Force and Flow Transition in Plowed Granular Media

被引：92

作者：

Gravish, Nick ^{[1
]}

Umbanhowar, Paul B. ^{[2
]}

Goldman, Daniel I. ^{[1
]}

机构：

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

[2] Northwestern Univ, Dept Mech Engn, Evanston, IL 60208 USA

来源：

PHYSICAL REVIEW LETTERS | 2010年 / 105卷 / 12期

关键词：

LOCOMOTION;

D O I：

10.1103/PhysRevLett.105.128301

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We use plate drag to study the response of granular media to localized forcing as a function of volume fraction Phi. A bifurcation in the force and flow occurs at the onset of dilatancy Phi(c). Below Phi(c) rapid fluctuations in the drag force F-D are observed. Above Phi(c) fluctuations in F-D are periodic and increase in magnitude with Phi. Velocity field measurements indicate that the bifurcation in FD results from the formation of stable shear bands above Phi(c) which are created and destroyed periodically during drag. A friction-based wedge flow model captures the dynamics for Phi > Phi(c).

引用

页数：4

共 18 条

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