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A residual strength degradation model is presented which deals with both tensile and compressive strength degradation as competing failure modes. Static strength distributions are assumed to follow a two-parameter lognormal distribution, whereas the residual strength degradation equations are based on a three-parameter power law model. A procedure is outlined for determining the parameters in the model. Comparisons are made between theory and experiment for constant amplitude tension-tension and tension-compression fatigue data. Both residual tensile and residual compressive data obtained under these two load histories are considered.
composite materials, strength degradation model, residual strength, composite fatigue, composites
Materials research engineer, Nonmetallic Materials Division, Materials Laboratory, Air Force Wright Aeronautical Laboratories, Wright-Patterson Air Force Base, OH