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

被引:45
作者
Behringer, R. P. [1 ]
Bi, Dapeng [2 ]
Chakraborty, B. [2 ]
Henkes, S. [2 ]
Hartley, R. R. [1 ]
机构
[1] Duke Univ, Dept Phys, Durham, NC 27708 USA
[2] Brandeis Univ, Dept Phys, Waltham, MA 02454 USA
关键词
D O I
10.1103/PhysRevLett.101.268301
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
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).
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页数:4
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