrained vertices in blue You can select yellow vertices and choose to unconstraint them:
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Select Blue vertices and choose to constraint them:
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What is Project External Curve
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Project external curves allows you to constrain external curves on the surface to be meshed. You can select one or several curves as support and specify the tolerance (maximal distance allowed between curve, source, and surface, receiver)
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What is Project External Points
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Project external points allows to constrain external points on the surface to be meshed. You can select one or several points as support and specify the tolerance (maximal distance allowed between point, source, and surface, receiver)
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1D Mesh Specifications
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You will see how to specify distribution of Nodes and elements on edges and holes.
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What is 1D Mesh Specifications 1D Specifications are related to specifying nodes and elements on edges and holes. Elements Distribution This is used to specify the distribution of elements on the free or constrained edges Elements Capture To capture the elements on free or constrained edges. Elements Distribution around Hole To specify element distribution around hole.
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Distribution Propagation To specify the propagation method for nodes distribution from source to target.
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What is Element Distribution (1/2) Elements Distribution allows to impose nodes with a uniform or non uniform distribution. You can select the edge on which you want to impose nodes . Choose the type of distribution and number of nodes: Uniform: distance between all the distributed nodes will be the same. Number of elements: to impose a number of division on the selected edge. Or Size: to impose a mesh size on the selected edge. Arithmetic: distance between the distributed nodes will be defined by a common difference computed with the following parameters (specify two parameters) Number of Edges: to specify how many edges you want. And/Or Size 2 / Size 1: ratio between lengths of last and first distribution edge. And/Or Size at node 1: length of first edge of the distribution. And/Or Size at node 2: length of last edge of the distribution.
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Symmetric: distribution should be symmetric or not.
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What is Element Distribution (2/2) Elements Distribution allows to impose nodes on one or several connected edges with a uniform or non uniform distribution. Geometric: the distance between the distributed nodes will be defined by a common ratio computed with the following parameters (specify two parameters). Size 2 / Size 1: ratio between lengths of last and first distribution edge. Size at node 1: length of first edge of the distribution. Size at node 2: length of last edge of the distribution.
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Symmetric: distribution should be symmetric or not. User Law: distance between the distributed nodes will be defined by a knowledge law previously defined in the Product Advisor workbench. Law: select the desired law. Number of edges: to specify how many edges you want.
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What is Elements Capture Elements Capture allows to capture neighbor mesh part nodes on free edges or on constrained edges. Support : Lets you select the edge on which you want to impose nodes. Tolerance: distance between the source edge and receiver edge
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Activate or inactivate the following option: Coincidence: new nodes will be created at the captured ones location. Condensation: no new nodes are created, mesh will be created using the captured nodes.
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What is Elements Distribution Around Holes Elements distribution around holes allows to specify how many elements you want around a hole, how many rows and elements heights. Select the hole on which you want to impose nodes as support. Whatever the number of curves making out the holes, multi-selection is automatic. You do not need to select each curve making out the hole.
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Number of elements Number of rows: one, two or three rows Heights of elements: to specify the height of rows around the hole. If this option is deactivated the eight is automatically computed
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What is Distribution Propagation Distribution propagation allows to propagate an existing node distribution to a specified support. Select the edge on which you want to propagate the node distribution as support. Multi-selection is available except for non-manifold configurations (for example multi-selection is not available in the case of a T-configuration). Select the distribution you want to propagate as sources. Multiselection is available for connected and manifold configurations.
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Proportional: lets you preserve the relative distance between nodes: Normal: keeps the source-target vector direction normal to the target support: Directional: keeps the source-target vector direction parallel to a given direction: Axis: lets you specify the axis that gives the direction of the propagation If the domain is a squared containing four corners, you can select the domain, then the Support and Sources fields will be automatically updated.
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2D Mesh Specifications
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You will see tools to apply mesh specifications for surfaces.
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What is Frontal Quadrangle Method You can re-mesh a domain using frontal quadrangle method. Support : Select the domain you want to re-mesh. If you activate Impact neighbor domains the new mesh method will be applied to the neighboring domains. If the option is deactivated, the nodes on domain edges will not be modified.
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Mesh size : Specify the size of the elements edges.
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What is Frontal Triangle Method You can re-mesh a domain using frontal triangle method. Support : Select the domain you want to re-mesh. If you activate Impact neighbor domains the new mesh method will be applied to the neighboring domains. If the option is deactivated, the nodes on domain edges will not be modified.
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Mesh size : Specify the size elements edges.
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What is Mapped Mesh Method You can re-mesh a domain using mapped method. Support : Select the domain you want to re-mesh. If you activate Split quadrangles, you will mesh using triangular elements by splitting the generated quadrangular elements. If you activate Impact neighbor domains the new mesh method will be applied to the neighboring domains. If the option is deactivated, the nodes on domain edges will not be modified.
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Mesh size : Specify the size elements edges.
