Ageing and Rheology in Soft Materials

Details Ageing and Rheology in Soft Materials Ageing and Rheology in Soft Materials

1999-07-07

arxiv.org/abs/cond-mat/9907101v1

Journal of Rheology 44 (2000) 323-369.

Physics

Condensed Matter

Soft Condensed Matter

54 pages, 14 postscript figures included

Scientific paper

10.1122/1.551088

We study theoretically the role of ageing in the rheology of soft materials. We define several generalized rheological response functions suited to ageing samples (in which time translation invariance is lost). These are then used to study ageing effects within a simple scalar model (the "soft glassy rheology" or SGR model) whose constitutive equations relate shear stress to shear strain among a set of elastic elements, with distributed yield thresholds, undergoing activated dynamics governed by a "noise temperature", $x$. (Between yields, each element follows affinely the applied shear.) For $1

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