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Some micromechanical aspects of failure in granular materials based on second order work

Abstract : This paper discusses the notion of failure in a granular assembly by examining the key microstructural mechanisms which are most likely to trigger the nucleation and propagation of instabilities within a granular material. For this purpose, the key variable to predict the occurrence of failure, known as second-order work, is expressed from variables on the grain scale. The local behaviour incidents (where contacts may open or slide), compared to the global response of the assembly, are analysed by two approaches. First, numerical computations made by a discrete element model confirm the microscopic definition of the second-order work. Secondly, a micromechanical model, based on a homogenization procedure, relating the macroscopic behaviour to microscopic ingredients, namely contact planes, points to a close link between the occurrence of failure on the macroscopic scale as well as on the contact planes.
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Article dans une revue
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https://hal.univ-grenoble-alpes.fr/hal-01953956
Contributeur : Robert Peyroux <>
Soumis le : jeudi 13 décembre 2018 - 13:21:39
Dernière modification le : mercredi 14 octobre 2020 - 04:08:52

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François Nicot, Nejib Hadda, Luc Sibille, Farhang Radjai, Pierre-Yves Hicher, et al.. Some micromechanical aspects of failure in granular materials based on second order work. Comptes Rendus Mécanique, Elsevier Masson, 2014, 342 (3), pp.174-188. ⟨10.1016/j.crme.2014.01.006⟩. ⟨hal-01953956⟩

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