Abstract
In order to study the influence of parameters of sand under high-speed penetration into sand, we performed the impact experiments by using the powder gun within a velocity of 150-510 m/s. Grain size and packing density of sand were varied several kinds. Impact and penetration speed of a projectile were measured by coil method that is contactless. The behavior of projectile changed at transition speed and the acceleration of projectile was expressed two equations depending on the speed region. We also performed the measuring experiments of the elastic wave speed in sand by using Split Hopkinson Pressure Bar (SHPB) method to compare with the transition speed. It was found that the transition speed give a fairly good agreement with the elastic wave speed.
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