COMPUTER-SIMULATION OF RANDOM PACKINGS OF SPHERES WITH LOG-NORMAL DISTRIBUTIONS
COMPUTER-SIMULATION OF RANDOM PACKINGS OF SPHERES WITH LOG-NORMAL DISTRIBUTIONS
复制标题
DOI：
10.1016/s0032-5910(05)80012-9
复制
发表时间：
1993-09-01
影响因子：
5.2
通讯作者：
KAVANAGH, PE
中科院分区：
文献类型：
--
作者：
NOLAN, GT;KAVANAGH, PE
描述了一种计算机模拟，它可以产生随机填充的晶格组成的领域，服从对数正态分布的绝对标准偏差在0至0.84的范围内。填料是重力稳定的，范围从随机松散填料到随机紧密填料。密堆积和松堆积晶格的堆积密度随着分布的绝对标准偏差而增加。晶格的结构由低绝对标准偏差的职业机制确定，并且其在堆积密度/平均坐标平面中的位置是桥接和接触球体之间的角间距的函数。随着标准差的增加，出现了从职业机制到填补机制的过渡。填充机制的特征在于小颗粒嵌套在由较大球体产生的空隙内，这些较大球体在晶格内形成基础结构。这些晶格内的桥接程度降低到非常低的水平，并且在堆积密度/平均坐标平面中的位置主要是接触球体的角间距的函数。
A computer simulation is described which can produce randomly packed lattices consisting of spheres which obey the log-normal distribution with absolute standard deviations in the range 0 to 0.84. The packings are gravitationally stable and range from random loose packing to random close packing. The packing density for both close and loose packed lattices increases with the absolute standard deviation of the distribution. The structure of the lattice is determined by the occupational mechanism for low absolute standard deviations and its position in the packing density/mean co-ordination plane is a function of both bridging and the angular separation between contacting spheres. As the standard deviation increases, there is a transition from the occupational to the filling mechanism. The filling mechanism is characterised by small particles nesting within the voids produced by larger spheres which form an infrastructure inside the lattice. The degree of bridging within these lattices is reduced to a very low level and the position in the packing density/mean co-ordination plane is a function principally of the angular separation of contacting spheres.