Numerical simulation and influential factors analysis of density distribution in High Velocity Compaction

摘要

Discrete Element Method is applied to study the process of powder densification in High Velocity Compaction. Assuming that powder is formed by viscoelastic metal particles, the contact model of particle flow and the equation of motion of each particle are established, and constitutive model of viscoelastic powder in High Velocity Compaction described by force-displacement is deduced in detail. Based on the software PFC-2D, the processes of the two-dimensional particle flow and density distribution during High Velocity Compaction are simulated. The numerical simulation results correlate reasonably well with experiments which also indicate that the density distribution is affected by friction coefficient, height-diameter ratio and two-directional compaction loading.