Particle Scale Dynamics in Granular Impact

被引：156

作者：

Clark, Abram H. ^{[1
,2
]}

Kondic, Lou ^{[3
]}

Behringer, Robert P. ^{[1
,2
]}

机构：

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

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

[3] New Jersey Inst Technol, Dept Math Sci, Newark, NJ 07102 USA

来源：

PHYSICAL REVIEW LETTERS | 2012年 / 109卷 / 23期

基金：

美国国家科学基金会;

关键词：

PENETRATION;

D O I：

10.1103/PhysRevLett.109.238302

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We perform an experimental study of granular impact, where intruders strike 2D beds of photoelastic disks from above. High-speed video captures the intruder dynamics and the local granular force response, allowing investigation of grain-scale mechanisms in this process. We observe rich acoustic behavior at the leading edge of the intruder, strongly fluctuating in space and time, and we show that this acoustic activity controls the intruder deceleration, including large force fluctuations at short time scales. The average intruder dynamics match previous studies using empirical force laws, suggesting a new microscopic picture, where acoustic energy is carried away and dissipated. DOI: 10.1103/PhysRevLett.109.238302

引用

页数：5

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