High-speed video images showing force propagation through a granular material made of photoelastic particles after impact by a large bronze disk.

From the article:

Nonlinear Force Propagation During Granular Impact
Abram H. Clark, Alec J. Petersen, Lou Kondic, and Robert P. Behringer
Phys. Rev. Lett. 114, 144502 (2015)

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