Multiaxial fatigue behaviour of unidirectional plies based on uniaxial fatigue experiments — I. Modelling - ScienceDirect

International Journal of Fatigue

Volume 19, Issue 3, March 1997, Pages 201-207

International Journal of Fatigue

https://doi.org/10.1016/S0142-1123(96)00074-6 Get rights and content

Abstract

The fatigue behaviour of a unidirectional composite lamina is examined from theoretical and experimental viewpoints. The goal is to establish a technique to use experimental data from a unidirectional ply under uniaxial fatigue to simulate the behaviour of that ply in multiaxial fatigue loading. Traditional polynomial failure criteria for fatigue are of limited use because fatigue strength is a function of number of cycles and applied fatigue stress ratio. In practice, a problem such as a fatigue-loaded complex composite structure containing stress concentrations, is subjected to varying stress ratios at different points, especially if material or geometric nonlinearities are involved. However, fatigue testing under a wide range of stress ratios is time consuming and expensive. Therefore it is important to establish a technique to consider fatigue damage due to arbitrary stress ratio without having to perform excessive amounts of testing. Here the theoretical basis of a new model, called the generalized residual material property degradation model is explained in detail.

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Copyright © 1997 Published by Elsevier Ltd.

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