Crack blunting effects on dislocation emission from cracks

S. J. Zhou, A. E. Carlsson, Robb Thomson

Research output: Contribution to journalArticlepeer-review

133 Scopus citations


A series of atomistic calculations is performed in order to establish criteria for dislocation emission from cracks in a model hexagonal lattice. We find that except for special orientations, additional tensile broken-bond effects must be added to existing theories based on shear effects, in order to correctly estimate the critical stress intensity Ke required for dislocation emission. From this, a new ductility criterion for materials is proposed which does not depend on the intrinsic surface energy, but contains only the unstable stacking fault parameter.

Original languageEnglish
Pages (from-to)852-855
Number of pages4
JournalPhysical Review Letters
Issue number6
StatePublished - 1994


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