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What is Mapped Free Method You can re-mesh a domain using mapped free method Support : Select the domain you want to re-mesh. If you activate Impact neighbor domains the new mesh method will be applied to the neighboring domains. If the option is deactivated, the nodes on domain edges will not be modified.
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Mesh size : Specify the size elements edges.
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What is Minimal Method You can re-mesh a domain using minimal method Support : Select the domain you want to re-mesh.
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If you activate Impact neighbor domains the new mesh method will be applied to the neighboring domains. If the option is deactivated, the nodes on domain edges will not be modified.
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What is Mapped Method for Triangular Domain You can re-mesh a domain using mapped method for triangular domain. It will generate triangles to respect the triangular shape of the domain Support : Select the domain you want to re-mesh. If you activate Impact neighbor domains the new mesh method will be applied to the neighboring domains. If the option is deactivated, the nodes on domain edges will not be modified.
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Mesh size : Specify the size elements edges.
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What is Bead Method You can re-mesh a domain using bead method. It will generate 2 triangles at each end of the bead to respect the shape of the domain Support : Select the domain you want to re-mesh. If you activate Impact neighbor domains the new mesh method will be applied to the neighboring domains. If the option is deactivated, the nodes on domain edges will not be modified.
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Mesh size : Specify the size elements edges.
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What is Half Bead Method You can re-mesh a domain using half bead method. It will generate 2 triangles at one end of the bead to respect the shape of the domain Support : Select the domain you want to re-mesh. If you activate Impact neighbor domains the new mesh method will be applied to the neighboring domains. If the option is deactivated, the nodes on domain edges will not be modified.
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Mesh size : Specify the size elements edges
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Execution Tools
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You will see how to use Execution Tools to create and remove mesh and mesh specifications.
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What are Execution Tools Execution Tools are used for creating and pre-visualization of mesh. It is possible to modify mesh specifications during run time. Global Meshing Parameters You can modify the Global mesh parameters through edition tools. Context Options You can check to remesh automatically after each modification Mesh the Part According to global parameters and local specifications, mesh will be generated. The Mesh The Part dialog box appears and provides you a summary on the surface mesh Remove Mesh
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To delete the mesh, global parameters and local specifications are stored in the tree, mesh edition (Editions Tools) will be lost
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Edition Tools
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You will see how to edit mesh to improve mesh quality.
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What are Edition Tools Edition tools allows to Edit Mesh Parameters already specified.
Remove Mesh by Domain To remove mesh from the domains. Lock Domain To lock the domains so that they will not be modified by neighboring mesh Edit Mesh To manually edit the elements and nodes
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Split Quadrangle To split quadrangles into triangular elements.
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How to Use Remove Mesh by Domain
Click the Remove Mesh by Domain
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Select the mesh of the single domain or domains you want to remove
Multi-selection using the Trap Type dialog box. Using an intersection polygon trap: all the domains which intersect the trap will be selected. Using an inclusive polygon trap: all the domains that are completely included within the trap will be selected.
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How to Use Lock Domain
1
Click on Lock Domain icon and Select the domain to be locked
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Locked domains are displayed in blue
Multi-selection using the Trap Type dialog box. Using an intersection polygon trap: all the domains which intersect the trap will be selected. Using an inclusive polygon trap: all the domains that are completely included within the trap will be selected.
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What is Edit Mesh Tool (1/4) You modify manually nodes and elements using Edit Mesh icon
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Edit Mesh options can be activated or not: Smooth around modifications: the shape of the neighbor elements is altered in order to have the best possible quality of the elements. Combine around modifications: allows combining two triangles into a quadrangle of good quality (when possible). Swap around modifications: allows dragging a node on a surface. Propagate to neighbour domains: allows propagating smoothing modifications from one domain to a neighboring one. Global Optimization: lets you launch again the Quality Analysis.
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What is Edit Mesh Tool (2/4) With the mouse you can modify nodes and elements Modification on Surface Elements using its contextual menu Split, result is highlighted
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Condense elements
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What is Edit Mesh Tool (3/4) Modification on Edge Elements using its contextual menu
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To remove edges: 2 triangles into a quadrangle To condense nodes on edges To insert a node on an edge Swap Edge: A quadrangle is split into 2 triangles: to swap diagonal choice
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What is Edit Mesh Tool (4/4) Modification on Nodes To move a node: Click on one node, keep mouse key pressed and move to the required location
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To optimize node location: Click on one node: the node is automatically moved to the optimum location.
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What is Split Quadrangles You can split bad and/or poor quality quadrangles elements into triangles
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Element quality: to specify the elements to split depending on their quality. You can choose Bad, Bad and poor, Poor and All elements qualities Element selection: to specify the elements to split depending on their location using the trap type elements selection method Do not use Element Selection parameter if you want to perform the split quadrangles functionality on all the mesh part. You have only to click on it.
