NUMERICAL SIMULATION OF DENSIFICATION OF HETEROGENEOUS RANDOM POWDER PARTICLEs WITH NON-EQUAL DIAMETER

Abstract

This article builds the mathematical model of randomized 3D particles using a Python program to study the densification behavior of heterogeneous powder particles of non-equal diameter under pressure. The Python interface reserved by the finite element software Marc was applied to compile relevant command files and link them to carry out the numerical simulation of powder particle densification. The principles of particle distribution, deformation, and nodal flow were obtained by analyzing the powder particle compaction outcomes. The impact of particle parameters, compaction temperature, and coefficient of friction on the relative density of compacts was investigated. The results of the simulation show that the powder particles in the mould cavity are spiraling. Cu particles form concave arcs and cylindrical arcs at contact points, and the node trajectories rotate from top to bottom and from the center to the periphery. The overall deformation of Cr powder particles is not obvious. In the pressing process, the larger the powder particles, the greater the degree of deformity. As the temperature in the cavity increases, the relative density decreases. The higher the cavity friction, the higher the relative density, but once it reaches a certain value, the relative density reduces. The relative density of compacts can be greatly enhanced by selecting soft powder particles with a larger size, a higher temperature cavity, and a certain value of friction force. The experimental results verify the accuracy of the simulation, which is an important benchmark for numerical simulation of randomized particle densification. The findings provide a theoretical basis for further improvement in the density and properties of heterogeneous metal doping.