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

doi:10.3901/JME.2018.10.085

Abstract

Abstract: 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.

Key words: discrete element method (DEM), force chains, high velocity compaction, metal powder, quantization

CLC Number:

O320

ZHANG Wei, ZHOU Jian, YU Shiwei, ZHANG Xuejie, LIU Kun. Quantitative Investigation on Force Chains of Metal Powder in High Velocity Compaction by Using Discrete Element Method[J]. Journal of Mechanical Engineering, 2018, 54(10): 85-92.

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