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Article Dans Une Revue Physical Review E Année : 2001

Slip events and dilatancy in a sheared fine noncohesive powder

Résumé

We present experimental results of the transition from steady-state sliding to oscillatory motion for a fine noncohesive powder, sheared in an annular cell. The onset of instability is compared to the Dieterich-Ruina model for solid friction. We present data showing that at low velocity and close to the transition, the major sliding jumps are preceded by a short or long period of unstable plastic yielding of the granular matter. This ambivalent behavior suggests that the jumps are initiated when the sliding overcomes a critical velocity. During the stick-slip motion, the dilatancy of the powder bed has been also observed: the slippage is associated with a compaction whose value increases with the jump in the friction coefficient.
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Dates et versions

hal-01652389 , version 1 (08-11-2019)

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M Lubert, Alain de Ryck. Slip events and dilatancy in a sheared fine noncohesive powder. Physical Review E , 2001, 63 (2, 1), pp.art. no.-021502. ⟨10.1103/PhysRevE.63.021502⟩. ⟨hal-01652389⟩
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