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Surface Mesher Recap Exercises 75 min
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Meshing of a Fuselage Pan Frt Floor Mesh
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Meshing of a Fuselage Recap Exercise 60 min
In this exercise you will :
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Create first fuselage mesh using minimal method Extract 1D Coating Elements Change elements visualisation Create second fuselage mesh using mapped free method Extract 1D Coating Elements
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OCTREE Triangle Mesher
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You will know how to use OCTREE Mesher
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What is OCTREE Triangle Mesher
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Global Tab You can create a 2D Octree triangle mesh with global specifications.
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What is OCTREE Triangle Mesher Local Tab
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You can apply local specifications to your Octree global mesh.
You can now apply loads or restraints to these points.
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What is OCTREE Triangle Mesher Quality Tab
Criteria: lets you choose a criterion (Shape, Skewness or Stretch) to optimize the mesh quality. Intermediate nodes parameters: only available if you have chosen a Parabolic element type.
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This option lets you choose the position of parabolic tetrahedron intermediate nodes (Jacobian or Warp). The distance (d) between the geometry and the intermediate node is function of Jacobian and Warp values.
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What is OCTREE Triangle Mesher Others
Geometry size limit : Lets you specify the maximum size of the geometrical elements ignored by the mesher. If an edge length is smaller than this value it will ignored by the mesher. Mesh edges suppression : Lets you specify the minimum alowed length for an finite element edge. Element with smaller length edges will be removed automaticaly. Min. size for sag specs : Lets you specify the minimum size of the mesh refining due to sags specifications.
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Max. number of attempts : Lets you impose a maximum number of iteration done by the mesher to succeed in meshing.
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Octree Mesh on Block Cylinder Recap Exercise 15 min
In this exercise you will use advanced meshing tools to generate a good quality octree mesh of a block cylinder. In this exercise you will use:
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Octree Mesher Global Specification Local Specification Other Specification
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Beam Mesher
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You will learn how to use Beam Mesher.
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How to Mesh Using Beam Mesher (1/5) 1
Click on the “Beam Mesher” icon and select the wire-frame geometry to mesh.
2
Choose element type: linear or parabolic
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Enter an element size
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Enter sag parameters
Click Apply to generate the Mesh Mesh with sag control
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Mesh without sag control
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How to Mesh Using Beam Mesher (2/5) Add / Remove Isolated Points : Ability to project geometric points as constraints for the 1D Mesher.
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Click on ‘Add Isolated Points’, select point and enter a tolerance: distance between point and wireframe to be meshed
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How to Mesh Using Beam Mesher (3/5)
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Selection of meshparts to be captured. Only updated meshparts are captured.
When updated mesh parts are captured, program will automatically detect the nodes to capture.
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Automatic mesh capture in a given tolerance
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How to Mesh Using Beam Mesher (4/5) You can apply a nodes distribution on an edge
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Choose Distribution type:
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Enter expected parameters (depending on chosen distribution type)
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How to Mesh Using Beam Mesher (5/5) 10
Angle between curves:
Geometry contains internal vertices
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Lets you define the highest tangency discontinuity accepted before imposing a nodes to keep an acceptable description of the geometry.
Internal vertices can be constrained only in case of discontinuity.
Resultant mesh
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How to Modify Beam Mesh 1
Click on Edit Mesh. The mesh parameters must have been applied (Apply button)
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Moved node
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Click on Move node : select a node and move it (hold left mouse button). Fix a node with Freeze mode.
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Edge: Choose to split or condense an edge
Split edge
Condense edge
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Hybrid Mesh: 1D and 2D Recap Exercise 30 min
In this exercise you will use advanced meshing tools to generate a good quality octree mesh of a block cylinder In this exercise you will :
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generate a 1D mesh Use capture nodes between 1D meshes and 1D-2D meshes Create and analyse a static case Modify/add and connect 1D meshes
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Mesh Operators
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You will study the tools which work on existing mesh to improve mesh quality.
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What is Mesh Offset Offset Operator offsets Mesh relatively to its previous position. The Offset field in the Mesh Offset dialog box allows you defining which offset you want to apply relatively to a given normal.
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To modify the direction of the normal, click on one of the arrows.
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What is Split Quads
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Split quads command allows a quadrangle to triangle conversion. The diagonal to split is selected according either : Shortest diagonal Best quality (best of the two combinations based on currently selected quality criterion)
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How to Use Move Mesh Nodes Move Nodes allows to move one or several nodes of a meshpart to a geometrical point or a set of points in a given tolerance Click on the “Move Mesh Nodes” icon
3
Select one point or a set of points and enter tolerance.
2
Select the mesh-part
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Mesh Transformations
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In this lesson, you will learn how to transform the mesh, how to extrude it and how to extract 1D elements.
