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Journal Articles Physical Review Letters Year : 2011

Creep and fluidity of a real granular packing near jamming

Abstract

We study the internal dynamical processes taking place in a granular packing below yield stress. At all packing fractions and down to vanishingly low applied shear, a logarithmic creep is observed. The experiments are analyzed using a viscoelastic model which introduces an internal, time-dependent, fluidity variable. For all experiments, the creep dynamics can be rescaled onto a unique curve which displays jamming at the random-close-packing limit. At each packing fraction, we measure a stress corresponding to the onset of internal granular reorganization and a slowing down of the creep dynamics before the final yield.
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Dates and versions

insu-00626361 , version 1 (27-09-2011)

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van Bau Nguyen, Thierry Darnige, Ary Bruand, Eric Clément. Creep and fluidity of a real granular packing near jamming. Physical Review Letters, 2011, 107, 5 p. ⟨10.1103/PhysRevLett.107.138303⟩. ⟨insu-00626361⟩
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