Abstract
The compressive failure of long fibre composites is tackled as a structural instability that is initiated by plastic microbuckling. A homogenised model is proposed to take into account the fibre initial waviness, the non-linear matrix behaviour and some structural effects. The problem is formulated at the ply scale by using a two-scale displacement field and a specific finite element is developed to reduce the extent of computations. This numerical tool permits us to rapidly determine the failure of various unidirectional ply configurations by use of a maximum load criterion. The results establish the influence of some structural parameters on the compressive failure strains, as has been observed in related experiments. They also explain the high compressive strength achieved under flexural loading.
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