Accession Number : AD0763760

Title :   Fatigue Properties of Graphite/Glass/Epoxy Composites.

Descriptive Note : Final rept. 9 Feb 72-9 Feb 73,

Corporate Author : IIT RESEARCH INST CHICAGO ILL

Personal Author(s) : Rao,Nagaraja ; Hofer,K. E. , Jr

Report Date : APR 1973

Pagination or Media Count : 137

Abstract : Two ternary composite material systems, PR 286/Modmor II/Graphite/S-Glass and PR 286/ HMS Graphite/S-Glass, involving two types of lamination fabrications, namely uniformly distributed interply hybrids and core-shell hybrids, were investigated. The test program included static tests, tensile fatigue tests, shear fatigue tests, modulus degradation studies and microscopic examination. The study shows that hybrid composites perform generally satisfactorily in fatigue and will survive rigorous stress cycling. Distributed interply hybrids show a better mechanical performance than core- shell hybrids. The mechanical behavior of hybrid composites generally follows the rule of mixtures and the rule of mixtures can be used to predict elastic moduli of hybrids. The performance (as a percentage of the fatigue strength at any given life) of 1:1 graphite/glass/epoxy relative to pure HMS GRAPHITE IS BETTER THAN THAT OF 1:1 HTS Graphite/glass/epoxy relative to pure HTS GRAPHITE/EPOXY. (Author, modified-PL)

Descriptors :   (*REINFORCED PLASTICS, FATIGUE(MECHANICS)), CARBON FIBERS, GLASS TEXTILES, EPOXY RESINS, COMPOSITE MATERIALS, TENSILE PROPERTIES, LAMINATES

Subject Categories : Laminates and Composite Materials

Distribution Statement : APPROVED FOR PUBLIC RELEASE