Dynamical Correlations near Dislocation Jamming

L. Laurson, M.C. Miguel, M.J. Alava

Research output: Contribution to journalArticleScientificpeer-review

27 Citations (Scopus)
108 Downloads (Pure)

Abstract

Dislocation assemblies exhibit a jamming or yielding transition at a critical external shear stress value σ=σc. Here we study the heterogeneous and collective nature of dislocation dynamics within a crystal plasticity model close to σc, by considering the first-passage properties of the dislocation dynamics. As the transition is approached in the moving phase, the first-passage time distribution exhibits scaling, and a related peak dynamical susceptibility χ∗4 diverges as χ∗4∼(σ−σc)−α, with α≈1.1. We relate this scaling to an avalanche description of the dynamics. While the static structural correlations are found to be independent of the external stress, we identify a diverging dynamical correlation length ξy in the direction perpendicular to the dislocation glide motion.
Original languageEnglish
Article number015501
Pages (from-to)1-4
JournalPhysical Review Letters
Volume105
Issue number1
DOIs
Publication statusPublished - 2010
MoE publication typeA1 Journal article-refereed

Keywords

  • plasticity

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