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* Corresponding author 1 LMSGC - Laboratoire des matériaux et structures du génie civil

Abstract : 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.

keyword : strain constitutive law numerical simulations





Author: Jean-Noël Roux - Gaël Combe -

Source: https://hal.archives-ouvertes.fr/



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