3-D simulation of magnetic particles' behaviour during compaction in a magnetic field

Kitahara, Harunori; Kotera, Hidetoshi; Shima, Susumu

doi:10.1016/s0032-5910(99)00239-9

Cited by 18 publications

(4 citation statements)

References 3 publications

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“…Largescale Atomic/Molecular Massively Parallel Simulator. DEM has been used for simulation of magnetic particles placed in external magnetic field in a magnetic brush development system adopted in high-speed electrophotography machines [26,27] and in the permanent magnet production to study the magnetic alignment of powders [28][29][30]. Kitahara et al investigated the influence of the axial, transverse and isostatic pressing on the degree of alignment of spherical and non-spherical particles constructed from parts of two spheres.…”

Section: Numerical Simulation Of the Alignmentmentioning

confidence: 99%

Pressless process in route of obtaining sintered Nd–Fe–B magnets

Попов

Golovnia

Быков

2015

Journal of Magnetism and Magnetic Materials

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Section: Numerical Simulation Of the Alignmentmentioning

confidence: 99%

Pressless process in route of obtaining sintered Nd–Fe–B magnets

Попов

Golovnia

Быков

2015

Journal of Magnetism and Magnetic Materials

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“…Martin et al (2003) showed that DEM results were consistent with micromechanical models (described in Section 4.2) for isostatic loading (which assume af fine motion of the particles), but with differences occurring as the shear strain is increased. More material-specific applications included metallic powders (DeLo et al, 1999), detergents (Samimi et al, 2005), magnetic materials (Kitahara et al, 2000) and pharmaceutical powders (Hassanpour and Ghadiri, 2004).…”

Section: Discrete Element Modelsmentioning

confidence: 99%

Modelling of powder compaction

2003

Metal Powder Report

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Die compaction of powders is a process which involves filling a die with powder, compression of the powder using rigid punches to form a dense compact, and ejection from the die. The choice of powder composition and selection of process parameters determine the microstructure and final properties of the compacts. The practical issues in the powder-forming industries (powder metallurgy, ceramics, hard metals, pharmaceuticals, detergents, etc.)

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“…The DEM simulation is also useful for cases that particles move long distances in a complex mold, such as in recently-developed Computer Numerically Control (CNC)-press procedures. There have been some reports on the DEM simulation of powder compaction [6][7][8]. However, most of the simulations were conducted by assuming that elastic force calculated based on Hertzian contact theory [9] acted at each contact.…”

Section: Introductionmentioning

confidence: 99%

Model Simulation of Powder Compaction by Complex Mold Based on Deformation Behavior of Free Particles Measured by Compression Test

Hashimoto¹,

Sun²,

Park³

et al. 2002

MRS Proc.

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Discrete element method (DEM) is one of the excellent procedures for model simulation of behavior of granular assemblies. A two-dimensional DEM simulation of powder compaction by a complex mold was conducted by considering the deformation behavior of individual particles measured by a compression test of free particles. Spherical copper particles were used as a model material in this study. The particles (particle size ranges from 38 to 125microns) were individually compressed between parallel platens to measure compressive load and displacement in the loading direction. From the measured load and displacement data, force-displacement relations at contacts between the particles, and between the particles and mold wall were determined. In the simulation, the two-dimensional complex mold consisting of three stages (upper stage:3-mm wide and 1-mm deep, middle stage:2-mm wide and 1-mm deep, lower stage:1-mm wide and 1-mm deep) was charged with the copper powder consisting of spherical particles with size range of 50 to 200microns and was pressed under four press conditions. Forces at all contacts were calculated by using the determined force-displacement relations and each particle's position was traced by solving equations of motion for each particle. Pressure at each wall of the mold and density distribution in the powder compact were calculated as results of the simulation. It was found that the increase in the pressure at each wall corresponds to the increase in the density of the powder near the wall.

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3-D simulation of magnetic particles' behaviour during compaction in a magnetic field

Cited by 18 publications

References 3 publications

Pressless process in route of obtaining sintered Nd–Fe–B magnets

Pressless process in route of obtaining sintered Nd–Fe–B magnets

Modelling of powder compaction

Model Simulation of Powder Compaction by Complex Mold Based on Deformation Behavior of Free Particles Measured by Compression Test

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