Local contact numbers in two dimensional packings of frictional disks

Details Local contact numbers in two dimensional packings of frictional disks Local contact numbers in two dimensional packings of frictional disks

2009-11-27

arxiv.org/abs/0911.5134v1

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 5 figures

Scientific paper

We analyze the local structure of two dimensional packings of frictional disks numerically. We focus on the fractions x_i of particles that are in contact with i neighbors, and systematically vary the confining pressure p and friction coefficient \mu. We find that for all \mu, the fractions x_i exhibit powerlaw scaling with p, which allows us to obtain an accurate estimate for x_i at zero pressure. We uncover how these zero pressure fractions x_i vary with \mu, and introduce a simple model that captures most of this variation. We also probe the correlations between the contact numbers of neighboring particles.

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