Weight of. Resin. 39.6. 102.9 few tests. Here is a weight savings of 64.4 grams per square foot of sandwich by using ... structural materials, I decided to evaluate .... building. The failures were all skin buckling on the top side, but the deflection.
Here is a weight savings of 64.4 grams per square foot of sandwich
few tests
s,
s t r u c t u r a l m a t e r i a l s , I decided to
evaluate the common ones by making foam/fabric "sandwiches" and
testing them. Although the tests were made on
standard test equipment, the specimen configurations were not necessarily prepared in accordance with Federal test specifications. This was due to the nature of the material and the time involved. However, the results are very interesting and useful as a means of comparing the materials to each other. The foams, two pound density polystyrene ( s t y r o f o a m ) and polyurethane, were purchased from a local s u p p l y house. These were tested using "skins" of Dynel or #120 glass cloth. This p a r t i c u l a r glass fabric has a weight very close to that of Dynel. The epoxy resin and catalyst used are those supplied by Aircraft Spruce and Specialties Company for Dynel/foam use on the Rand designs. General procedure was to make up 12" x 12" x 1" sandwich panels. Weights were taken on everything, the foam, the dry fabric, and the resin by subtracting the first two after cure. Resin was brushed on the foam, dry cloth put in place, covered with waxed paper and the excess resin "squeegeed" from the surface. The foam weights figured out to be actually 2.12 Ibs. per cubic foot for the polystyrene and 1.77 for the polyurethane. Not exactly 2 pounds, but then not bad. Let's cover the weights first. 32 OCTOBER 1976
Weight of Resin
20.7
148.8 214.0
39.6 102.9
nel is about .014 inches thick and has a very open weave (takes lots of resin to fill the holes) while the 120 weave glass cloth is .004 inches thick and a tight weave.
of the Dyne! on the polystyrene. Only 1.1 grams of the difference is in fabric, the remainder (64.3 grams) is
POLYURETHANE FOAM PANELS
(weight in grams)
San tee, CA 92071
' EV'ERAL recent designs for experimental aircraft have made extensive use of low density rigid plastic foam. Since the vendors will not accept responsibility for them as
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In the last issue of Sport Aviation, I began a discussion on ... As a review, the ... the fabric, you can literally peel off all chemical ..... Dust and dirt in final finish. To.
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A linear dashpot will not be adequate to describe very high shortening velocities. However, our results (Bawa et al., 1976) indicate that the linear aspects of ...
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