Dislocations jam at any density

Georgios Tsekenis, Nigel Goldenfeld, Karin A. Dahmen

Research output: Contribution to journalArticle

Abstract

Crystalline materials deform in an intermittent way via dislocation-slip avalanches. Below a critical stress, the dislocations are jammed within their glide plane due to long-range elastic interactions and the material exhibits plastic response, while above this critical stress the dislocations are mobile (the unjammed phase) and the material flows. We use dislocation dynamics and scaling arguments in two dimensions to show that the critical stress grows with the square root of the dislocation density. Consequently, dislocations jam at any density, in contrast with granular materials, which only jam below a critical density.

Original languageEnglish (US)
Article number105501
JournalPhysical review letters
Volume106
Issue number10
DOIs
StatePublished - Mar 8 2011

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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