2011 Volume 5 Issue 4 Pages 164-178
The dynamic behavior of granular media subjected to projectile impact was numerically investigated using a discrete element method (DEM). Specifically, the effects of the impact angle on the dynamic phenomena of projectile and granular media were examined. In general, after impact, a projectile either penetrates, rebounds, or moves horizontally depending on the impact angle of the projectile. The velocity histories of projectiles after impact for penetration and rebound differed. The impact angle did not affect drag force histories. The drag force histories of projectiles had ƒ-0.4 and ƒ-2.7 spectra. We have presented the probability distribution of the scattered velocity of granular media. When projectiles rebounded from granular media, the angle distribution of scattered granular media in the horizontal plane was butterfly-like. The impact angle did not affect the angle distribution of scattered granular media in the vertical plane. The granular media scattered in an elevation angle region of 40-60° regardless of the impact angle.
