Fronts Propagation at the Onset of Plastic Yielding

TL;DR

This paper investigates the propagation of plastic fronts at the onset of yielding in amorphous materials, revealing how nonlocal effects and fluctuations influence front velocity selection within the STZ theory.

Contribution

It introduces a nonlocal extension to the mean-field STZ theory that accounts for fluctuations, enabling the selection of plastic front velocities during yielding.

Findings

Plastic fronts propagate at the onset of yielding.

Nonlocal terms with an intrinsic length scale determine front velocity.

Fluctuations and correlations are crucial for velocity selection.

Abstract

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.