有限应变率下振动摩擦流的临界性
Criticality in vibrated frictional flows at finite strain rate
摘要：
我们的证据是弱振动的颗粒流的应变率的临界波动。引人注目的是，临界点出现在平均应变率和振动强度的{ \em finite}值处，远离零流速下的屈服临界点。我们发现，全球流变学，以及波动的幅度和相关时间，是一致的平均场，朗道的描述，应变率和应力作为共轭变量。我们介绍了一个通用的模型，捕捉观察到的现象，并认为这种类型的临界行为一般出现时，自流化与摩擦竞争。
英文摘要：
We evidence critical fluctuations in the strain-rate of granular flows that are weakly vibrated. Strikingly, the critical point arises at {\em finite} values of the mean strain rate and vibration strength, far away from the yielding critical point at zero flow rate. We show that the global rheology, as well as the amplitude and correlation time of the fluctuations, are consistent with a mean-field, Landau like description, where strain rate and stress act as conjugated variables. We introduce a general model which captures the observed phenomenology, and argue that this type of critical behavior generically arises when self fluidization competes with friction.
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