Thickness Equivalent Method of 921A and Q235 Steel Plate Based on the Similarity of Projectile Penetration Residual Velocity

Abstract

The penetration judgment of the projectile to the target is vital to evaluate its damage ability. Based on the similarity of projectile penetration residual velocity, the thickness equivalent model of plates with different materials is proposed in this paper. Simulation parameters are validated by physical experiments. Then a series of numerical simulations are carried out on 30CrMnSiNi2A projectiles penetrating 921A and Q235 steel target plates. Results show that with the increase of the plate thickness, the projectile residual velocity decays linearly, while the slope depends on the incident velocities. Simultaneously, the residual velocity conforms to a logarithmic growth as the mass of the projectile increases. Finally, the thickness equivalent relationship between 921A and Q235 steel plate is established by using the ratio of the material strength, the incident angle and the projectile shape coefficient. The proposed model can provide a reference to the general projectile penetration analysis.