为什么颗粒材料会随着剪切速率而变硬？一种新的基于压力的统计方法的检验
Why Do Granular Materials Stiffen with Shear Rate? A Test of Novel Stress-Based Statistics
摘要：
最近的实验表明，颗粒剪切的速率依赖性，使应力线性增长的对数的剪切速率，\dot γ。假设一个广义的激活过程机制，我们表明，这些意见是一致的，最近提出的基于压力的统计合奏。相比之下，使用传统的基于能量的统计力学来描述活化过程的速率依赖性预测，预测的速率依赖性为（\ln（\dot γ））^{1/2}。
英文摘要：
Recent experiments exhibit a rate-dependence for granular shear such that the stress grows linearly in the logarithm of the shear rate, \dotγ. 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 (\dotγ))^{1/2}.
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