Deformation Of A Powder Bed During Deep Penetration
JOURNAL OF ADVANCED MANUFACTURING SYSTEMS(2008)
摘要
The flow pattern of loose powders indented by a rigid punch in an open cylindrical die was studied using the discrete element method (DEM) and the finite element method (FEM) using the Drucker-Prager/CAP material model. The results are compared with those obtained through X-ray microtomography studies of particle movement during the deep penetration of a granular material. The density distribution of the granular material and trajectories of the particles during the deep penetration of the punch are analyzed. It is observed that in the vicinity of the punch, several kinds of flow patterns occur simultaneously, and the shear produces a relatively low density. Typical particle displacement and particle density distributions can be observed in both the numerical simulations and experimental studies. This study demonstrates that DEM and FEM can capture the main features of the powder flow behaviour during low-pressure compaction.
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关键词
Powder metallurgy, finite element method, discrete element method, compaction
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