Local Approach to Damage in Elasto-Plastic Metal Matrix Composites

Damage is incorporated along with plastic deformation in this model for the analysis of fiber-reinforced metal matrix composite materials. In the formulation, a micromechanical composite model is used in the sense that the matrix and fiber local con stitutive damage relations are treated separately and then linked to the overall response through a certain homogenization procedure. In this process, two local damage tensors MM and MF are introduced where MM accounts for the damage in the ductile matrix such as nucleation and growth of voids, while the tensor MF reflects the damage in the fibers such as fiber fracture. The problems of debonding and delamination can be conveniently represented by either MM or M F, or a combination of both depending on the extent of complexity that is desired of the final constitutive model.

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