Asymptotic analysis of pore crack initiation near a free edge

The matched asymptotic (MA) approach of the coupled criterion (CC) enables studying crack initiation at a pore located near free edge, which leads to competition between three possible mechanisms, namely in ligament, side opposite edge or simultaneously both sides. mechanism that is most likely occur depends on pore-to-free ligament size and material characteristic length diameter ratio. Simultaneous initiations sides for large enough size. For smaller sizes, unilateral more occur, within small ratios otherwise. CC MA estimating remote imposed stress as well length.