Penetration Behavior of 12.7 mm Projectile into Semi Infinite 45 Steel

Aiming at the research on the penetration behavior of rigid oval short rod projectile to semi infinite thick steel target, the ballistic test of $\varnothing $12.7 mm projectile penetrating 45 steel at different landing speeds is carried out by using 12.7 mm ballistic gun. The penetration behavior of the projectile in the process of penetration is analyzed with numerical simulation. The results show that the critical cratering velocity of $ \varnothing $12.7 mm projectile to 45 steel is 75 m/s, and the core shows rigid penetration behavior in the range of projectile velocity. The increasing trend of penetration resistance of the core is basically the same under different impact velocities. When the impact velocity is greater than 400 m/s, there will be a constant resistance stage after the end of cratering until the end of the penetration. At the same time, the penetration depth of the standard projectile to 45 steel is linearly proportional to the target kinetic energy, and the relationship between the dimensionless penetration depth and the dimensionless kinetic energy is fitted.