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Contact dynamics in a gently vibrated granular pile.

Kabla, A and Debrégeas, G (2004) Contact dynamics in a gently vibrated granular pile. Phys Rev Lett, 92. 035501-. ISSN 0031-9007

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Abstract

We use multispeckle diffusive wave spectroscopy to probe the micron-scale dynamics of a water-saturated 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 largely 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.

Item Type: Article
Subjects: UNSPECIFIED
Divisions: Div C > Biomechanics
Depositing User: Cron Job
Date Deposited: 07 Mar 2014 11:29
Last Modified: 21 Apr 2014 01:10
DOI:

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