Contact dynamics in a gently vibrated granular pile
arXiv:cond-mat/0303560 · doi:10.1103/PhysRevLett.92.035501
Abstract
We use multi-speckle diffusive wave spectroscopy (MSDWS) to probe the micron-scale dynamics of a granular pile submitted to discrete gentle taps. The typical time-scale between plastic events is found to increase dramatically with the number of applied taps. Furthermore, this microscopic dynamics weakly depends on the solid fraction of the sample. This process is strongly analogous to the aging phenomenon observed in thermal glassy systems. We propose a heuristic model where this slowing down mechanism is associated with a slow evolution of the distribution of the contact forces between particles. This model accounts for the main features of the observed dynamics.
4 pages, 4 figures
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- X-ray observation of micro-failures in granular piles approaching an avalanche
- Insights on the local dynamics induced by thermal cycling in granular matter
- Experiments in randomly agitated granular assemblies close to the jamming transition
- Invited review: Effect of temperature on a granular pile
- Compaction and mobility in randomly agitated granular assemblies