Journal
MECHANICS OF MATERIALS
Volume 39, Issue 7, Pages 664-684Publisher
ELSEVIER
DOI: 10.1016/j.mechmat.2006.10.003
Keywords
homogenization; granular material; Love formula; micro-structure; second-order work
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It is now well established that for non-associated materials such as geomaterials, a broad domain exists, strictly within the plastic limit, where different failure modes can coexist. In particular, material instability as defined by Hill [Hill, R., 1958. A general theory of uniqueness and stability in elastic-plastic solids. J. Mech. Phys. Solids, 6, 236-249], related to the vanishing of the second-order work, can potentially occur. In this paper, we focus on granular materials and establish from theoretical considerations that the macroscopic second-order work on the assembly scale is related to the microscopic second-order work computed on each contact. This question is examined from a multi-scale approach, and the relation between macroscopic and microscopic second-order works is brought to light using a micro-mechanically based model. Finally, these theoretical results are confirmed from numerical simulations based on a discrete element method. (c) 2006 Elsevier Ltd. All rights reserved.
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