Exploration of die wall friction for powder compaction using a discrete finite element modelling technique

Abstract

The paper presents a micromechanical discrete-element modelling technique to investigate the friction mechanisms that are present between the powder and tool set surfaces in die compaction. The technique includes particle kinematics and deformations to be accounted for together and has allowed a theoretical exploration into particle sliding over smooth surfaces and locking into the asperities of rough surfaces. A two-dimensional model has been developed to represent a shear-plate technique that is used to measure friction in compacted powder systems and in this study assumes that the consequent cylindrical rods are of identical diameter.