Jamming of frictional spheres and random loose packing
Jamming of frictional spheres and random loose packing
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DOI：
10.1039/c001973a
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发表时间：
2010-01-01
期刊：
影响因子：
3.4
通讯作者：
Silbert, Leonardo E.
中科院分区：
文献类型：
--
作者：
Silbert, Leonardo E.
利用计算机模拟研究了摩擦系数m对无序颗粒填料堵塞特性的影响。压缩，软球填料带来的堵塞过渡点，填料失去机械稳定性，通过减少包装分数。在堵塞过渡处的填充分数的值，phi（mu）（c），从零摩擦的随机紧密填充点逐渐减小到与随机松散填充一致的值，因为摩擦系数增加了几个数量级。这伴随着在阻塞转变处的配位数z（c）（mu）的减少，其随着摩擦的增加从大约6变化到4。普遍的幂律缩放观察到的压力和协调数作为距离的函数，从广义的，摩擦相关的干扰点。在phi（mu）（c）、z（c）（mu）和mu之间也报告了各种幂律。还研究了填料制备历史的依赖性。
The role of the friction coefficient, m, on the jamming properties of disordered, particle packings is studied using computer simulations. Compressed, soft-sphere packings are brought towards the jamming transition-the point where a packing loses mechanical stability-by decreasing the packing fraction. The values of the packing fraction at the jamming transition, phi(mu)(c), gradually decrease from the random close packing point for zero friction, to a value coincident with random loose packing as the friction coefficient is increased over several orders of magnitude. This is accompanied by a decrease in the coordination number at the jamming transition, z(c)(mu), which varies from approximately six to four with increasing friction. Universal power law scaling is observed in the pressure and coordination number as a function of distance from the generalised, friction-dependent jamming point. Various power laws are also reported between the phi(mu)(c), z(c)(mu), and mu. Dependence on preparation history of the packings is also investigated.