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Microscopic Origins of Shear Strength in Packings Composed of Elongated Particles

TitleMicroscopic Origins of Shear Strength in Packings Composed of Elongated Particles
Publication TypeConference Proceedings
Year of Publication2012
AuthorsAzéma E, Radjaï F
EditorBonelli S, Dascalu C, Nicot F
SponsorCEMAGREF, CNRS, EDF, Geophys Consult, Univ Joseph Fourier, Provence Alpes Cotes Azur Prov, RPILLAR
Conference Name9th International Workshop on Bifurcation and Degradation in Geomaterials (IWBDG 2011)
VolumeSpringer Series in Geomechanics and Geoengineering - ADVANCES IN BIFURCATION AND DEGRADATION IN GEOMATERIALS
Pagination21-27
Date PublishedApr-11-2012
Conference LocationMAY 23-26 2011 Porquerolles, FRANCE
KeywordsElongated particles, Fabric properties, force transmission, Harmonic decomposition
Abstract

We investigate the rheology, force transmission and texture of granular materials composed of elongated particles by means of contact dynamics simulations. The particles have a rounded-cap rectangular (RCR) shape described by a single elongation parameter varying from 0 for a circular particle to 1 for an infinitely thin or long particle. We study the quasi-static behavior, structural and force anisotropies as a function of the elongation parameter for packings submitted to biaxial compression. The shear strength is found to increase linearly with this parameter whereas the solid fraction both at the initial isotropic state and in the critical state is nonmonotonous. We show that for these elongated particles a harmonic decomposition of the stress tensor provides a fairly good approximation of the internal state. Our data suggest that the increase of shear strength with reflects both enhanced friction mobilization and anisotropic particle orientation as the elongation of the particles increases.

URLhttps://hal.archives-ouvertes.fr/hal-00686728
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