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What are Mesh Transformations (1/2) Transformation Tools provide Ability to generate a new Mesh Part by transformation of an existing one: Symmetry, translation or rotation Option to condense nodes in order to generate compatible mesh
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Half Geometry
One Meshpart and its symmetry
Generated Mesh with compatible nodes
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What are Mesh Transformation (2/2) Translation MeshPart: lets you select the parent mesh part Direction: lets you choose the direction of the translation Distance: lets you choose the value and the orientation of the translation (in millimeters) Rotation MeshPart: lets you select the parent mesh part Axis: lets you select the axis of rotation Angle: lets you select the angle of rotation (in degrees) Capture: lets you capture the existing mesh Repeat Rotation: to repeat the operation Symmetry MeshPart: lets you select the parent mesh part Plane: lets you select the plane of symmetry Capture: lets you capture the existing mesh Common Capture Frame No condensation: lets you decide to not condense the nodes of the symmetric and the parent mesh part Condensation With The Parent Mesh Part: lets you condense the nodes of symmetric mesh part with the parent mesh part Condensation With All Mesh Parts: lets you condense the nodes of the symmetric mesh part with all the neighboring mesh parts Repeat Translation: to repeat the operation ( it will decrease number of meshparts)
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How to Use Mesh Part Transformation: Rotation 1
Click on rotation Mesher icon.
2
Select the mesh part whose copy is to be created by Rotation.
3
Select the line as axis and set the rotation angle value at 30°.
4
Activate “Condensation With All Mesh Part”.
5
Enter 1 as number of copies and Click on mesh Button.
With “Condensation With All Mesh Part” option the new created mesh will be consistent with the others, i.e. the boundary nodes will be condensed
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Mesh Parts Extrusion From 1D to 2D (1/2)
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2D elements creation using extrusion 1D elements are extruded to create quadrangle elements Extrusion can be translation, rotation, symmetry or along a spine User have control on the number of layers generated and their distribution Ability to condense nodes in a given tolerance
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Mesh Parts Extrusion From 1D to 2D (2/2) Mesh Transformation Translation
Along a Spine
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Rotation
Symmetry
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Extract 1D Coating Elements From 2D (1/2) You can create a 1D mesh part by extracting edge elements of an existing 2D mesh part.You will then generate 1D elements (bar or beam).
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Enter Global Parameters: Mesh Parts: lets you select the 2D mesh parts from which you will create the 1D mesh part. (Multi-selection of 2D mesh parts is available) You can select Surface Mesh part, Advanced Surface Mesh part, Octree Triangle Mesh part or Coating 2D Mesh part or any 2D transformed mesh part. The 2D mesh parts must be updated. Remove: lets you remove a selected mesh part. Remove All: lets you remove all the selected mesh parts. Extraction type: to specify the edge element you want to extract All edges: each edge of the surface mesh parts Boundary edges: each boundary edge of the surface mesh Internal edges: each internal edge of the surface mesh parts , no boundary edge Constrained edges: each constrained edge (yellow edge) of the surface mesh parts Non constrained edges: each non constrained edge (blue edge) of the surface mesh parts None: only the local paremeters will be used.
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Extract 1D Coating Elements From 2D (2/2) Local Parameter: Add a local parameter : lets you include or exclude elements.
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Support: to select one or several edges you want to add or remove locally from the set of edge elements you want to extract. Multi-selection of edges is available. You can also select the 1D groups created under mesh parts. Include: to add to the set of edges or groups you will extract. Exclude: to remove from the set of edges or groups you will extract.
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Extrude 1D Element Into 2D Mesh Recap Exercise 15 min
In this exercise you will generate 1D mesh from a profile, extrude with rotations 1D elements into 2D mesh, check mesh quality. In this exercise you will :
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From a Profile generate a 1D Mesh 1D Extrusion with rotation into 2D mesh Mesh Part deactivation Check mesh quality
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Mesh Parameters Exposition to Knowledge
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You can use Knowledge in FMS Product to allow for the parameterization of the FEM modeling process.
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Mesh Parameters Exposition to Knowledge (1/4) In FMS parameter value field, display contextual menu: you can Edit Formula. FMS parameters are available to create rules, design tables. All meshing parameters (local and global specifications) are available as knowledge parameters. You can use Knowledge in FMS Product to allow for the parameterization of the FEM modeling process. Following example shows how to link local nodes distribution to the global mesh size parameter Local and global mesh sizes linked by a 2. ratio
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Local mesh distribution on edge
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Mesh Parameters Exposition to Knowledge (2/4) Example of mesh parameters leaded by geometry Global mesh size and a domain mesh size are calculated from a geometrical dimension
Use of formulas
Example of mesh parameters leaded by other mesh parameters Topology simplification depend on global mesh size
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Use of a rule
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Mesh Parameters Exposition to Knowledge (3/4) Example of mesh specifications ruled by geometry Ignore holes specification depends on the distance between holes pattern.
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Use of a rule
The distance between holes is upper than a given distance : holes are taken into account while meshing
The distance between holes is lower than a given distance : holes are not taken into account while meshing
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Mesh Parameters Exposition to Knowledge (4/4) Example of Mesh parameters and specifications valuated by a table and ruled by analysis type configurations. Some mesh parameters and specifications are stored in a table and their values are defined for different configurations.
