Study On The Ballistic Characteristics Of High-speed And Spinning Special-shaped Projectile Penetrating Into Soil

The kinetic energy penetrating warhead is one of the main ways to attack the deep defensive fortifications.The kinetic energy penetrating warhead has small resistance to its shape and structure,and large kinetic energy,so it can break the surface of the target and penetrate into the depth of the target.After being detonated,it will cause major casualties to the personnel and materials in the defense fortifications.For the defensive fortifications buried in the ground,only through the surface soil protective layer,can the ground penetrating warhead penetrate the bullet proof layer mainly composed of reinforced concrete,and then damage the deep targets.To improve the ballistic stability of the ground penetrating warhead through the soil layer is an important prerequisite and technical means to improve the damage efficiency of the ground penetrating warhead hitting deep buried fortification.Optimizing the missile body structure,especially the head shape,and reducing the deflection angle in the process of penetrating into soil are the main means to improve the ballistic stability of the the ground penetrating warhead.However,there are few researches on soil penetration and relevant research results are lacking.It is of great scientific significance and engineering application value to study the dynamic process of the penetration of high-speed and spinning special-shaped projectile into soil,explore the penetration mechanism of projectile,analyze the main factors affecting the ballistic characteristics and reveal the penetration law of shaped projectile into soil.In this paper,the ballistic characteristics of high-speed and spinning special-shaped projectile penetrating into soil are studied systematically by means of experimental research and numerical simulation.The specific research contents are as follows:First of all,the penetration test of high-speed and spinning special-shaped projectile into soil was carried out.With 57 mm anti-aircraft gun as launch platform,two kinds of shaped projectiles were tested for high-speed penetration into soil.The initial penetration velocity and depth data of the projectile,the damage characteristics of the front plank of the target,the cratering of the projectile and the recovery of the projectile are obtained through the test,which provides the basis for the establishment of the numerical analysis physical model and the reliability verification.Secondly,the physical model of high-speed and spinning special-shaped projectile penetrating soil is studied.The physical model of high-speed and spinning special-shaped projectile penetrating soil target is established,different soil constitutive models and parameters are selected,and calculation parameters are set up.Then,the sensitivity of soil constitutive model parameters is analyzed by comparing the deviation between the calculation results and the test values of the physical model of cone shaped projectile penetrating soil of different soil constitutive models,and a reliable soil constitutive model and key materials are established Parameters provide a solid foundation for the simulation analysis of the main factors affecting the ballistic characteristics.Finally,the influencing factors of the trajectory characteristics of the projectile penetrating into soil are studied.First,the penetration effect of projectile and soil is analyzed.Then,the influence of different initial angle of attack,initial velocity and spin angular velocity on the ballistic characteristics of projectile penetrating soil is studied by numerical simulation.The influence of projectile type on the ballistic characteristics under the same initial condition is compared and analyzed.