Shear-induced overaging in a polymer glass
Abstract
A phenomenon recently coined as ``overaging'' implies a slowdown in the collective (slow) relaxation modes of a glass when a transient shear strain is imposed. We are able to reproduce this behavior in simulations of a supercooled polymer melt by imposing instantaneous shear deformations. The increases in relaxation times rise rapidly with deformation, becoming exponential in the plastic regime. This ``overaging'' is distinct from standard aging. We find increases in pressure, bond-orientational order and in the average energy of the inherent structures () of the system, all dependent on the size of the deformation. The observed change in behavior from elastic to plastic deformation suggests a link to the physics of the ``jammed state''
Cite
@article{arxiv.cond-mat/0506737,
title = {Shear-induced overaging in a polymer glass},
author = {Matthew L. Wallace and Bela Joos},
journal= {arXiv preprint arXiv:cond-mat/0506737},
year = {2009}
}
Comments
5 pages including 5 figures