SYMPOSIA PAPER Published: 01 January 1979

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


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.

Author Information

Chou, PC
Drexel University, Philadelphia, Pa.
Croman, R
Drexel University, Philadelphia, Pa.
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Developed by Committee: D30
Pages: 431–454
DOI: 10.1520/STP36922S
ISBN-EB: 978-0-8031-4743-0
ISBN-13: 978-0-8031-4495-8