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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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Submitted on : Tuesday, September 27, 2011 - 9:40:59 AM
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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, American Physical Society, 2011, 107, 5 p. ⟨10.1103/PhysRevLett.107.138303⟩. ⟨insu-00626361⟩

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