Slip avalanches in crystal plasticity: scaling of the avalanche cutoff

Abstract

Plastic deformation of crystals proceeds through a sequence of intermittent slip avalanches with scale-free (power-law) size distribution. On macroscopic scales, however, plastic flow is known to be smooth and homogeneous. In the present letter we use a recently proposed continuum model of slip avalanches to systematically investigate the nature of the cut-off which truncates scale-free behavior at large avalanche sizes. The dependence of the cut-off on system size, geometry, and driving mode, but also on intrinsic parameters such as the strain hardening rate is established. Implications for the observability of avalanche behavior in microscopic and macroscopic samples are discussed.

arXiv comment12 pages, 4 figures

References in corpus (4)

• Intermittent dislocation flow in viscoplastic deformation
• Fluctuation phenomena in crystal plasticity - a continuum model
• On the critical character of plasticity in metallic single crystals
• Scale-free statistics of plasticity-induced surface steps on KCl single crystals

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