Fronts Propagation at the Onset of Plastic Yielding

Details Fronts Propagation at the Onset of Plastic Yielding Fronts Propagation at the Onset of Plastic Yielding

2007-07-31

arxiv.org/abs/0707.4573v3

Phys. Rev. E 78, 026119 (2008)

Physics

Condensed Matter

Materials Science

6 pages, 1 figure; reorganized paper, friction part omitted

Scientific paper

10.1103/PhysRevE.78.026119

The existence of a finite threshold, the yield stress, for the onset of plastic yielding is a universal feature of plasticity. This jamming-unjamming transition is naturally accounted for by the dynamics of a bistable internal state field. We show, within the athermal Shear Transformation Zones (STZ) theory of amorphous plasticity, that the transition is accompanied by the propagation of plastic fronts. We further show that the mean-field theory cannot select the velocity of these fronts and go beyond the mean-field description to include fluctuations and correlations effects, resulting in new nonlocal terms in the equations. Finally, we demonstrate that the new terms, with an associated intrinsic lengthscale, provide a velocity selection mechanism for the plastic fronts.

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