Reorganization of a dense granular assembly: the `unjamming response function'

Details Reorganization of a dense granular assembly: the `unjamming response function' Reorganization of a dense granular assembly: the `unjamming response function'

2003-08-04

arxiv.org/abs/cond-mat/0308054v2

Physics

Condensed Matter

Soft Condensed Matter

5 pages, 5 figures, accepted version for publication in Phys. Rev. E

Scientific paper

10.1103/PhysRevE.69.031306

We investigate the mechanical properties of a static dense granular assembly in response to a local forcing. To this end, a small cyclic displacement is applied on a grain in the bulk of a 2D disordered packing under gravity and the displacement fields are monitored. We evidence a dominant long range radial response in the upper half part above the sollicitation and after a large number of cycles the response is `quasi-reversible' with a remanent dissipation field exhibiting long range streams and vortex-like symmetry.

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