Activated dynamics and effective temperature in a steady state sheared glass

Thomas K. Haxton; Andrea J. Liu

doi:10.1103/PhysRevLett.99.195701

paper

Activated dynamics and effective temperature in a steady state sheared glass

arXiv:0706.0235 · doi:10.1103/PhysRevLett.99.195701

Abstract

We conduct nonequilibrium molecular dynamics simulations to measure the shear stress, the average inherent structure energy, and the effective temperature $T_{e f f}$ of a sheared model glass as a function of bath temperature $T$ and shear strain rate. For $T$ above the glass transition temperature $T_{0}$ , the rheology approaches a Newtonian limit and $T_{e f f}$ approaches $T$ as the strain rate approaches zero, while for $T < T_{0}$ , the shear stress approaches a yield stress and $T_{e f f}$ approaches a limiting value near $T_{0}$ . In the shear-dominated regime at high $T$ , high strain rate or at low $T$ , we find that the shear stress and the average inherent structure energy each collapse onto a single curve as a function of $T_{e f f}$ . This indicates that $T_{e f f}$ is controlling behavior in this regime.

4 pages, 2 figures. Revised to include additional data. Inherent structure energy results were included, and much of the shear transformation zone discussion was removed

Activated dynamics and effective temperature in a steady state sheared glass

Abstract

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