Simulation of dynamic compaction of metal powders

Abstract

This article presents numerical studies on the deformation of particles during dynamic compaction of metal powders. The analysis of the process is based on a micromechanics approach using multiple particle configurations. The material considered is elastoviscoplastic with interparticle friction. Two-dimensional studies on particles in close packed arrangement were carried out using plane strain conditions for deformation and thermal response. The finite element method using an explicit dynamic analysis procedure was used for the simulations. The influence of speed of compaction, strain hardening, strain rate dependency, interparticle friction and size of the powder particles on the final shape and temperature variations within the particles were analyzed. The studies offer useful information on the shape and temperature variations within the particles. The results provide a better understanding of the dynamic compaction process at the micromechanics level.

Mesoscale simulation of the configuration-dependent shock-compression response of Ni+Al powder mixtures

“…The particle-scale details of shock-compression in metal powder-based systems is thus, traditionally investigated through computational simulations [10][11][12][13]. In many cases, these simulations have relied upon idealized particle geometries and/or distributions.…”

Green Body Behaviour of High Velocity Pressed Metal Powder

“…A number of investigations of the High Velocity Compaction (HVC) process have been published in recent years [1][2][3][4][5]. All publications indicate that high-density components can be obtained using HVC.…”

Energy partitioning within a micro-particle cluster due to impact with a rigid planar wall

“…Our predictions are also consistent with the reported computational results of others. For example, the compaction simulations of Kumar et al [17], for a small number of initially circular, 2-D metal particles, predicted frictionally induced temperature rises of 1,500-4,700 K near contact surfaces due to 500 m/s impact, with much lower temperature rises within the interior of particles. Further, Menikoff [25] predicted compaction induced maximum local temperature rises of approximately 100 and 200 K within 2-D, HMX particles in the absence of friction for an impact speed of 200 and 500 m/s respectively.…”

“…(17)] are simultaneously integrated using an implicit, forward Euler method to estimate b e,n and p,n . For linear isotropic hardening (i.e., for constant h), the true elastic stretches are given by…”