Accession Number : ADA302701

Title :   Experimental Studies of Graphite-Epoxy and Boron-Epoxy Angle Ply Laminates in Compression,

Corporate Author : TECHNION - ISRAEL INST OF TECH HAIFA DEPT OF AERONAUTICAL ENGINEERING

Personal Author(s) : Weller, T.

PDF Url : ADA302701

Report Date : SEP 1977

Pagination or Media Count : 110

Abstract : The present report describes and presents a test program carried out at NASA Langley Research Center aimed at studying the nonlinear/inelastic response under axial compression across a wide range of angle ply 3M SP-286T3 Graphite-Epoxy and AVCO 5505/5.6MIL. DIA. Boron-Epoxy Laminates. The program is also aimed at defining the strength allowables corresponding to the various laminate configurations and detecting the failure mechanisms which dictate their mode of failure. The program involved two types of specimens for each laminate configuration: compression sandwich coupons (planar specimens) and compression tubes. The test results indicate that the coupons perform better than the tubes, displaying considerably high stress-strain allowables and mechanical properties relative to the tubes. Also it is observed that depending on their dimensions the coupons are susceptible to very pronounced edge effects. This 'sensitivity' results in assigning to the laminate 'conservative' mechanical properties rather than the actual ones. (MM)

Descriptors :   *EPOXY LAMINATES, *BORON, *GRAPHITE EPOXY COMPOSITES, COMPRESSION, STRESS STRAIN RELATIONS, ISRAEL, MECHANICAL PROPERTIES, SPACECRAFT, AIRCRAFT, LAMINATES, STRENGTH(MECHANICS), PLANAR STRUCTURES, EPOXY COMPOSITES, FAILURE(MECHANICS), RIGIDITY.

Subject Categories : Laminates and Composite Materials
      Research and Experimental Aircraft

Distribution Statement : APPROVED FOR PUBLIC RELEASE