Avalanches in 2D dislocation systems without applied stresses. (14th July 2015)

• Record Type: Journal Article
• Authors: Janićević, Sanja; Ovaska, Markus; Alava, Mikko J; Laurson, Lasse
• Is Part Of: Journal of statistical mechanics. (2015:Jul.)
• Publication Date: 2015-07-14
• Subjects: 9 -- 7; 9/020 -- 9/260 -- 7/145; Statistical mechanics -- Periodicals; Mechanics -- Statistical methods -- Periodicals; 530.1305
• DOI: 10.1088/1742-5468/2015/07/P07016
• Languages: English
• ISSNs: 1742-5468

Abstract

Abstract: We study avalanches in two-dimensional ensembles of discrete dislocations subject to zero or small finite constant external stresses. These systems respond to local perturbations by exhibiting bursts of collective dislocation activity characterised by power-law distributions of various measures of sizes and durations of the avalanches. The cut-offs of these distributions diverge with the system size even for zero applied stresses. The avalanches are found to display slow, glass-like relaxation dynamics following the initial excitation, with the average avalanche shape depending on the avalanche duration.