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Use of a design table
The mesh parameters depend on the selected configuration
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Recap Exercises Mesh Parameters Exposition to Knowledge 30 min
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Mesh Parameters Exposition to Knowledge 1 Mesh Parameters Exposition to Knowledge 2 Mesh Parameters Exposition to Knowledge 3
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Recap Exercise Mesh Parameters Exposition to Knowledge 1 15 min
These exercises require Knowledge Advisor (KWA) and Sheetmetal Design (SMD) License.
In this exercise you will create a Parameterisation of a FEM Model using rules and formulas and see how the Mesh will be modified, according to the geometry modifications.
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In this exercise you will use : Knowledge tools Formula Rule
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Recap Exercise Mesh Parameters Exposition to Knowledge 2 10 min
In this exercise you will see how the Mesh will be modified, according to the values set in a Design Table. In this exercise you will use :
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Rules
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Recap Exercise Mesh Parameters Exposition to Knowledge 3 5 min
In this exercise you will create a Parameterisation of a FEM Model using Design table in the Analysis file. In this exercise you will use :
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Design Table
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Mesh Update
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You will see how to update mesh when part get modified.
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Edit an Existing Advanced Surface Mesh-part You can edit an existing advanced surface meshpart and recover all data : Specifications Geometry simplifications (automatic and manual simplifications) Mesh (automatic and manual)
When you Double-click on a meshed part (in the tree or directly on the geometry). The following window appears :
Click NO : you will recover all data without mesh.
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Click YES : you will recover all data with mesh.
Imposed nodes Access to all Modifications mesh tools
Access to all Specification mesh tools. Need to remesh.
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How to Update Mesh While in your CATAnalysis Document you can perform Design Modifications and then Update your previous mesh. 1
Double-clicking on the referenced part in the specification tree in order to enter in the part design Workbench.
2
Modify the geometry.
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Modified section
3
Update the geometry.
4
Right Click on Advanced Surface Mesh.1. Choose Update Mesh
Note that all your parameters and specifications have been kept.
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Mesh Analysis Tools
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You will study the tools to visualize generated mesh and analyze the quality of mesh.
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What is Cutting Plane You can use cutting plane analysis to take section of meshed part to inspect elements generated within part. You can select « Exact/approximate cutting plane » icon You can select the normal of which the direction is the X, Y or Z axis Reverse : Lets you reverse the cutting part
If this option is activated, you can cut the mesh exactly where you drag the cursor. If this option is not activated, the cutting follows the mesh elements.
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Select the section and drag the cursor to the desired position.
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What is Elements Orientation
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You can check the orientation of elements Two sided representation: Red: positive side Blue: negative side
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What is Shrink Elements
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Shrink Elements allow to shrink the visualization of 1D, 2D and/or 3D mesh elements. It is possible to save meshed model in shrink state.
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What is Mesh Parts Statistics Allow a quick visualization of the elements quality after a mesh operation or during mesh modifications. Quality information is dynamically updated.
Number and percentage of TRIANGLE elements
Number and percentage of POOR elements
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Number and percentage of BAD elements
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How to Use Free Edges Browser Free edges can be visualized quickly so as to validate the final mesh in terms of compatibility. 1
Click the Free edges visualization icon
2
Check ‘Autofocus’ option
Highlighted free edge Click on Arrow buttons provided to browse through subsets
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3
Highlighted Free Edges
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About Intersections and Interferences Check The Interference check tool enables you to check interferences between two or more mesh parts. With Dynamic check option you can visualize the interference while modifying the mesh. The illustration shows two interpenetrating meshes. The interference check tool highlights the interferences as shown below.
Blue elements : Good elements
Violet elements : interference elements.
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Red elements : intersected elements.
Clearance might be less than the smallest edge element of the mesh
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How to Use Intersections / Interferences Check (1/2) 1
Click ‘Interference Check’ icon
2
Enter a clearance value
3
In Mesh Parts can either select ‘All’ or using ‘Selection’ in dropdown select the desired Mesh Parts
4
Click Apply With dynamic check option on, you can use Re-mesh a domain during the Interferences Check. You can split elements to eliminate an interference. A Warning box prevents you from generating interferences.
