Mechanical Properties of Glass Forming Systems

Details Mechanical Properties of Glass Forming Systems Mechanical Properties of Glass Forming Systems

2007-05-13

arxiv.org/abs/0705.1834v1

Physics

Condensed Matter

Statistical Mechanics

Scientific paper

10.1103/PhysRevE.76.052401

We address the interesting temperature range of a glass forming system where the mechanical properties are intermediate between those of a liquid and a solid. We employ an efficient Monte-Carlo method to calculate the elastic moduli, and show that in this range of temperatures the moduli are finite for short times and vanish for long times, where `short' and `long' depend on the temperature. By invoking some exact results from statistical mechanics we offer an alternative method to compute shear moduli using Molecular Dynamics simulations, and compare those to the Monte-Carlo method. The final conclusion is that these systems are not "viscous fluids" in the usual sense, as their actual time-dependence concatenates solid-like materials with varying local shear moduli.

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