Footprints in Sand: The Response of a Granular Material to Local Perturbations
arXiv:cond-mat/0012127 · doi:10.1103/PhysRevLett.87.035506
Abstract
We experimentally determine ensemble-averaged responses of granular packings to point forces, and we compare these results to recent models for force propagation in a granular material. We used 2D granular arrays consisting of photoelastic particles: either disks or pentagons, thus spanning the range from ordered to disordered packings. A key finding is that spatial ordering of the particles is a key factor in the force response. Ordered packings have a propagative component that does not occur in disordered packings.
5 pages, 4 eps figures, Phys. Rev. Lett. 87, 035506 (2001)
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