Entangled Granular Media

被引：103

作者：

Gravish, Nick ^{[1
]}

Franklin, Scott V. ^{[2
]}

Hu, David L. ^{[3
]}

Goldman, Daniel I. ^{[1
]}

机构：

[1] Georgia Inst Technol, Sch Phys, Atlanta, GA 30332 USA

[2] Rochester Inst Technol, Dept Phys, Rochester, NY 14623 USA

[3] Georgia Inst Technol, Sch Mech Engn, Atlanta, GA 30332 USA

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 108卷 / 20期

基金：

美国国家科学基金会;

关键词：

SUSPENSIONS; RELAXATION; COMPACTION; PACKINGS; RHEOLOGY; DYNAMICS; COLLOIDS; GLASSES;

D O I：

10.1103/PhysRevLett.108.208001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We study the geometrically induced cohesion of ensembles of granular "u particles" that mechanically entangle through particle interpenetration. We vary the length-to-width ratio l/w of the u particles and form them into freestanding vertical columns. In a laboratory experiment, we monitor the response of the columns to sinusoidal vibration (with peak acceleration Gamma). Column collapse occurs in a characteristic time tau which follows the relation tau proportional to exp(Gamma/Delta). Delta resembles an activation energy and is maximal a intermediate l/w. A simulation reveals that optimal strength results from competition between packing and entanglement.

引用

页数：4

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