Nonlinear Strain Theory of Plastic Flow in Solids

Details Nonlinear Strain Theory of Plastic Flow in Solids Nonlinear Strain Theory of Plastic Flow in Solids

2002-10-08

arxiv.org/abs/cond-mat/0210151v3

Physics

Condensed Matter

Soft Condensed Matter

10pages, 7figures

Scientific paper

10.1088/0953-8984/15/11/313

We present a phenomenological time-dependent Ginzburg-Landau theory of nonlinear plastic deformations in solids. Because the problem is very complex, we first give models in one and two dimensions without vacancies and interstitials, where large strains produce densely distributed slips but the mass density deviations remain small except near the tips of slips. Next we set up a two-dimensional model including a vacancy field (or local free-volume fraction), where relevant is the sensitive dependence of the elastic shear modulus on the vacancy density. In our simulation, if strains are applied to nearly defectless solids but in the presence of such elastic inhomogeneity, the vacancy density and the mass density can become considerably heterogeneous for large strains on spatial scales much longer than the atomic size. These strain-induced disordered states are metastable or long-lived once they are created.

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