Transverse deflection of projectile obliquely penetrating into concrete

A high-speed video camera and a reflector system in front of concrete target were used to investigate experimentally the flight altitude of projectile before it impacts a target and the transverse deflection angles of the projectile by using 152 mm gas gun as a loading means. The velocities of projectile before impacting the target and the velocity variation and posture variation of the projectile during the cratering and slippage phases were obtained. A transverse deflection period concept was introduced to describe the basic mechanical behaviors of projectile in the initial cratering, slipping and penetration stages when it penetrated into the concrete. The relationship between the transverse deflection period and those characteristics was discussed. The depth of oblique penetration and the transverse deflection angle of a projectile can be suitably evaluated using transverse deflection period and dynamic cavity expansion model.