Numerical investigation into the densification of ferrous powder in high velocity compaction. (10th April 2020)

• Record Type: Journal Article
• Authors: Zhang, Wei; Liu, Kun; Zhou, Jian; Chen, Rongxin; Zhang, Ning; Lian, Guofu
• Is Part Of: Physica scripta. Volume 95:Number 6(2020)
• Publication Date: 2020-04-10
• Subjects: discrete element method -- granular matter -- force chain -- densification -- high velocity compaction; Physics -- Periodicals; 530.05
• DOI: 10.1088/1402-4896/ab8580
• Languages: English
• ISSNs: 0031-8949

Abstract

Abstract: The densification of ferrous powder in high velocity compaction (HVC) is numerically captured by using discrete element method. Macro property (porosity), micro properties (coordination number (CN), radial distribution function (RDF) and unbalanced force), and meso properties (force chains and their orientations) are characterized and analyzed. The effect of force chains on the densification mechanism is studied. The densification in HVC is reciprocating in accordance with the evolution of local porosity and CN. This phenomenon can be promoted by the peak of unbalanced force. The number of peaks in RDF changes from three to four during densification. In addition, force chains evolve from top to bottom and then move in reverse. The distribution of force chains is related to the CN evolution, and the degree of densification is affected by the force chain strength. Force chains can promote densification by pushing particles and squeezing adjacent particles.