期刊
PHYSICAL REVIEW LETTERS
卷 112, 期 23, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.112.235501
关键词
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资金
- Hungarian Scientific and Research Fund [OTKA-PD-105256, OTKA-K-105335]
- European Commission [MC-CIG-321842]
- Academy of Finland through a Postdoctoral Researcher's Project [139132]
- Academy Research Fellowship [268302]
- Centres of Excellence Program [251748, 261262, 261521]
- European Research Council [AdG2001-SIZEFFECTS]
- Academy of Finland (AKA) [139132] Funding Source: Academy of Finland (AKA)
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 tau = 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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