Abstract
A simple three-dimensional plasticity model has been developed to describe the plastic response of unidirectional composite materials. The orthotropic parameters in the model were determined from the stress/strain responses of composites subjected to various experimental loading conditions. The plasticity models for several composite materials were obtained, the stress/strain responses under various loadings being generated by a micromechanics analysis instead of real experiments. A three-dimensional finite element analysis employing the plasticity model was used to model compression and short-beam shear tests of composite materials to demonstrate the application of the model.
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