EFFECTIVE PROPERTIES OF POROUS IDEALLY PLASTIC OR VISCOPLASTIC MATERIALS CONTAINING RIGID PARTICLES

This study deals with the overall yield surface of porous materials co ntaining rigid inclusions and governed by a generalized Gurson model. The dissipation potential of these voided materials can be obtained in a closed form. An estimate for the effective dissipation potential of the composite is derived in terms of the strain energy of a linear co mparison solid. The corresponding yield surface is described by a gene ralized Gurson criterion. These results are extended to voided viscous matrices. The accuracy of the analytical estimates is assessed by com parison with cell calculations performed by the finite element method. (C) 1997 Elsevier Science Ltd.