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Towards a numerical model of the compressive strength for long fibre composites. (English) Zbl 0927.74060
Summary: The compressive failure of long fibre composites is tackled as a structural instability that is initiated by plastic microbuckling. We propose a homogenized model to take into account the initial waviness of fibres, the nonlinear 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.

MSC:
74R20 Anelastic fracture and damage
74E30 Composite and mixture properties
74S05 Finite element methods applied to problems in solid mechanics
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