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Elastic properties and fracture strength of quasi-isotropic graphite/epoxy compositesA research program is described which was devised to determine experimentally the elastic properties in tension and bending of quasi-isotropic laminates made from high-modulus graphite fiber and epoxy. Four laminate configurations were investigated, and determinations were made of the tensile modulus, Poisson's ratio, bending stiffness, fracture strength, and fracture strain. The measured properties are compared with those predicted by laminate theory, reasons for scatter in the experimental data are discussed, and the effect of fiber misalignment on predicted elastic tensile properties is examined. The results strongly suggest that fiber misalignment in combination with variation in fiber volume content is responsible for the scatter in both elastic constants and fracture strength.
Document ID
19770038767
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Sullivan, T. L.
(NASA Lewis Research Center Cleveland, Ohio, United States)
Date Acquired
August 9, 2013
Publication Date
January 1, 1977
Subject Category
Composite Materials
Meeting Information
Meeting: Conference on Composites and Advanced Materials
Location: Cocoa Beach, FL
Start Date: January 17, 1977
End Date: January 19, 1977
Sponsors: American Ceramic Society
Accession Number
77A21619
Distribution Limits
Public
Copyright
Other

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