CUED Publications database

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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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
Divisions: Div C > Biomechanics
Depositing User: Unnamed user with email
Date Deposited: 09 Dec 2016 17:10
Last Modified: 27 Apr 2017 00:21