Numerical Simulations of Isostatic and Die Compaction of Powder by The Discrete Element Method

摘要

New constitutive equations must be formulated relating the micromechanical properties to the macroscopic ones to describe accurately the behavior of powders during a cold compaction process. To contribute to this new formulation, a Discrete Element Method (DEM) has been used to simulate the densification process of the powder microstructure undergoing compaction. However, the contact laws used in classical DEM formulation, do not reproduce correctly the evolution of the stress evolution during the compaction process. To overcome this limitation at a high density value (over 0.85), the change in local density is taken into account. The first numerical simulations using the open-source YADE software show a fairly good agreement for isostatic and die compaction of powder.