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Mesh part selector
Mesh part 2
Blue elements are good elements Red elements are intersected elements Violet elements are interference elements
Mesh part 1
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How to Use Intersections / Interferences Check (2/2) 5
Use Dynamic Check to change mesh during Interference check. You may get above warning message if elements interfere during mesh simplification
6
Select the ‘Autofocus’ option to focus on interference area
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Focus on interference area
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How To Perform Quality Analysis (1/5) You can select the quality parameter you want to enforce in your analysis. 1
Click the “Quality Analysis” icon
2
Select the parameters in the Quality Analysis panel
3
Get information about parameters definitions and thresholds
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Ability to Import/Export quality criteria trough management of “sets” of quality criteria
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How To Perform Quality Analysis (2/5)
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You will see how to perform Single Element Quality Analysis. 1
Click the “Quality Analysis” icon
2
Select the Element Analysis icon in the Quality Analysis panel
3
Select a mesh element
4
Element Analysis is displayed
5
Select other elements to display their analysis
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How To Perform Quality Analysis (3/5) You will see how to visualizeStatistic Curves . 1
Click the “Quality Analysis” icon
3
Select a quality parameter
2
Select the Statistic Curves icon in the Quality Analysis panel
4
Move the mouse on the histogram intervals to get numerical values
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Statistic curves parameters are defined in the Quality Analysis panel
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How To Perform Quality Analysis (4/5) You will see how to use Worst Element Searcher. Click the “Quality Analysis” icon
2
Click the Worst Element Searcher icon
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1
Get Single Analyze window
Search other bad elements
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How To Perform Quality Analysis (5/5) You will see how to create a Quality Analysis Report. 1
Click the “Quality Analysis” icon and click Quality Report icon
2
Data are available for Quality parameters and Number of nodes, elements and Elements types
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You can have one analysis panel for each selected Mesh part : click right on a Mesh part and choose Analyse.
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How to Use Standard and Quality Visualization Two visualization modes are available : standard and quality. Standard visualization mode is activated clicking the “standard visualization” icon in the Mesh Analysis Tools toolbar.
2
Quality visulization mode is activated clicking the “quality visualization” icon in the Mesh Analysis Tools toolbar.
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1
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What is Null Size Bar Element Quality Checker Null size bar elements (NSBAR) are elements having ideally coincident nodes. In many cases Null Size Bar elements are created when connection mesh is generated. You can analyze the quality of null size connection bar elements. A new quality criterian called “Maximal Gap” is implemented to measure the maximal gap between the extremity nodes of the NSBAR element. This criterion is computed only for NSBAR elements. This criteria helps to improve mesh reliability with an additional quality check. It is possible to visualize the quality of NSBAR elements with the “Quality Visualization” mode.
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Analyze an Element window
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What is Duplicate Element Checker With Duplicate Element Checker you can identify duplicate elements in a mesh. Duplicate elements are elements sharing exactly the same nodes. In order to localize easily duplicate elements, an ‘Autofocus’ will be available. You can export the duplicate elements data using ‘Export Duplicate subsets’
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‘Show Infos’ provide element and mesh part information.
Duplicate elements are highlighted in red color and other elements will be visualized in green color.
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What is Duplicate Nodes Checker You can visualize the duplicate nodes and their linked elements. In order to localize easily duplicate nodes, an auto-focus is available. You will enter the clear value and click Apply button to get duplicate nodes. Elements with duplicate Nodes are highlighted
‘Autofocus’ shows current duplicate Node highlighted with Red sphere Export button creates html file that contains all the duplicate subsets information
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‘Show infos’ displays information regarding highlighted duplicate Node
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How to Use Unmeshed Domain Browser In meshing process of a complex part, some domains are not meshed. You can use ‘Browse Unmeshed Domain’ to indicate how many unmeshed domains are remaining and shows them with Autofocus option. 1
Click on the ‘Browse Unmeshed Domain’ icon
2
Check ‘Autofocus’ option
This text box shows total number of Unmeshed Domains
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This text box shows highlighted Unmeshed Domain
3
Click on Arrow buttons provided to browse through subsets
Highlighted Unmeshed Domain is shown in red color boundary
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What is Group Definition by Boundary (1/2) This functionality offers two new groups to be created : Line Group by Boundary Surface Group by Boundary
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Line Group by Boundary allows you to form group of portion of line which is bounded by either point or line. Line Group by Boundary will include nodes and 1D elements.
It is necessary to constrain the points or edges which are selected as boundary.
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What is Group Definition by Boundary (2/2)
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Surface Group by Boundary allows you to form a group of portion of surface which is bounded by curves. Surface Group by Boundary will include nodes and 2D elements.
It is necessary to constrain the points or edges which are selected as boundary.
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Visualization of Meshes and Groups You can visualize both the mesh and the contents of a group (elements included in a group). The default visualization type is the visualization by mesh parts, that means you can see only mesh of mesh parts. You can activate or deactivate the group visualization in the same way as the mesh part visualization. Groups visualization particularly lets you see groups you have created. You can hide or show the group. Similarly you can modify the graphics properties of a particular group. Visualization by Mesh Parts
Visualization by groups
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The two Groups created by using Surface Group by Boundary
To visualize the result of a group, the group must be updated. Each time you modify a group you have to update it to visualize the correct results of a group.
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How to Visualize Meshes and Groups The default visualization type is the visualization by mesh parts.
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1
Click Visualization by Groups icon. You will visualize the elements under the groups.
2
Click Visualization by Mesh Parts icon. You will visualize all nodes and elements under Mesh parts only.
