Abstract
A computer program for handling non-proportional loading in First Ply Failure analyses of layered fiber reinforced composites is developed. To this end, stresses are split up into a constant and a variable part, such that for the latter the assumption of proportional increase of stress components is valid. The risk of failure is assessed in terms of a stress based failure envelope and four risk parameters, which are defined as linear combinations of the constant and variable stress contributions. Amongst others, the Puck failure criteria for plane and three-axial stress states are implemented for stress assessment. By hooking the program up onto a Finite Element package as a post-processing tool, it can be utilized in structural failure analysis. The approach is used to study the effect of residual ply stresses on the failure behavior of a typical laminated structure under complex loading.
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