Reversible plasticity in amorphous materials

Details Reversible plasticity in amorphous materials Reversible plasticity in amorphous materials

2007-07-26

arxiv.org/abs/0707.4014v2

Phys. Rev. E 77, 041505 (2008)

Physics

Condensed Matter

Soft Condensed Matter

Revised paper

Scientific paper

10.1103/PhysRevE.77.041505

A fundamental assumption in our understanding of material rheology is that when microscopic deformations are reversible, the material responds elastically to external loads. Plasticity, i.e. dissipative and irreversible macroscopic changes in a material, is assumed to be the consequence of irreversible microscopic events. Here we show direct evidence for reversible plastic events at the microscopic scale in both experiments and simulations of two-dimensional foam. In the simulations, we demonstrate a link between reversible plastic rearrangement events and pathways in the potential energy landscape of the system. These findings represent a fundamental change in our understanding of materials--microscopic reversibility does not necessarily imply elasticity.

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