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.
@article{arxiv.cond-mat/0308054,
title = {Reorganization of a dense granular assembly: the `unjamming response function'},
author = {E. Kolb and J. Cviklinski and J. Lanuza and P. Claudin and E. Clement},
journal= {arXiv preprint arXiv:cond-mat/0308054},
year = {2009}
}
Comments
5 pages, 5 figures, accepted version for publication in Phys. Rev. E