Gas-Mediated Impact Dynamics in Fine-Grained Granular Materials

Details Gas-Mediated Impact Dynamics in Fine-Grained Granular Materials Gas-Mediated Impact Dynamics in Fine-Grained Granular Materials

2007-02-14

arxiv.org/abs/cond-mat/0702339v2

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 4 figures, Accepted to PRL

Scientific paper

10.1103/PhysRevLett.99.038003

Non-cohesive 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, fluid-like 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.

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