Reorganization of a dense granular assembly: the unjamming response function.
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 two-dimensional 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 solicitation and after a large number of cycles the response is "quasireversible" with a remanent dissipation field exhibiting long range streams and vortexlike symmetry.
Kolb
Evelyne
E
Laboratoire des Milieux Désordonnés et Hétérogènes, UMR 7603, Université Pierre et Marie Curie, Boîte 86, 4 Place Jussieu, 75252 Paris Cedex 05, France.
Cviklinski
Jean
J
Lanuza
José
J
Claudin
Philippe
P
Clément
Eric
E