Journal
ADVANCED POWDER TECHNOLOGY
Volume 32, Issue 5, Pages 1362-1368Publisher
ELSEVIER
DOI: 10.1016/j.apt.2021.02.040
Keywords
Discrete element method; Cohesive powder; Bimodal particle size; Packing structure; Compression
Categories
Funding
- Japan Society for the Promotion of Science (JSPS) [18H01769]
- [20505]
- Grants-in-Aid for Scientific Research [18H01769] Funding Source: KAKEN
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The study found that an increase in particle size ratio can reduce void fraction even in the presence of cohesive particles. Cohesive force decreases contact number, especially between coarse particles.
In this study, the compression characteristics of bimodal cohesive particles were investigated using a discrete element method (DEM) simulation. The compression and packing processes were simulated under different conditions of size ratios of 1-4 and fine particle mixing ratios of 0-0.5. The cohesive force was expressed using the surface energy proposed by the Johnson-Kendall-Roberts (JKR) cohesion model having a surface energy of 0-0.2 J/m(2). The calculated results demonstrated that even in the case of cohesive particles, an increase in the particle size ratio reduced the void fraction of the powder bed during the packing and compression processes. In addition, it was found that the cohesive force decreased the contact number, especially the coarse-coarse contacts, although it had little impact on the void fraction. Our DEM simulations suggested that it is necessary to evaluate the contact numbers even under similar void fractions, which will be essential in the case of different material mixtures, such as all-solid-state batteries. (C) 2021 The Society of Powder Technology Japan. Published by Elsevier B.V. and The Society of Powder Technology Japan. All rights reserved.
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