Fluctuation phenomena in crystal plasticity - a continuum model

Details Fluctuation phenomena in crystal plasticity - a continuum model Fluctuation phenomena in crystal plasticity - a continuum model

2005-05-24

arxiv.org/abs/cond-mat/0505593v1

Physics

Condensed Matter

Materials Science

Scientific paper

10.1088/1742-5468/2005/08/P08004

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.

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