Avalanches in 2D dislocation systems

Plastic yielding is not depinning

Péter Dusán Ispánovity, Lasse Laurson, Michael Zaiser, I. Groma, Stefano Zapperi, Mikko J. Alava

Research output: Contribution to journalArticle

69 Citations (Scopus)

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
JournalPhysical Review Letters
Volume112
Issue number23
DOIs
Publication statusPublished - Jun 13 2014

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avalanches
plastic deformation
dynamic models
suggestion
bursts
slip
cut-off
statistics
exponents
predictions
energy

ASJC Scopus subject areas

  • Physics and Astronomy(all)

Cite this

Ispánovity, P. D., Laurson, L., Zaiser, M., Groma, I., Zapperi, S., & Alava, M. J. (2014). Avalanches in 2D dislocation systems: Plastic yielding is not depinning. Physical Review Letters, 112(23), [235501]. https://doi.org/10.1103/PhysRevLett.112.235501

Avalanches in 2D dislocation systems : Plastic yielding is not depinning. / Ispánovity, Péter Dusán; Laurson, Lasse; Zaiser, Michael; Groma, I.; Zapperi, Stefano; Alava, Mikko J.

In: Physical Review Letters, Vol. 112, No. 23, 235501, 13.06.2014.

Research output: Contribution to journalArticle

Ispánovity, PD, Laurson, L, Zaiser, M, Groma, I, Zapperi, S & Alava, MJ 2014, 'Avalanches in 2D dislocation systems: Plastic yielding is not depinning', Physical Review Letters, vol. 112, no. 23, 235501. https://doi.org/10.1103/PhysRevLett.112.235501
Ispánovity, Péter Dusán ; Laurson, Lasse ; Zaiser, Michael ; Groma, I. ; Zapperi, Stefano ; Alava, Mikko J. / Avalanches in 2D dislocation systems : Plastic yielding is not depinning. In: Physical Review Letters. 2014 ; Vol. 112, No. 23.
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