Experiment and Numerical Simulation on Oblique Penetrating Concrete Targets by a Special-Shaped Projectile with Ribbed Head

This paper is focused on a special-shaped projectile with ribbed plate head. In order to explore its penetration ability and trajectory stability, the 152 mm diameter light gas gun was used to launch projectiles to penetrate concrete targets of 300 mm thickness at different angles within the speed range of 250–350 m/s. In the meantime, numerical simulations of ogive-nose projectile and ribbed-head projectile perforating concrete targets with different velocities and inclination angles were implemented with LS-DYNA, and the simulation results are in good agreement with the experimental results. The experimental and simulation results show that oblique penetration will reduce the penetration ability and affect the trajectory stability of projectile. Under experimental conditions, the main damage of the target plate includes the open pit area and the shear plug area. The crater area will increase the attitude angle of projectile, while the caving zone will reduce the attitude angle. Compared with the ogive-nose projectile, although the penetration ability of the special-shaped projectile decreases due to the increase of the action area, the rib structure of the special-shaped projectile makes the missile body suffer less deflection moment when the projectile intrudes into the target, which makes the projectile body have an excellent anti-deflection effect and trajectory stability.