3-D Simulation of Compaction Behavior of Copper Powder Based on Particular Modeling

Simulation of compaction of copper powder is carried out in three-dimensions based on a particulate modeling. Besides elastic deformation of particles, a model of plastic deformation is introduced based on micro-compression of spherical particles; since the pressure required to achieve certain density by simulation without taking account of plastic deformation of particles is much higher than the experimentally derived one, it is concluded that it is necessary to introduce its effect. Simulations of closed-die compaction, isostatic compaction and three-dimensional compaction, where powder is capable of being compacted with arbitrary strain ratios, are performed for powders of copper particles. It is thus shown that relationship between pressures and density ratio and also constitutive behavior during compaction obtained by the simulation agree qualitatively well with experimental results. Quantitatively, however, the pressure for a particular density ratio is about a half of the experimentally derived one. The reasons are discussed and technical issues for overcoming the problems are suggested.