Correlation mechanism of friction behavior and topological properties of the contact network during powder compaction--颗粒学报PARTICUOLOGY

Zhang, W., Yuan, C., Zhang, S., Xiao, W., Zhang, N., & Chen, R. (2023). Correlation mechanism of friction behavior and topological properties of the contact network during powder compaction. Particuology, 82, 98-110. https://doi.org/10.1016/j.partic.2023.01.013

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

Wei Zhang ^*, Chuanniu Yuan, Shuai Zhang, Weijian Xiao, Ning Zhang, Rongxin Chen

School of Mechanical and Automotive Engineering, Fujian University of Technology, Fuzhou, 350118, China

10.1016/j.partic.2023.01.013

Volume 82, November 2023, Pages 98-110

Received 14 August 2022, Revised 4 December 2022, Accepted 19 January 2023, Available online 6 February 2023, Version of Record 11 February 2023.

E-mail: zw1256@fjut.edu.cn

Highlights

• Based on die powder compaction, an elastic-plastic contact model is developed for metal powder compaction.

• Elastic-plastic contact model used is more reasonable than the widely used Hertz elastic contact model.

• Topological properties of contact network can characterize the relationship of friction behavior during powder compaction.

• Due to frictional behavior, topological properties of contact network have different manifestations in different regions.

Abstract

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.

Graphical abstract

Keywords

Powder compaction; Granular matter; Discrete element method; Topological property; Friction behavior

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