Dynamics of Shear-Transformation Zones in Amorphous Plasticity: Energetic Constraints in a Minimal Theory
We use energetic considerations to deduce the form of a previously uncertain coupling term in the shear-transformation-zone (STZ) theory of plastic deformation in amorphous solids. As in the earlier versions of the STZ theory, the onset of steady deformation at a yield stress appears here as an exch...
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Main Authors | , |
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Format | Journal Article |
Language | English |
Published |
01.01.2003
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Subjects | |
Online Access | Get full text |
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Summary: | We use energetic considerations to deduce the form of a previously uncertain
coupling term in the shear-transformation-zone (STZ) theory of plastic
deformation in amorphous solids. As in the earlier versions of the STZ theory,
the onset of steady deformation at a yield stress appears here as an exchange
of dynamic stability between jammed and plastically deforming states. We show
how an especially simple ``quasilinear'' version of this theory accounts
qualitatively for many features of plasticity such as yielding, strain
softening, and strain recovery. We also show that this minimal version of the
theory fails to describe certain other phenomena, and argue that these
limitations indicate needs for additional internal degrees of freedom beyond
those included here. |
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DOI: | 10.48550/arxiv.cond-mat/0301009 |