Non-Linear Phenomenological Models of Fibre-Reinforced Composites
Filamentary composites are usually considered as linearly elastic materials prior to failure. However, the deviation of fibre angles, resin crazing, or plasticity of the matrix may cause substantial nonlinearity of the material. In this paper, phenomenological models which seek to describe some aspects of nonlinear behaviour of filamentary composites are presented. It is assumed that the material consists of a number of orthotropic unidirectional plies and that the properties of each macroscopically homogeneous ply are determined experimentally.
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