Shear Fatigue Test and Life Prediction of Composite Laminates

摘要

A cumulative damage model, which is able to consider the influence of in plane bi-axial stresses and mean stresses on the fatigue behavior of unidirectional laminates, was used to evaluate the fatigue lives of multidirectional laminates under cyclic shear loadings, with the least requirement for the S-N curves of unidirectional laminates corresponding to the three in-plane on-axis stress components separately. An Iosipescu-type of fixture, which had been previously used for the static shear strength tests of unidirectional laminates or metal materials, was proved useful for the shear fatigue tests of multidirectional laminates. Together with finite element stress analysis, cumulative damage modes and their distribution regions on T300/QY8911 shear fatigue specimens were reasonably simulated and the predicted lives agree well with the test results.