Avalanches in 2D Dislocation Systems: Plastic Yielding Is Not Depinning

P.D. Ispanovity, L. Laurson, M. Zaiser, I. Groma, S. Zapperi, M.J. Alava

Research output: Contribution to journalArticleScientificpeer-review

89 Citations (Scopus)
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Abstract

We study the properties of strain bursts (dislocation avalanches) occurring in two-dimensional discrete dislocation dynamics models under quasistatic stress-controlled loading. Contrary to previous suggestions, the avalanche statistics differ fundamentally from predictions obtained for the depinning of elastic manifolds in quenched random media. Instead, we find an exponent τ=1 of the power-law distribution of slip or released energy, with a cutoff that increases exponentially with the applied stress and diverges with system size at all stresses. These observations demonstrate that the avalanche dynamics of 2D dislocation systems is scale-free at every applied stress and, therefore, cannot be envisaged in terms of critical behavior associated with a depinning transition.
Original languageEnglish
Article number235501
Pages (from-to)1-5
JournalPhysical Review Letters
Volume112
Issue number23
DOIs
Publication statusPublished - 2014
MoE publication typeA1 Journal article-refereed

Keywords

  • avalanches
  • dislocations
  • plastic deformation

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