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    STP674

    Degradation and Sudden-Death Models of Fatigue of Graphite/Epoxy Composites

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    Abstract

    A detailed approach to the degradation and sudden-death models of residual strength is presented. The models were used to predict the residual strength of six sets of experimental data of graphite/epoxy composites. The adequacy of these models was investigated with the use of hypothesis testing and through the study of the weakest residual strength specimens. Both models did a good job in predicting mean residual strength but were overly restrictive in predicting the strength of the weakest specimens. The decrease in residual strength was observed to be less for unidirectional composites than for composites of general layup.

    Keywords:

    composite materials, graphite/epoxy composites, residual strength, degradation, sudden-death, statistical analysis


    Author Information:

    Chou, PC
    Billings professor of mechanical engineering and graduate assistant, Drexel University, Philadelphia, Pa.

    Croman, R
    Billings professor of mechanical engineering and graduate assistant, Drexel University, Philadelphia, Pa.


    Committee/Subcommittee: D30.04

    DOI: 10.1520/STP36922S