Quasistatic rheology and the origins of strain

Details Quasistatic rheology and the origins of strain Quasistatic rheology and the origins of strain

2009-01-19

arxiv.org/abs/0901.2846v1

Comptes-Rendus Physique 3, 2 (2002) pp. 131-140

Physics

Condensed Matter

Materials Science

Published in special issue of "Comptes-Rendus Physique" on granular materials

Scientific paper

10.1016/S1631-0705(02)01306-3

Features of rheological laws applied to solid-like granular materials are recalled and confronted to microscopic approaches via discrete numerical simulations. We give examples of model systems with very similar equilibrium stress transport properties -- the much-studied force chains and force distribution -- but qualitatively different strain responses to stress increments. Results on the stability of elastoplastic contact networks lead to the definition of two different rheological regimes, according to whether a macroscopic fragility property (propensity to rearrange under arbitrary small stress increments in the thermodynamic limit) applies. Possible consequences are discussed.

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