Micromechanical finite element analysis of metal matrix composites using nonlocal ductile failure models

摘要

Finite element studies of ductile damage in the matrix of particle and fiber reinforced metal matrix composites are presented. Three material models capable of supporting such simulations at the constituent level are discussed within a unified framework. They comprise an element removal technique triggered by a ductile damage indicator as well as versions of the ductile rupture models of Gurson and Rousselier. Nonlocal averaging is employed for reducing the mesh dependence typically displayed by continuum damage methods upon the onset of local softening. Implementation issues specific to the use of nonlocal damage models in a continuum micromechanics framework are discussed.