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This paper is concerned with the delayed fracture of composite materials under constant stress. The results of an investigation of the combined effect of an active environment (benzene) and stress on the survival life of an E-glass reinforced epoxy composite material are presented. Through the use of an appropriate failure criterion and representative median log-time to failure values, time-dependent failure surfaces were generated from data obtained when testing in (1) air and (2) benzene for the first quadrant of the stress space. These experimental results are used to extend the current kinetic theory of rate-dependent rupture to include both anisotropic and environmental effects.
composite materials, glass, epoxy resins, creep, stress-rupture, stresses, environments, tension tests, strength, variability, statistics, failure surfaces
Associate professor, Washington University, St. Louis, Mo.
Senior engineer, McDonnell Douglas Astronautics Company-East, St. Louis, Mo.