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

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

Research output: Contribution to journalArticle (Academic Journal)peer-review

37 Citations (Scopus)


Recent experiments exhibit a rate dependence for granular shear such that the stress grows linearly in the logarithm of the shear rate, γ̇. 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 (γ̇))1/2.

Original languageEnglish
Article number268301
JournalPhysical Review Letters
Issue number26
Publication statusPublished - 22 Dec 2008

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