Microscopic Origins of Shear Strength in Packings Composed of Elongated Particles

Emilien Azéma 1, * Farhang Radjai 1
* Auteur correspondant
1 PMMG - Physique et Mécanique des Milieux Granulaires
LMGC - Laboratoire de Mécanique et Génie Civil
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.
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Soumis le : mercredi 11 avril 2012 - 10:59:56
Dernière modification le : jeudi 7 juin 2018 - 14:20:02
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  • HAL Id : hal-00686728, version 1



Emilien Azéma, Farhang Radjai. Microscopic Origins of Shear Strength in Packings Composed of Elongated Particles. IWBDG, 2010, France. pp.1-7, 2010. 〈hal-00686728〉



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