Creep and fluidity of a real granular packing near jamming |
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Authors: | Nguyen Van Bau Darnige Thierry Bruand Ary Clement Eric |
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Institution: | PMMH, ESPCI, CNRS, UMR, Paris, France. |
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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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