Force and fabric states in granular media

Farhang Radjai 1
1 PMMG - Physique et Mécanique des Milieux Granulaires
LMGC - Laboratoire de Mécanique et Génie Civil
Abstract : The plastic flow of granular materials reflects to a large extent the constraints imposed by steric exclusions and mechanical equilibrium at the particle scale. An accurate formulation of these local constraints is the key to a statistical mechanical approach but requires a rich set of state parameters. We show that the constraints can be taken into account in a simple way with a reduced set of anisotropy parameters akin to the lowest-order description of the contact and force networks. We then introduce a model of kinematic jamming defined as a state of saturation in the evolution of the contact network. This model correctly predicts the accessible geometrical states as well as the evolution of the system to a kinematically jammed state. We also show that a harmonic decomposition of shear stress as a function of the anisotropy parameters and phase factors representing the loading history leads to the "fragile" character of force networks.
Liste complète des métadonnées

Cited literature [11 references]  Display  Hide  Download
Contributor : Farhang Radjai <>
Submitted on : Saturday, April 21, 2012 - 12:22:39 AM
Last modification on : Monday, November 26, 2018 - 9:54:51 AM
Document(s) archivé(s) le : Sunday, July 22, 2012 - 2:20:30 AM


Files produced by the author(s)


  • HAL Id : hal-00690045, version 1


Farhang Radjai. Force and fabric states in granular media. Powders and Grains 2009, Jul 2009, Golden, United States. ⟨hal-00690045⟩



Record views


Files downloads