Abstract
We study the geometrically induced cohesion of ensembles of granular “ particles” that mechanically entangle through particle interpenetration. We vary the length-to-width ratio of the particles and form them into freestanding vertical columns. In a laboratory experiment, we monitor the response of the columns to sinusoidal vibration (with peak acceleration ). Column collapse occurs in a characteristic time which follows the relation . resembles an activation energy and is maximal at intermediate . A simulation reveals that optimal strength results from competition between packing and entanglement.
- Received 8 December 2011
DOI:https://doi.org/10.1103/PhysRevLett.108.208001
© 2012 American Physical Society
Synopsis
U-shaped Grains Get Clingy
Published 17 May 2012
Piles of staples stand up to shaking better if the staple prongs have an intermediate length.
See more in Physics