Study of attitude deflection and trajectory yawing mechanism of concrete wedge-water layer combination structures for long rod ogive-nosed projectiles

Abstract

To explore an efficient deflection yaw anti-penetration protection structure, based on the attitude deflection and trajectory yawing phenomena of the projectile penetration into the special shape structure and the non-ideal entry of the projectile into the water. A concrete wedge and water layer combination structure is proposed to protect against the penetration of the ogive-nosed projectile. Ballistic impact tests and numerical simulations were conducted on the concrete wedge-water layer combination structure to evaluate its resistance against long-barreled ogive-nosed projectile penetration. The study analyzes the changes in forces, attitude, and trajectory during the projectile's penetration of the concrete wedge and water, and identifies typical projectile damage modes. The results show that during the penetration process, the concrete wedge induces initial attitude deflection and trajectory yaw in the projectile, asymmetric erosion of the head and overall bending deformation. After entering the water layer, sustained asymmetric forces apply to the projectile, leading to further bending deformation, sustained deflection and yawing motion. As the initial velocity increases, the projectile exhibits three distinct deformation and damage modes: asymmetric surface abrasion, asymmetric head deformation, and head erosion combined with overall bending.