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

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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date

2014

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Department of Applied Physics

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Language

en

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Physical Review Letters, Volume 112, issue 23, pp. 1-5

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.

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Keywords

avalanches, dislocations, plastic deformation

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DOI

10.1103/PhysRevLett.112.235501

Citation

Ispanovity, 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, vol. 112, no. 23, 235501, pp. 1-5. https://doi.org/10.1103/PhysRevLett.112.235501

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https://urn.fi/URN:NBN:fi:aalto-202510088132

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[article-cris] Perustieteiden korkeakoulu / SCI