论文标题

用可调的粗糙度堵塞

Jamming with tunable roughness

论文作者

Ikeda, Harukuni, Brito, Carolina, Wyart, Matthieu, Zamponi, Francesco

论文摘要

我们引入了一个新模型,以研究表面粗糙度对干扰过渡的影响。通过执行数值模拟,我们表明,对于平滑表面,干扰过渡密度和过渡点的接触数在增加时都会增加,因为椭圆形和球形固定器。相反,对于粗糙的表面,在与摩擦颗粒的行为的定量一致性中,两个量都降低。此外,在与库仑摩擦法相对应的极限中,该模型满足了先前研究中提出的广义等静态标准。我们介绍了一个计数论点,以证明该标准并用几何解释。最后,我们提出了一个简单的理论,可以从无限摩擦极限中的力分布的知识中预测有限摩擦处的接触数。

We introduce a new model to study the effect of surface roughness on the jamming transition. By performing numerical simulations, we show that for a smooth surface, the jamming transition density and the contact number at the transition point both increase upon increasing asphericity, as for ellipsoids and spherocylinders. Conversely, for a rough surface, both quantities decrease, in quantitative agreement with the behavior of frictional particles. Furthermore, in the limit corresponding to the Coulomb friction law, the model satisfies a generalized isostaticity criterion proposed in previous studies. We introduce a counting argument that justifies this criterion and interprets it geometrically. Finally, we propose a simple theory to predict the contact number at finite friction from the knowledge of the force distribution in the infinite friction limit.

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