Jamming of 3D prolate granular materials

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Title: Jamming of 3D prolate granular materials
Author: Desmond, Kenneth; Franklin, Scott
Abstract: We have found that the ability of long thin rods to jam into a solid-like state in response to a local perturbation depends upon both the particle aspect ratio and the container size. The dynamic phase diagram in this parameter space reveals a broad transition region separating granular stick-slip and solid-like behavior. In this transition region the pile displays both solid and stick-slip behavior. We measure the force on a small object pulled through the pile, and find the fluctuation spectra to have power law tails with an exponent characteristic of the region. The exponent varies from = −2 in the stick-slip region to = −1 in the solid region. These values reflect the different origins — granular rearrangements vs. dry friction — of the fluctuations. Finally, the packing fraction shows only a slight dependence on container size, but depends on aspect ratio in a manner predicted by a mean field theory and implies an aspect-ratio independent contact number of hci = 5.25 ± 0.03.
Description: RIT community members may access full-text via RIT Libraries licensed databases: http://library.rit.edu/databases/
Record URI: http://hdl.handle.net/1850/7235
Publishers URL: http://dx.doi.org/10.1103/PhysRevE.73.031306
Date: 2006-03-23

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