# Experimental compaction of anisotropic granular media

1 GMCM - Groupe matière condensée et matériaux

Abstract : We report on experiments to measure the temporal and spatial evolution of packin g arrangements of anisotropic and weakly confined granular material, using high-resolution $\gamma$-ray adsorption. In these experiments, the particle configurations start from an initially disordered, low-packing-fraction state and under vertical solicitation s evolve to a dense state. We find that the packing fraction evolution is slowed by the grain anisotropy but, as for spherically shaped grains, can be well fitted by a stretched exponential. For a given type of grains, the characteristic times of relaxation and of convec tion are found to be of the same order of magnitude. On the contrary compaction mechanisms in the media strongly depend on the grain anisotropy.

keyword : granular materials granular compaction anisotropy

Author: Philippe Ribière - Patrick Richard - Daniel Bideau - Renaud Delannay -

Source: https://hal.archives-ouvertes.fr/