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http://dx.doi.org/10.14775/ksmpe.2019.18.3.059

Analysis of Particle Packing Process by Contact Model in Discrete Element Method  

Lyu, Jaehee (Department of Mechanical Design Engineering, Kumoh National Institute of Technology)
Park, Junyoung (Department of Mechanical Design Engineering, Kumoh National Institute of Technology)
Publication Information
Journal of the Korean Society of Manufacturing Process Engineers / v.18, no.3, 2019 , pp. 59-65 More about this Journal
Abstract
In many industries, particle packing is adopted quite frequently. In the particle packing process, the Discrete Element Method (DEM) can analyze the multi-collision of particles efficiently. Two types of contact models are frequently used for the DEM. One is the linear spring model, which has the fastest calculation time, and the other is the Hertz-Mindlin model, which is the most frequently used contact model employing the DEM. Meanwhile, very tiny particles in the micrometer order are used in modern industries. In the micro length order, surface force is important to decreased particle size. To consider the effect of surface force in this study, we performed a simulation with the Hertz-Mindlin model and added the Johnson-Kendall-Roberts (JKR) theory depicting surface force with surface energy. In addition, three contact models were compared with several parameters. As a result, it was found that the JKR model has larger residual stress than the general contact models because of the pull-off force. We also validated that surface force can influence particle behavior if the particles are small.
Keywords
Discrete Element Method; Powder Packing; Contact Model;
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