Stress fluctuations in a 2D granular Couette experiment: A continuous transition

被引：422

作者：

Howell, D ^{[1
]}

Behringer, RP

Veje, C

机构：

[1] Duke Univ, Dept Phys, Durham, NC 27708 USA

[2] Duke Univ, Ctr Nonlinear & Complex Syst, Durham, NC 27708 USA

[3] Niels Bohr Inst, DK-2100 Copenhagen, Denmark

来源：

PHYSICAL REVIEW LETTERS | 1999年 / 82卷 / 26期

关键词：

D O I：

10.1103/PhysRevLett.82.5241

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Experiments on a slowly sheared 2D granular material show a continuous transition as the packing fraction gamma passes through gamma(c) similar or equal to 0.776. The mean stress, <(sigma)over bar>, plays the role of an order parameter. As gamma --> gamma(c) from above, (1) the compressibility becomes large, (2) a slowing down of the mean velocity occurs, (3) the force distributions change, and (4) the network of stress chains changes from intermittent long radial chains near gamma(c) to a tangled dense network for larger gamma.

引用

页码：5241 / 5244

页数：4

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