抄録
The dynamic behavior of projectiles upon impact with granular media was recorded using two high-speed video cameras for capturing different angles. We used eight types of spheres with diameters in the range of 6-20mm as the projectiles and three types of the granular media. Post-impact motion of the projectiles depended on the impact angles of the projectiles, the density ratio, and the diameter ratio and not on the impact velocity. On the basis of the area of the transient regions, an empirical equation was derived for determining the critical angle of projectiles as a function of the density ratio and the diameter ratio.
