Simulation Study of the Inhomogeneity Characteristics of Multiscale Mechanics during Metal Powder Compaction

doi:10.3901/JME.2024.02.168

Abstract

Abstract: In view of the complexity of practical research on the process of metal powder compaction, the simulation of the process of metal powder compaction is realized based on the theory of granular matter and the discrete element method. In particular, combined with the quantitative extraction and analysis methods of mechanical characteristics of stress at macroscopic scale, force chain at microscopic scale and contact force at microscopic scale, the Gini coefficient and participation number of contact force, the force chain strength inhomogeneity parameter, and the local stress inhomogeneity parameter have been used to analyze the inhomogeneity characteristics of multiscale mechanics quantitatively under the conditions of the different side wall friction coefficients and the friction coefficients between particles. The evolution of spatial inhomogeneous distribution of multiscale mechanical characteristics is also discussed. The multiscale simulation results show that the inhomogeneity of multiscale mechanical characteristics all decreases gradually during the process of powder compaction. With the increase of side wall friction coefficient and the friction coefficient between particles, the inhomogeneity of multiscale mechanical characteristics all increases gradually. At macroscopic mechanical scale, the side wall friction coefficient and the friction coefficient between particles both have significant effects on inhomogeneity. But at mesoscopic and microscopic mechanical scales, the friction coefficient between particles has more significant effects on inhomogeneity than the side wall friction coefficient. The spatial distribution of multiscale mechanical characteristics also tends to be homogenized gradually and keeps consistent at different mechanical scales. The works can provide theoretical basis and practical guiding for expanding the powder forming mechanics and the explanation of densification behavior of powder, as well as improving the densification level and the forming quality of green compacts.

Key words: discrete element method, metal powder compaction, multiscale mechanics, inhomogeneity, force chain

CLC Number:

O369
TF121

ZHANG Wei, XIAO Weijian, YUAN Chuanniu, CHEN Rongxin, ZHANG Ning, LIU Kun. Simulation Study of the Inhomogeneity Characteristics of Multiscale Mechanics during Metal Powder Compaction[J]. Journal of Mechanical Engineering, 2024, 60(2): 168-177.

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