Anomalous density dependence of static friction in sand

Details Anomalous density dependence of static friction in sand Anomalous density dependence of static friction in sand

1996-06-12

arxiv.org/abs/cond-mat/9606085v1

Phys.Rev. E, Vol.54, 2005 (1996)

Physics

Condensed Matter

plain tex, 6 pages, to appear in Phys.Rev.E

Scientific paper

10.1103/PhysRevE.54.2005

We measured experimentally the static friction force $F_s$ on the surface of a glass rod immersed in dry sand. We observed that $F_s$ is extremely sensitive to the closeness of packing of grains. A linear increase of the grain-density yields to an exponentially increasing friction force. We also report on a novel periodicity of $F_s$ during gradual pulling out of the rod. Our observations demonstrate the central role of grain bridges and arches in the macroscopic properties of granular packings.

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