Why do granular materials stiffen with shear rate? Test of novel stress-based statistics

Recent experiments exhibit a rate dependence for granular shear such that the stress grows linearly in the logarithm of the shear rate, gamma. Assuming a generalized activated process mechanism, we show that these observations are consistent with a recent proposal for a stress-based statistical ense...

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Bibliographic Details
Published in:Physical review letters 2008-12, Vol.101 (26), p.268301-268301, Article 268301
Main Authors: Behringer, R P, Bi, Dapeng, Chakraborty, B, Henkes, S, Hartley, R R
Format: Article
Language:English
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Summary:Recent experiments exhibit a rate dependence for granular shear such that the stress grows linearly in the logarithm of the shear rate, gamma. Assuming a generalized activated process mechanism, we show that these observations are consistent with a recent proposal for a stress-based statistical ensemble. By contrast, predictions for rate dependence using conventional energy-based statistical mechanics to describe activated processes, predicts a rate dependence of (ln(gamma))(1/2).
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.101.268301