Numerical simulation of the propagation of stress disturbance in shock-loaded granular media using the discrete element method
Numerical simulation of the propagation of stress disturbance in shock-loaded granular media using the discrete element method
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使用离散元法数值模拟冲击载荷颗粒介质中应力扰动的传播
DOI：
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发表时间：
2009
期刊：
影响因子：
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通讯作者：
H. Komaki
中科院分区：
文献类型：
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作者：
Y. Sakamura;H. Komaki
采用离散元方法，数值模拟了矩形截面垂直槽道中球形颗粒组成的颗粒介质中应力扰动的传播规律。结果表明：(1)受最上层颗粒作用的冲击荷载通过随机分布在颗粒介质中的某些路径传递；(2)荷载在底壁上的分布并不均匀，(3)本文引入的单位面积局部平均内力有助于理解冲击作用下颗粒柱内的宏观荷载传递过程；(4)最大应力不是在颗粒柱的底壁上观察到的，而是在颗粒柱的上部或中部。
By using the discrete element method, we perform numerical simulations of the propagation of stress disturbance in granular media composed of spherical particles placed in a vertical channel with a rectangular cross section. The results show that (1) the shock loads subjected to the uppermost granular particles are transferred through certain paths randomly distributed in the granular medium, (2) the loads are not evenly distributed on the bottom wall as postulated in earlier works, (3) the locally averaged, internal force per unit area introduced in the present work is helpful to understand macroscopic load transfer processes inside shock-loaded granular columns, and (4) the maximum stress is not observed on the bottom wall, but in the upper or middle of the granular column.