Elements under the group
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FEM Surface
Meshing Parametric Conceptual Body Recap Exercise 60 min
In this exercise you will perform a shell meshing on a conceptual body, update it after design modification and perform a quality analysis. In this exercise you will :
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Visualize Static Pre-Processing Elements on Mesh Define meshing specifications Perform geometric modifications and update the mesh Analyse elements quality Modify the mesh
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Import / Export Meshes
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In this lesson, you will learn how to import or export meshes
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What is Import/ Export Mesh You can import or export a NASTRAN Bulk Data file. Supported elements : CTRIA3, CTRIA6, CQUAD4, CQUAD8 CTETRA, CPENTA, CHEXA CBAR, CBEAM, RBE2
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Multi-selection is now available
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Welding Connections
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In this lesson, you will learn how to define connections between mesh parts
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What is Analysis Connection
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Ability to define connections between geometries/meshparts It could be a general, a point, a line, a surface or a points connection. It is created between two parts (geometries or mesh parts) or with itself
For more information, refer to Generative Assembly Structural Analysis (GAS) training
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Welding Meshing Methods - Toolbars General Analysis Connection
Point Analysis Connection
General Analysis Connection
Point Analysis Connection
Point Analysis Connection
Point Analysis Connection within one Part
Line Analysis Connection Surface Analysis Connection
Line Analysis Connection
Points Analysis connection
Line Analysis Connection Line Analysis Connection within one Part
Welding Meshing Methods Spot Welding Connection Mesh
Surface Analysis Connection
Seam Welding Connection Mesh
Surface Analysis Connection
Surface Welding Connection Mesh
Surface Analysis Connection within one Part
Nodes to Nodes Connection Mesh
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Node Interface Mesh
Points Analysis Supports Points to Points Analysis Connection Points Analysis Interface
Welding Meshing Methods are equivalent to corresponding Welding Connection Properties in GAS. Once required Analysis Connection is available for support, you can either use corresponding Welding Connection Property in GAS or Welding Meshing Methods in FMS.
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How to Create Spot Weld Connection Mesh (1/3) You can mesh spot welds in FMS using multi-selection and customization of their modeling. 1
Click the “Spot Weld Connection Mesh” Icon
2
Select the Spot Welding Analysis Connections in the features tree with multi-selection.
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Ability to generate finite element modeling directly from weld design information as for Analysis Connections
Ability to define a weld spot on one part: welding a part with itself ( applied on a ‘Point analysis connection within one part’)
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How to Create Spot Weld Connection Mesh (2/3)
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3
Beam
Choose the welds modeling
Rigid
Rigid/Spring/Rigid
Spring/Rigid/Spring
Hexahedron
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FEM Surface
How to Create Spot Weld Connection Mesh (3/3)
4
Choose the Mesh compatibility: Connection is created on compatible mesh or non compatible mesh
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5
5- Click OK
All weld points connecting two parts can be defined in the same mesh-part, even if there are lying on different geometries
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FEM Surface
Spot Weld Meshing with Hemming Zone We can mesh in FMS, Spot Welds defined in a Hemming zone. Hemming should be defined in ABF product Available in FMS for Compatible and non-compatible meshes Available in FMS for Beam and hexahedron element
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Example with welds modeled with non compatible beam elements :
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How to Analyze Failed Spot Weld Connection Meshes If CATIA identifies failing welds, It is able to stop creation when an error is detected. It helps user to understand.
Option to stop update if error occurs
2
Auto focus on failing welds
3
Help to the users for problems detection: error message
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How to Create Seam Weld Connection Mesh (1/3) You can mesh Seam welds under FMS, modeled with 1D, shell or hexahedron elements and driven by element size. A weld seam can be defined as 1D feature : bar, beam, contact As 2D element: shell. 1
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3
Click the “Seam Weld Connection Mesh” Icon
2
2- Select the analysis connection or ABF feature
Check Welds modeling
contact
Rigid
shell
Rigid/Spring/Rigid
Hexahedron Spring/Rigid/Spring
Ability to define connection between parts.Ability to define a weld seam on one part: welding a part with itself ( applied on a ‘Line analysis connection within one part’)
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How to Create Seam Weld Connection Mesh (2/3) You can use Compatible Mesh when modeling Seam welds under FMS 4 Available for 1D (beam) and 2D (shell) modeling Choose the Need the following methodology in meshing welded components: Mesh Both components meshes must be constrained by weld compatibility. Both components must have compatible mesh (capture or distribution)
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Welds seams Welds seams used as constraints during parts meshing
Compatible seam mesh with shell elements
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How to Create Seam Weld Connection Mesh (3/3) You can mesh Seam welds under FMS.
