Study On The Penetration Of A Loaded Armor-piercing Projectile Into A Finite Thickness Target

With the improvement of modern protection technology,traditional projectile cannot meet the target killing index.The ultra-high speed kinetic energy missile developed abroad in recent years has achieved the long-range,large power and high precision tactical index,while the domestic research results related to ultra-high speed kinetic energy missile are extremely rare.Therefore,The research of hypervelocity kinetic energy missile has great theoretical significance and engineering application value.In this paper,the ultra-high speed kinetic energy missile is taken as the research background,and the problem is simplified to the penetration problem of the loaded rod-type armor piercing projectile.The increase of the load will have a great impact on the penetration result,so the influence of the load on the kinetic energy of the penetration rod during the penetration process is analyzed.The research mainly adopts the numerical simulation method,and part of the research adopts the scaled test.Firstly,numerical simulation is used to compare the penetration results of bare rod and loaded penetration.The results of the two are quite different,and the classical penetration depth prediction formula is only applicable to the traditional shell piercing projectile but not to the loaded piercing projectile.It also shows that the influence of load cannot be ignored.Secondly,the process of oblique penetration of loaded armor-piercing projectile is divided into stages.Assuming that the projectile’s attitude does not change during oblique penetration and reaches the optimal penetration state,the force analysis of projectile at each stage is carried out,and the motion equation of the center of mass of loaded armor-piercing projectile is established.Based on the classical A-T model and cavity expansion theory,the influence factor of load is added.The prediction model of oblique penetration depth of loaded projectile was established,and the accuracy of the model was verified by simulation.The simulation results were lower than the theoretical model,but the trend was consistent.Finally,the influence of the load on the target Angle under the medium high speed(the speed is less than 1300m/s)is analyzed by experiments.Then,the working condition under the high speed(the speed is between 1300m/s～2000m/s)is simulated by numerical simulation,including changing the position of the load,changing the Angle of the target,changing the Angle of attack and changing the load material.The results show that the impact of load on penetration is not significant when the target Angle is less than 45°at medium-high speed.At high speed,the farther back the load is,the greater the penetration power is.When the target Angle is 30°,the penetration effect is better.When the Angle of attack is-1°～ +1°(≠0°),the projectile with load is in the range of favorable Angle of attack.The load material should be selected with high specific strength and stiffness,which can reduce the negative impact of the load.