摘要
A simple gravity drop experiment was run to investigate plastic deformation of powder aggregrate sprayed on a hard ball under impact of another free falling hard ball and measure coefficient of restitution and plastic strain of powder aggregate. Experimental results show that coefficient of restitution and plastic strain of powder aggregate increase as the velocity of ball increases and initial height (h 0) of powder aggregate has great effects on plastic deformation of powder aggregate. At a higher initial height (h 0), much of kinetic energy is dissipated is interparticle frictional work and coefficient of restitution is very small. Plastic strain of powder aggregate first increases as h 0 increases until a maximum value and then decreases as h 0 increases.