5
Enter Maximal gap Step along seam
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Seam width (hexahedron meshing)
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How to Create Surface Weld Connection Mesh You can mesh Surface welds under FMS. Surface connection mesher for adhesive modeling. 1
Click the “Surface Weld Connection Mesh” Icon
2
Select the analysis connection
Enter Maximal gap Step
3
Option to fail for each mismatched weld spot
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How to Create Nodes to Nodes Connection Mesh You can generate Nodes to nodes connection. 2 1
Select the analysis connection
Click the “Nodes to Nodes Connection Mesh” Icon
4 3
3 - Choose connection modeling:Rigid or
Enter Tolerance: distance between nodes to be connected
DoF Equal: to connect only specific degrees of freedom between two matching nodes Option to fail for each mismatched weld spot
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5
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How to Create Node Interface Mesh You can generate Nodes to interface connection. 2 1
3
Select the analysis connection
Click the “Nodes Interface Mesh” Icon
connection modeling: Spring
4
Option to fail for each mismatched weld spot
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Enter Tolerance: distance between point and corresponding node to be connected
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Recap Exercises Welding Connections 285 min
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Spot Welding Analysis Seam Welding Analysis Surface Welding Analysis Compatible Seam Welds Spot Welding With Hemming Fuselage Connection
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Spot Welding Analysis Recap Exercise
GAS License required
60 min
In this exercise you will perform a Spot Welding meshing and static analysis. To do so, you will have to use :
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Analysis connections Mesh Definition Tools Static Analysis Post-processing
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FEM Surface
Seam Welding Analysis Recap Exercise Presentation 60 min
In this exercise you will perform a Seam Welding meshing. To do so, you will have to use :
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Analysis connections Mesh Definition Tools Mesh Seam welds
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Surface Welding Analysis Recap Exercise 60 min
In this exercise you will perform a Surface Welding meshing. To do so, you will have to use :
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Analysis connections Mesh Definition Tools Mesh Surface welds
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Compatible Seam Welds Recap Exercise 30 min
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In this exercise you will : Create Line Analysis Connection Constraint These Lines Create Compatible Seam Weld Mesh
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Spot Welding With Hemming Recap Exercise 15 min
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In this exercise you will : Define Hemming in ABF Product. Mesh all the structure with FMS tools. Create Spot Welds in Hemming Zone, using Non-Compatible Elements.
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Fuselage Connection Recap Exercise 60 min
In this exercise you will learn to connect a fuselage using Points to Points connection and point interface. In this exercise you will :
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Create a Points to Points connection between 2 components Create a Point Interface Mesh connections Modify connection property
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Master Exercises
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Master Exercise : Meshing of a Crossmember Master Exercise : Wing Structure Analysis
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Meshing of a Crossmember Master Exercise Presentation 60 min
In this exercise you will learn to mesh a cross-member with FEM Surface tools. To do so, you will have to use :
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Mesh definition Mesh specifications Mesh modifications Mesh quality
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Design Intent – Meshing of a Cross-member
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Mesh around holes with elements heights specifications Impose elements around filled hole Define mapped mesh on a domain Constrain an edge over a hole Edit a mesh-part Clean holes Dynamic mesh statistics “Quad to tria” conversion Lock a domain Interference check
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Design Process - Meshing of a Cross-member 1 Mesh specifications : Mesh around holes, mapped mesh on a domain 2 Constrain edges and mesh the cross-member 3 Mesh modifications : Clean holes, lock a domain, dynamic mesh statistics
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4 Mesh quality : interference check
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Meshing of a Cross-member Step 1 - Mesh specifications 15 min
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In this step you will : Define mesh specifications. Impose elements around filled hole. Mesh around holes with elements heights specifications. Define a Mapped mesh on a specific domain
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Meshing of a Cross-member Step 2 - Constrain edges and Mesh 15 min
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In this step you will : Constrain an edge over an ignored hole Mesh the part and see elements distributions around holes Check mesh statistics Edit a mesh-part
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211
FEM Surface
Meshing of a Cross-member Step 3 - Mesh Modifications 15 min
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In this step you will : Clean holes Modify mesh manually. Do dynamic mesh statistics. Lock a domain. Quad to tria conversion.
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212
FEM Surface
Meshing of a Cross-member Step 4 - Mesh Quality 15 min
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In this step you will : Check intersections and interferences
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213
FEM Surface
Wing Structure Analysis Recap Exercise Presentation 60 min
In this exercise you will perform a Wing Structure meshing. To do so, you will have to use :
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Mesh definition Mesh specifications
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214
FEM Surface
Design Intent – Wing Structure Analysis
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Ribs meshing. Spars and central box meshing. Skin meshing.
Instructor Notes:
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215
FEM Surface
Design Process - Wing Structure Analysis 1 Ribs meshing
2 Spars and central box meshing
3
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Skins meshing
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216
FEM Surface
Wing Structure Analysis Step 1 - Ribs Meshing 15 min
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In this step you will : mesh the ribs parts
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217
FEM Surface
Wing Structure Analysis Step 2 - Spars and Central Box Meshing 15 min
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In this step you will : Mesh the spars surfaces Remove constraints Apply imposed nodes
Instructor Notes:
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218
FEM Surface
Wing Structure Analysis Step 3 - Skin Mesh 15 min
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In this step you will : Mesh the skins surfaces
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