Competition between ASB and void growth assisted shear failure mechanisms: unified modelling and applications
Résumé
Numerous are the engineering problems, including metal forming processes as well as accidental overloads, involving crack initiation and propagation under low stress triaxiality. Yet, whereas the metal fracture under tension dominated loading is quite well understood – resulting mostly from void germination, growth and coalescence –, there remain gaps to fill in the comprehension and description of metal failure under shear dominated loading. Starting from experimental observations, the present work aims at reproducing via a unified model the consequences of two deterioration mechanisms occurring under low and high strain rate shear loadings, respectively, namely void growth induced damage and adiabatic shear banding.