Dislocation generation in the two-dimensional Frenkel-Kontorova model at high stresses

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

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Original languageEnglish
Pages (from-to)2702-2705
Journal / PublicationPhysical Review Letters
Volume57
Issue number21
Publication statusPublished - 24 Nov 1986
Externally publishedYes

Abstract

Dislocation generation is studied in a generalized two-dimensional Frenkel-Kontorova model which allows consideration of dislocations of arbitrary Burgers vector and line shape. Two new mechanisms for dislocation generation at high stresses have been found: (1) heterogeneous nucleation of dislocations on preexisting dislocations and (2) generation of dislocation loops in the wake of a moving dislocation. These new mechanisms provide an understanding of how materials generate the density of dislocations required to accommodate arbitrary strains at high strain rates.