Spatial repartition of local plastic processes in different creep regimes in a granular material
| Autor: | T Darnige, Adeline Pons, Eric Clément, Axelle Amon, Jérôme J. Crassous |
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| Přispěvatelé: | Physique et mécanique des milieux hétérogenes (UMR 7636) (PMMH), Ecole Superieure de Physique et de Chimie Industrielles de la Ville de Paris (ESPCI Paris), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Cité (UPCité), Institut de Physique de Rennes (IPR), Université de Rennes (UR)-Centre National de la Recherche Scientifique (CNRS), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Sorbonne Université (SU)-Centre National de la Recherche Scientifique (CNRS)-Université de Paris (UP), Université de Rennes 1 (UR1), Université de Rennes (UNIV-RENNES)-Université de Rennes (UNIV-RENNES)-Centre National de la Recherche Scientifique (CNRS) |
| Rok vydání: | 2016 |
| Předmět: |
Diffusing-wave spectroscopy
Yield (engineering) Materials science General Physics and Astronomy FOS: Physical sciences Mechanics Condensed Matter - Soft Condensed Matter Granular material 01 natural sciences 010305 fluids & plasmas Stress (mechanics) Condensed Matter::Soft Condensed Matter Rheology Creep 0103 physical sciences Shear stress Coulomb Soft Condensed Matter (cond-mat.soft) 010306 general physics [PHYS.COND.CM-SCM]Physics [physics]/Condensed Matter [cond-mat]/Soft Condensed Matter [cond-mat.soft] |
| Zdroj: | EPL-Europhysics Letters EPL-Europhysics Letters, 2016, 113 (2), pp.28001. ⟨10.1209/0295-5075/113/28001⟩ EPL-Europhysics Letters, European Physical Society/EDP Sciences/Società Italiana di Fisica/IOP Publishing, 2016, 113 (2), pp.28001. ⟨10.1209/0295-5075/113/28001⟩ |
| ISSN: | 0295-5075 1286-4854 |
| DOI: | 10.48550/arxiv.1601.05671 |
| Popis: | International audience; 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. |
| Databáze: | OpenAIRE |
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