Markov chain models for life prediction of composite laminates

The results of an experimental program to verify a recently proposed stochastic damage accumulation model for symmetric composite laminates subjected to fatigue loading are presented and used to support the development of a life prediction model. The model is based on the application of nonstationary Markov chains to the “critical element” approach for life prediction of composites. It is a hybrid strength/stiffness degradation model which utilizes basic probability-stress-life information (P-S-N curves) in conjunction with the evolutionary distribution of stresses on the critical load bearing plies of a laminate to determine the evolutionary probability of failure of a laminate. The applicability of the life prediction model is demonstrated through a numerical example.