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Article Dans Une Revue EPL - Europhysics Letters Année : 2016

Spatial repartition of local plastic processes in different creep regimes in a granular material

Résumé

Granular packings under constant shear stress display below the Coulomb limit, a logarithmic creep dynamics. However the addition of small stress modulations induces a linear creep regime characterized by an effective viscous response. Using Diffusing Wave Spectroscopy, we investigate the relation between creep and local plastic events spatial distribution (" hot-spots ") contributing to the plastic yield. The study is done in the two regimes, i.e. with and without mechanical activation. The hot-spot dynamics is related to the material effective fluidity. We show that far from the threshold, a local visco-elastic rheology coupled to an ageing of the fluidity parameter, is able to render the essential spatio-temporal features of the observed creep dynamics.
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Dates et versions

hal-01260086 , version 1 (21-01-2016)

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A Pons, T Darnige, Jérôme Crassous, E Clément, Axelle Amon. Spatial repartition of local plastic processes in different creep regimes in a granular material. EPL - Europhysics Letters, 2016, 113 (2), pp.28001. ⟨10.1209/0295-5075/113/28001⟩. ⟨hal-01260086⟩
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