Abstract
In this paper, we study the effects of punch speed and punch mass on the dynamic compaction of powders. First, simple theoretical calculations are made, and then, for a comparison, the strain during dynamic compaction of copper powders is measured by Moire method, using the high speed camera.
As a result, when the kinetic energy of each punch is equal to each other, following conclusions are obtained.
(1) During dynamic compaction, the higher the punch speed is, the higher the density is. But, after dynamic compaction, the lower the punch speed is, the higher the density is. These may be dependent on the properties of the shock wave and the viscosity of powders.
(2) Even though the kinetic energy of each punch is equal to each other, different punch speed leads to the different density distribution in the compacted powders. When the punch speed is low, the uniform density distribution is obtained.
