Oblique penetration law of short-rod projectile into thin metal target

The finite element model of oblique penetration of short-rod projectile into a thin metal target was established and the effectiveness of the model was verified to study the oblique penetration law of short-rod projectile into a thin metal target. The simulation calculation of short-rod projectile penetrating thin metal targets with different obliquities at different impact velocities was carried out. The simulation results show that the critical ricochet velocity of the projectile increased with the increase of the obliquity of the target plate, as well as the increment of the critical ricochet velocity of the projectile. With the increase in the obliquity of the target plate, the ultimate penetration velocity of the projectile increases exponentially, and when the obliquity is large, the ultimate penetration velocity increases sharply. When the projectile ricocheted without invading the target, the velocity attenuation of the projectile increased with the increase of the impact velocity, whereas the mass of the residual projectile decreased. However, when the impact velocity exceeds the ultimate penetration velocity of the projectile to the target plate, the velocity attenuation of the projectile decreased and the mass of the residual projectile increased with the increase of the impact velocity. With the increase of impact velocity, the included angle decreased gradually, and the decreasing trend also slowed down. When the impact velocity was just greater than the ultimate penetration velocity, the included angle was the largest. At the same impact velocity, the greater the obliquity of the target plate, the greater the included angle. This study is of great significance to reveal the critical ricochet and ultimate penetration of projectile, the velocity, mass, and trajectory change in the process of penetration, as well as the damage of projectile to the target plate.