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    A Residual Strength Degradation Model for Competing Failure Modes

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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

    Author Information:

    Whitney, JM
    Materials research engineer, Nonmetallic Materials Division, Materials Laboratory, Air Force Wright Aeronautical Laboratories, Wright-Patterson Air Force Base, OH

    Committee/Subcommittee: D30.04

    DOI: 10.1520/STP31825S