Time Scales in the Theory of Elasto-Plasticity of Amorphous Solids

Details Time Scales in the Theory of Elasto-Plasticity of Amorphous Solids Time Scales in the Theory of Elasto-Plasticity of Amorphous Solids

2009-11-24

arxiv.org/abs/0911.4646v1

Physics

Condensed Matter

Statistical Mechanics

5 pages, 4 figures

Scientific paper

Developing a macroscopic theory of elasto-plasticity in amorphous solids calls for (i) identifying the relevant macro state-variables and (ii) discriminating the different time-scales which characterize these variables. In current theories it is assumed that the stress reaches its elasto-plastic steady state value on the same time-scale as the configurational variables (be they the configurational energy, configurational entropy or the effective temperature). By examining numerical simulations in two and three dimensions we show that this is generally not the case, the configurational degrees of freedom may reach the elasto-plastic steady state on the time scales which can be very different from the time scale of the stress. We provide a physical discussion to rationalize these findings.

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