Universal structural characteristics of planar granular packs.

Universal structural characteristics of planar granular packs.
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平面颗粒包装的通用结构特征。

DOI:
10.1103/physrevlett.112.098003
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发表时间:
2014
影响因子:
8.6
通讯作者:
Matsushima T
Matsushima T
中科院分区:
物理与天体物理1区
文献类型:
--
作者:
Matsushima T

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颗粒材料的结构自组织对制备和颗粒参数的依赖性是预测建模的关键。我们研究了60种不同的机械平衡的多分散盘包,由两个协议产生的数值。我们发现,对于相同方差的圆盘尺寸分布(DSD),(1)的平均配位数的rattler-free包与包装分数是一个独立的函数的初始条件,摩擦,和DSD,和(2)所有的四边形体积和细胞的顺序分布崩溃的通用形式,也独立于上述。这种明显的普遍性表明,与常识相反,平衡的颗粒结构可能主要由包装协议和DSD的高阶矩决定。
The dependence of structural self-organization of granular materials on preparation and grain parameters is key to predictive modeling. We study 60 different mechanically equilibrated polydisperse disc packs, generated numerically by two protocols. We show that, for same-variance disc size distributions (DSDs), (1) the mean coordination number of rattler-free packs versus the packing fraction is a function independent of initial conditions, friction, and the DSD, and (2) all quadron volume and cell order distributions collapse to universal forms, also independent of the above. This apparent universality suggests that, contrary to common wisdom, equilibrated granular structures may be determined mainly by the packing protocol and higher moments of the DSD.
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