Atomic-scale mechanism of crack-tip plasticity: Dislocation nucleation and crack-tip shielding

Fabrizio Cleri, Sidney Yip, Dieter Wolf, Simon R. Phillpot

Research output: Contribution to journalArticle

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By isolating the process of dislocation emission from a crack tip under an applied tensile stress, we extract from a molecular dynamics simulation the atomic-level displacement and stress fields on the activated slip plane before and after the nucleation event. The stress-displacement relations so obtained provide a direct link with recent continuum descriptions of brittle versus ductile behavior in crack propagation. Crack-tip shielding by the emitted dislocations is demonstrated, as is the role of surface steps in dislocation nucleation and crack-tip blunting. © 1997 The American Physical Society.
Original languageEnglish
Pages (from-to)1309 - 1312
Number of pages4
JournalPhysical Review Letters
Issue number7
Publication statusPublished - 1 Jan 1997
Externally publishedYes


All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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