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Pré-Publication, Document De Travail Année : 2005

Memory of the Unjamming Transition during Cyclic Tiltings of a Granular Pile

Résumé

Discrete numerical simulations are performed to study the evolution of the micro-structure of a granular packing during successive load-unload cycles, consisting of quasi-static rotations in the gravity eld between opposite inclination angles. We show that both dynamic and structural quan- tities exhibit hysteresis during these cycles due to the exploration of di erent metastable states. Interestingly, the hysteretic behaviour of the pile strongly depends on the maximal inclination of the cycles, giving evidence of the irreversible modi cations of the pile state occurring close to the un- jamming transition. More speci cally, we show that for cycles with maximal inclination larger than the repose angle, the weak contact network carries the memory of the unjamming transition. These results demonstrate the relevance of a two-phases description -strong and weak contact networks- for a granular system, as soon as it has approached the unjamming transition.
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Dates et versions

hal-00005480 , version 1 (20-06-2005)
hal-00005480 , version 2 (21-09-2005)

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Stephanie Deboeuf, Olivier Dauchot, Lydie Staron, Jean-Pierre Vilotte, Anne Mangeney. Memory of the Unjamming Transition during Cyclic Tiltings of a Granular Pile. 2005. ⟨hal-00005480v1⟩
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