Quantitative Investigation on Force Chains of Metal Powder in High Velocity Compaction by Using Discrete Element Method

被引：8

作者：

Zhang, Wei ^{[1
]}

Zhou, Jian ^{[1
]}

Yu, Shiwei ^{[1
]}

Zhang, Xuejie ^{[1
]}

Liu, Kun ^{[1
]}

机构：

[1] Institute of Tribology, Hefei University of Technology, Hefei,230009, China

来源：

Jixie Gongcheng Xuebao/Journal of Mechanical Engineering | 2018年 / 54卷 / 10期

关键词：

Powder metals - Compaction;

D O I：

10.3901/JME.2018.10.085

中图分类号：

O24 [计算数学];

学科分类号：

070102 ;

摘要：

As the meso-scale structure of powder granular system, force chains play a role as a link between micro movement of powder and macroscopic mechanical properties. The number, length, strength and collimation coefficient of force chains of metal powder in high velocity compaction (HVC) have been investigated quantitatively by using discrete element method (DEM). The difference of force chains between HVC and conventional compaction (CC) have been investigated. The different influential factors for force chains in HVC have also been analyzed. This investigation shows that the number, length, strength and collimation coefficient of force chains have changed more quickly in HVC than in CC. What's more, the initial conditions of force chains in HVC and CC are different. In HVC process, the characteristics of force chains for powder particles of μ=0 and μ≠0 are quite different. Although systems with different initial porosity have distinct characteristics of force chains during process, their final conditions are almost the same in the end. The variation in the characteristics of force chains is more drastic with the increasing of impact velocity. This investigation would expand the theoretical basis about phenomenon of densification and density homogenization of powder in HVC based on force chains. © 2018 Journal of Mechanical Engineering.

引用

页码：85 / 92