Gas-mediated impact dynamics in fine-grained granular materials

被引:41
作者
Royer, John R.
Corwin, Eric I.
Eng, Peter J.
Jaeger, Heinrich M.
机构
[1] Univ Chicago, James Franck Inst, Chicago, IL 60637 USA
[2] Univ Chicago, Dept Phys, Chicago, IL 60637 USA
[3] Univ Chicago, Consortium Adv Radiat Sources, Chicago, IL 60637 USA
基金
美国国家科学基金会;
关键词
D O I
10.1103/PhysRevLett.99.038003
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
Noncohesive granular media exhibit complex responses to sudden impact that often differ from those of ordinary solids and liquids. We investigate how this response is mediated by the presence of interstitial gas between the grains. Using high-speed x-ray radiography we track the motion of a steel sphere through the interior of a bed of fine, loose granular material. We find a crossover from nearly incompressible, fluidlike behavior at atmospheric pressure to a highly compressible, dissipative response once most of the gas is evacuated. We discuss these results in light of recent proposals for the drag force in granular media.
引用
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页数:4
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