Particle scale dynamics in granular impact

Abram H. Clark, Lou Kondic, Robert P. Behringer

Research output: Contribution to journalArticlepeer-review

151 Scopus citations


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.

Original languageEnglish (US)
Article number238302
JournalPhysical Review Letters
Issue number23
StatePublished - Dec 7 2012

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy


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