Predictions of mixed mode interface crack growth using a cohesive zone model for ductile fracture

Special interface elements that account for ductile failure by the nucleation and growth of voids to coalescence are used to analyse crack growth. In these elements the stress component tangential to the interface is accounted for, as determined by the requirement of compatibility with the surrounding material in the tangential direction. Thus, the present interface description incorporates the important effect of stress triaxiality on damage evolution, which is not part of the usual cohesive zone models. The interface elements have been used previously for mode I loading conditions, but are here extended to cover non-symmetric mixed mode loading conditions for crack growth along an interface between dissimilar elastic-plastic solids. Crack growth resistance curves are calculated, and the dependence of the interface fracture toughness on the degree of mode mixity is studied. (C) 2003 Elsevier Ltd. All rights reserved.