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Correlation mechanism of friction behavior and topological properties of the contact network during powder compaction

引用

Particuology 2023年第11期82卷 98-110页

作者： Wei Zhang Chuanniu Yuan Shuai Zhang Weijian Xiao Ning Zhang Rongxin Chen School of Mechanical and Automotive Engineering Fujian University of TechnologyFuzhou350118China

The effect of friction behavior on the compacted density is significant, but the relationship between the topological properties of the contact network and friction behavior during powder compaction remains unclear. Based on the discrete element method (DEM), a DEM model for die compaction was established, and the Hertz contact model was modified into an elastoplastic contact model that was more suitable for metal-powder compaction. The evolution of the topological properties of the contact network and its mechanism during powder compaction was explored using the elastoplastic contact model. The results demonstrate that the friction behavior between the particles is closely related to the topological properties of the contact network. Side wall friction results in smaller clustering coefficient (CC) and excess contact (EC) in the lower region near the side wall. Corresponding to this phenomenon, the upper region near the side wall has more high-stress particles when the major principal stress threshold was considered, and the CC and EC are significantly higher than those in the other regions. This study provides a theoretical basis for improving powder compaction behavior.

关键词： Powdercompaction granularmatter Discrete element method Topological property Friction behavior

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