Numerical Simulation Of Penetration Performance Of N-shaped Armor Plate Anti-piercing Projectile

The emergence of anti-armor weapons with strong functions,large power and various types makes the armor protection requirements for military vehicles and special-purpose civilian vehicles more and more high.High-performance protective armor has become a hot research topic at home and abroad.Among them,anti-ballistic penetration is one of the focuses of armor protection research.In this paper,an N-shaped structural armor plate(referred to as "N-shaped plate")consisting of an orifice plate,a sloping plate and a substrate is proposed,and the elastic resistance of the 7.62 mm armor-piercing projectile is studied by numerical simulation.Firstly,the geometric model and finite element model of N-shaped armor plate and 7.62 mm small-diameter armor-piercing projectile are established by UG and HYPERMESH software respectively.By establishing the finite element model of the projectile,the experimental results in the literature are verified from the residual velocity of the bullet,the deformation mode of the target and the penetration depth.The numerical simulation method is verified.Secondly,the anti-ballistic penetration performance of N-shaped plates is simulated and analyzed.The anti-ballistic mechanism of N-shaped plates is analyzed from two aspects: bullet motion attitude and target damage mode.According to the structural characteristics of the Nshaped plate,the anti-ballistic effect of the N-shaped armor plate under different impact points is studied.It is found that when the impact point is located on the upper side of the hole edge,the protection effect is the best;when the impact point is at the center of the hole,the protection effect is the worst.Thirdly,a new type of tapered orifice plate is proposed,and the deflection angle and residual velocity of the bullet are used as the evaluation index.The elastic properties of the circular orifice and the square orifice plate are compared.It is found that the new orifice plate has certain advantages.Based on this conclusion,the tapered orifice plate is applied to the Nshaped plate;under the same incident condition.Compared with the original N-shaped plate,the residual speed and kinetic energy of the bullet after penetration are lower,indicating the elastic resistance of the new tapered armor plate.Can be better.Finally,based on the ballistic limit and ballistic protection efficiency,the elastic properties of the new tapered armor plate are further evaluated.The two macroscopic structural parameters of the N-shaped armor plate are analyzed,namely the thickness ratio of the three plates and the inclination angle of the inclined plate,which are resistant to the elastic energy.The results show that when the total thickness is different and the thickness ratio is different,the penetration path and force of the armor-piercing steel core are different,and the structural elastic resistance is different,and the elastic resistance is the most when the thickness ratio is 3:2:4.excellent.The greater the inclination of the swash plate,the better the elastic resistance;when the inclination is greater than 45 degrees,the steel core cannot penetrate the target at the set initial speed.The new armor protection structure proposed in this study has certain value in vehicle armor protection applications.