Abstract
AbstractPowder compaction of granular material plays a substantial role in the manufacturing process of ceramics industry and powder metallurgy industry. The compaction behaviour is ruled by granular flow and densification of deformable particles. Discrete element method (DEM) allows to investigate the powder compaction process numerically on the microscale by modeling the forces on the particle level and simulating the particle motion. Three‐dimensional data about particle size distribution and spatial structure of the particle packing can be extracted from micro‐computed tomography (µCT). An average stress tensor can be computed from DEM results, evaluating the contact forces and the distances from the particle center to the contact point with respect to an average cell volume. A weighted Voronoi tesselation of the polydisperse particle assembly is proposed for mapping a cell volume to each individual particle. With this approach all structural information of the particle system can be transferred from a discrete particle model to a heterogeneous volume model of micro‐structure. Discrete stress distributions for uniaxial powder compaction are presented. (© 2017 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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