Multiscale modeling of friction contribution into rigid-die pressing of metal powders

Abstract

Article is aimed at theoretical analysis of friction contribution into pressing of two-level axisymmetrical parts from metal powders by Direct Multiscale method of modeling. This method is based on simultaneous numerical modeling of mesoscopic and macroscopic powder consolidation where mesoscopic structure of the powder compact is defined through the set of mesoscopic unit cells distributed in the volume of the powder compact. Unit cells describe powder packing in different parts of the specimen and modeling predicts both consolidation of these cells and evolution of macroscopic parameter like porosity and damage. Comparison of theoretical and experimental data shows that even simple modeling of mesoscopic structure by cubic packing of powders gives plausible results for porosity and damage distribution after pressing without any additional phenomenological assumptions.