Development of a Compression Testing Method for Graphite/Epoxy Coupons.
MASSACHUSETTS INST OF TECH CAMBRIDGE TECHNOLOGY LAB FOR ADVANCED COMPOSITES
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The purpose of this investigation was to develop a method of testing the standard TELAC Technology Laboratory for Advanced Composites graphiteepoxy coupon directly in compression. Since thin coupons buckle under compressive loads, a compression jig was needed to support the coupon and prevent it from buckling. The most successful design for a compression jig was a set of 300 steel balls that are pressed onto both sides of the coupon. These 14 inch diameter steel balls are free to rotate insuring that no shear load is applied to the coupon. These steel balls are housed in two steel plates, one for each side of the coupon. An Aluminum cage bolted onto each plate holds the balls onto the plate. Preliminary tests indicate that this compression jig could provide valid test results.
- Laminates and Composite Materials