Shear yielding of amorphous glassy solids: Effect of temperature and strain rate

Details Shear yielding of amorphous glassy solids: Effect of temperature and strain rate Shear yielding of amorphous glassy solids: Effect of temperature and strain rate

2003-03-14

arxiv.org/abs/cond-mat/0303276v2

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1103/PhysRevE.68.011507

We study shear yielding and steady state flow of glassy materials with molecular dynamics simulations of two standard models: amorphous polymers and bidisperse Lennard-Jones glasses. For a fixed strain rate, the maximum shear yield stress and the steady state flow stress in simple shear both drop linearly with increasing temperature. The dependence on strain rate can be described by a either a logarithm or a power-law added to a constant. In marked contrast to predictions of traditional thermal activation models, the rate dependence is nearly independent of temperature. The relation to more recent models of plastic deformation and glassy rheology is discussed, and the dynamics of particles and stress in small regions is examined in light of these findings.

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