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Article Dans Une Revue Granular Matter Année : 2015

Acoustics and frictional sliding in granular materials

Sean Mcnamara

Résumé

We study numerically the propagation of an acoustic pulse through a loaded granular material under the hypothesis that the conventional modeling of solid friction used in soft sphere discrete element mod-eling remains valid at acoustic time scales. As a pulse crosses the material, it temporarily suppresses sliding contacts, making it difficult to prepare states that correspond to experimental conditions. The pulse speed is strongly affected by the loading in a very anisotropic way, varying by as much as a factor of two depending on the propagation direction. We separate the contribution of the contact network from that of sliding contacts , and show that sliding contacts can reduce the propagation speed as much as changes in coordination number. Sliding contacts have a characteristic acoustic signature: pulse speed depends on sign (compression or rarefaction), even at very small amplitudes.
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Dates et versions

hal-01154388 , version 1 (02-06-2015)

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Sean Mcnamara. Acoustics and frictional sliding in granular materials. Granular Matter, 2015, 17 (3), pp.311. ⟨10.1007/s10035-015-0563-3⟩. ⟨hal-01154388⟩
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