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

Autor:	Behringer, Robert P., Bi, Dapeng, Chakraborty, Bulbul, Henkes, Silke, Hartley, Robert R.
Rok vydání:	2008
Předmět:	Condensed Matter - Soft Condensed Matter Condensed Matter - Statistical Mechanics
Druh dokumentu:	Working Paper
DOI:	10.1103/PhysRevLett.101.268301
Popis:	Recent experiments exhibit a rate-dependence for granular shear such that the stress grows linearly in the logarithm of the shear rate, \dot{\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 that of (\ln (\dot{\gamma}))^{1/2}. Comment: 4 pages, 4 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/0810.4891 Zobrazit plný text záznamu View this record from Arxiv