Force transmission in a packing of pentagonal particles
Force transmission in a packing of pentagonal particles
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DOI：
10.1103/physreve.76.011301
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发表时间：
2007-07-01
影响因子：
2.4
通讯作者：
Peyroux, Robert
中科院分区：
文献类型：
--
作者：
Azema, Emilien;Radjai, Farhang;Peyroux, Robert
我们进行了详细的分析，在一个密集的五角形颗粒的约束堆积的接触力网络模拟的接触动力学方法。颗粒形状的影响是通过比较五边形填料和具有相同特性的填料的数据来证明的，除了颗粒的圆形形状。这项工作的一个违反直觉的发现是，在稳定剪切下，五边形填料比圆盘填料具有更低的结构各向异性。我们表明，这种弱点可以通过更高的力各向异性来补偿，从而增强五边形填料的剪切强度。我们重新审视了五角形填充中的“强”和“弱”力网络，但我们的模拟数据也为主要由顶点到边缘接触承载的一大类“非常弱”力提供了证据。强作用力链主要由边缘到边缘的接触组成，具有明显的锯齿形外观和递减的指数概率分布，就像在圆盘包装中一样。
We perform a detailed analysis of the contact force network in a dense confined packing of pentagonal particles simulated by means of the contact dynamics method. The effect of particle shape is evidenced by comparing the data from pentagon packing and from a packing with identical characteristics, except for the circular shape of the particles. A counterintuitive finding of this work is that, under steady shearing, the pentagon packing develops a lower structural anisotropy than the disk packing. We show that this weakness is compensated by a higher force anisotropy, leading to enhanced shear strength of the pentagon packing. We revisit "strong" and "weak" force networks in the pentagon packing, but our simulation data also provide evidence for a large class of "very weak" forces carried mainly by vertex-to-edge contacts. The strong force chains are mostly composed of edge-to-edge contacts with a marked zigzag aspect and a decreasing exponential probability distribution as in a disk packing.