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.
François Nicot 1; Nejib Hadda 1; Luc Sibille 2; Farhang Radjai 3; Pierre-Yves Hicher 4; Félix Darve 5
@article{CRMECA_2014__342_3_174_0, author = {Fran\c{c}ois Nicot and Nejib Hadda and Luc Sibille and Farhang Radjai and Pierre-Yves Hicher and F\'elix Darve}, title = {Some micromechanical aspects of failure in granular materials based on second-order work}, journal = {Comptes Rendus. M\'ecanique}, pages = {174--188}, publisher = {Elsevier}, volume = {342}, number = {3}, year = {2014}, doi = {10.1016/j.crme.2014.01.006}, language = {en}, }
TY - JOUR AU - François Nicot AU - Nejib Hadda AU - Luc Sibille AU - Farhang Radjai AU - Pierre-Yves Hicher AU - Félix Darve TI - Some micromechanical aspects of failure in granular materials based on second-order work JO - Comptes Rendus. Mécanique PY - 2014 SP - 174 EP - 188 VL - 342 IS - 3 PB - Elsevier DO - 10.1016/j.crme.2014.01.006 LA - en ID - CRMECA_2014__342_3_174_0 ER -
%0 Journal Article %A François Nicot %A Nejib Hadda %A Luc Sibille %A Farhang Radjai %A Pierre-Yves Hicher %A Félix Darve %T Some micromechanical aspects of failure in granular materials based on second-order work %J Comptes Rendus. Mécanique %D 2014 %P 174-188 %V 342 %N 3 %I Elsevier %R 10.1016/j.crme.2014.01.006 %G en %F CRMECA_2014__342_3_174_0
François Nicot; Nejib Hadda; Luc Sibille; Farhang Radjai; Pierre-Yves Hicher; Félix Darve. Some micromechanical aspects of failure in granular materials based on second-order work. Comptes Rendus. Mécanique, Volume 342 (2014) no. 3, pp. 174-188. doi : 10.1016/j.crme.2014.01.006. https://comptes-rendus.academie-sciences.fr/mecanique/articles/10.1016/j.crme.2014.01.006/
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