Why Do Granular Materials Stiffen with Shear Rate? Test of Novel Stress-Based Statistics

R. P. Behringer, Dapeng Bi, B. Chakraborty, S. Henkes, R. R. Hartley

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Abstract

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).

Original languageEnglish
Article number268301
Number of pages4
JournalPhysical Review Letters
Volume101
Issue number26
DOIs
Publication statusPublished - 31 Dec 2008

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