Fluctuation phenomena in crystal plasticity - a continuum model

Michael Zaiser, P. Moretti

Research output: Contribution to journalArticlepeer-review

Abstract

On microscopic and mesoscopic scales, plastic flow of crystals is characterized by large intrinsic fluctuations. Deformation by crystallographic slip occurs in a sequence of intermittent bursts ('slip avalanches') with power-law size distribution. In the spatial domain, these avalanches produce characteristic deformation patterns in the form of slip lines and slip bands which exhibit long-range spatial correlations. We propose a generic continuum model which accounts for randomness in the local stress-strain relationships as well as for long-range internal stresses that arise from the ensuing plastic strain heterogeneities. The model parameters are related to the local dynamics and interactions of lattice dislocations. The model explains experimental observations on slip avalanches as well as the associated slip and surface pattern morphologies. © 2005 IOP Publishing Ltd.
Original languageUndefined/Unknown
Pages (from-to)79-97
Number of pages19
Journal Journal of Statistical Mechanics: Theory and Experiment
DOIs
Publication statusPublished - 2005

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