Numerical simulation of magnetic pulse radial compaction of W-Cu20 powder with a field shaper

Abstract

The magnetic field in a magnetic pulse radial compaction process was analyzed in ANSYS/Multiphysical software to determine the electromagnetic force distribution on the driver tube. The node electromagnetic forces were then imported into the structure field as a boundary condition in ABAQUS/Explicit software. A modified Drucker-Prager Cap model was then established to reproduce the compaction behavior of W-Cu20 powder by writing a VUSDFLD subroutine. The Cowper-Symonds constitutive model was used to describe the deformation behavior of the driver tube, the pack tube, and the nylon terminal. Finally, the results predicted by numerical simulation were verified by experiment. The velocity, pressure variation, final distribution of relative density, and relative density uniformity during the magnetic pulse radial compaction process of W-Cu20 powder with a field shaper were predicted by the model, and the effect of field shaper on the relative density was analyzed. The results validate the numerical simulation model of magnetic pulse radial compaction. The magnetic pulse radial powder compaction with a field shaper can significantly increase the compacted compound density with the condition that the inner diameter height of the field shaper is greater than the powder filling height. Although the slit of the field shaper can cause an uneven density distribution after compaction, in the effective range of the field shaper, the density unevenness is minor under the described conditions, less than 4.1%.