Robust propagation direction of stresses in a minimal granular packing

Details Robust propagation direction of stresses in a minimal granular packing Robust propagation direction of stresses in a minimal granular packing

2001-04-30

arxiv.org/abs/cond-mat/0104572v2

Eur. Phys. J. E 6, 99 (2001).

Physics

Condensed Matter

Statistical Mechanics

8 pages, 6 figures. Some extra clarification and minor improvements. To appear in EPJ-E

Scientific paper

10.1007/s101890170032

By employing the adaptive network simulation method, we demonstrate that the ensemble-averaged stress caused by a local force for packings of frictionless rigid beads is concentrated along rays whose slope is consistent with unity: forces propagate along lines at 45 degrees to the horizontal or vertical. This slope is shown to be independent of polydispersity or the degree to which the system is sheared. Further confirmation of this result comes from fitting the components of the stress tensor to the null stress constitutive equation. The magnitude of the response is also shown to fall off with the -1/2 power of distance. We argue that our findings are a natural consequence of a system that preserves its volume under small perturbations.

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