Abstract
Focusing on isotropic elastic networks we propose a simple-average expression for the computational determination of the shear-stress relaxation modulus of a classical elastic solid or fluid. Here, characterizes the shear transformation of the system at and the (rescaled) mean-square displacement of the instantaneous shear stress as a function of time . We discuss sampling time and ensemble effects and emphasize possible pitfalls of alternative expressions using the shear-stress autocorrelation function. We argue finally that our key relation may be readily adapted for more general linear response functions.
- Received 2 October 2015
- Revised 10 December 2015
DOI:https://doi.org/10.1103/PhysRevE.93.012103
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