An influence of elastic field of strain induced junction disclinations on hardening and
nucleation of a micro-crack in a head of edge lattice dislocations pile-up is considered.
Computer simulation method is used to calculate critical external stress for plastic shear
propagation throw a force barrier induced by junction disclination. A qualitative explanation is
given for the experimentally observed essential growth of the flow stress at sufficiently large
plastic deformations. It is shown that the appearance of junction disclinations suppress
nucleation of micro-cracks according to the mechanism of pile-up head dislocations confluence
proposed by Stroh .
Keywords: strain induced junction disclination, plastic deformation, hardening, crack nucleation
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