Investigation on the Friction Mechanism and Its Relation to the Force Chains during Powder Compaction

Zhang, Wei; Zhang, Shuai; Tan, Jianjun; Du, Jing; Zhang, Ning

doi:10.7566/jpsj.89.124602

Cited by 7 publications

(8 citation statements)

References 35 publications

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“…[6] Reference [27] showed that the simulation model with a height-to-width ratio of 1:1 is suitable for studying the friction phenomenon of powder compaction. Moreover, the simulation model with a width of about 0.02 m has been widely studied, [6,27,29] so the simulation model with a width of 0.02 m and a height of 0.02 m is appropriate. The ferrous powder in this model has an initial relative density of 84% and then settled down under gravity (9.8 m/s 2 ).…”

Section: Dem Modelingmentioning

confidence: 99%

“…The values of density, Poisson's ratio and elastic 024501-3 modulus of particles are set according to the parameters of the ferrous powder. [29] The friction coefficient of ferrous powder is 0.25 based on Ref. [11].…”

Section: Dem Modelingmentioning

confidence: 99%

“…At this axial strain, the corresponding pressure is approximately 640 MPa. [8,29] To verify the reliability of the data, fitting Heckel equation is implemented. The compression behavior of the metal powder is widely analyzed by using the Heckel model.…”

Section: Dem Modelingmentioning

confidence: 99%

“…Several criteria currently exist for characterizing the force chain, such as the principal stress criterion and contact force criterion. [15,16,21,22,29] All these criteria define one force chain as a complex consisting of at least three particles. In this work, the force chain retrieval algorithm is obtained according to the recent literature.…”

Section: Force Chain Retrieval Algorithmmentioning

confidence: 99%

“…However, obtaining more data for quantitative analysis through the photo elastic experiment is problematic. Zhang et al [29] employed a contact force criterion to examine the relationship between the friction of the side wall and the networks of contact forces from the macroscopic and microscopic aspects. The friction characteristics between particles need to be studied further.…”

Section: Introductionmentioning

confidence: 99%

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Correlation mechanism between force chains and friction mechanism during powder compaction

Zhang

Tan

et al. 2022

Chinese Phys. B

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The relation between friction mechanism and force chains characteristics has not yet been fully studied in the powder metallurgy research area. In this work, a uniaxial compression discrete element model is established based on the compaction process of ferrous powder. Furthermore, the correlation mechanism between force chains and the friction mechanism during powder compaction is investigated. The simulation results reveal a strong correlation between the variation of the friction coefficient and the evolution of force chains. During the powder compaction, the friction coefficient would eventually tend to be stable, a feature which is also closely related to the slip ratio between particles. The side wall friction and the friction between particles would have an important effect on the direction of force chain growth in about one-third of the area near the side wall. The research results provide theoretical guidance for improving the densification process of the powder according to the force chain and friction.

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