Force fluctuations in a vertically pushed granular column |
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Authors: | E Kolb T Mazozi E Clément J Duran |
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Institution: | Laboratoire des Milieux Désordonnés et Hétérogènes (UMR 7603), Université Pierre et Marie Curie, Bo?te 86, 4 Place Jussieu, 75005 Paris, France, FR
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Abstract: | We present series of experiments on the resistance force encountered by a bottom piston pushing a vertical granular column
confined in a two-dimensional cell. We show that, due to the presence of friction at the boundaries and between the grains,
the signal shows many complex features. At slow driving velocities, we observe a transition to a stick-slip dynamic instability.
Depending on the granular material used, the elementary stick-slip events may either be well characterized or largely distributed.
We present a statistical study on the waiting time between events and the distribution of energy release as a function of
the spring stiffness and the driving velocity.
Received 5 August 1998 and Received in final form 22 October 1998 |
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Keywords: | PACS 46 10 +z Mechanics of discrete systems - 05 40 +j Fluctuation phenomena random processes and Brownian motion - 83 70 Fn Granular solids |
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