Study On The Damage Effect Of The Penetration And Jet Of Energetic Armor Piercing Projectile On The Simulated Charge

When warships are carrying out combat tasks,underwater targets with insensitive charges launched and deployed by the enemy underwater are the main threat source of warships.How to achieve effective interception of underwater targets is an urgent problem in the military field of all countries.The armor-piercing projectile has the characteristics of high initial velocity,strong speed storage ability and strong anti-electronic interference ability.With its advantages of high speed and high accuracy,it can intercept or attack the target,which poses a fatal threat to the target’s charge warhead,instrument and equipment cabin and fuel power cabin.However,the underwater resistance of the projectile is large,and the velocity of the projectile is seriously attenuated when it hits the underwater target.Even if it hits and breaks through the underwater target shell,there is still a certain threat to the underwater target.Al/PTFE energetic material is a kind of special material that can store a large amount of energy and release energy rapidly through explosion or combustion under the stimulation of external conditions.The kinetic energy of the penetrator penetrates into the interior of the target,and the characteristics of the explosive combustion of energetic materials in the interior of the target can improve the damage to the underwater target.Based on this background,this paper takes the target damage of energetic penetrator equipped with self-powered ignition system and aluminum/polytetrafluoroethylene(Al/PTFE)energetic material as the research object,and uses the method of combining experiment,theoretical analysis and numerical simulation to study the damage effect of energetic penetrator penetration and flame on the simulated charge,It provides theoretical basis and experimental reference for the study of the comprehensive damage effect of the penetrator and flame of the energetic penetrator on the underwater target with insensitive charge.The main work and research results of this paper are as follows:(1)In view of the poor damage effect of ordinary armor-piercing projectile on underwater targets with insensitive charges,this paper designs a new type of energetic armor-piercing projectile,which can penetrate into the interior of the target by its own kinetic energy,and the energetic material in the interior of the energetic armor-piercing projectile is ignited by the action of the self-powered ignition device in the projectile and produces a high exothermic combustion and explosion reaction,And through the through hole designed by the warhead of the energetic armor-piercing projectile,the jet effect is formed and acts on the inside of the target,and the high temperature and overpressure generated will cause efficient damage to the target.PMMA material with mechanical properties similar to injection molding charge shall be selected to replace internal low vulnerability charge.(2)The experiments of penetrating aluminum plate and PMMA simulated charge target were carried out,and the numerical simulation research of penetrating aluminum plate and PMMA simulated charge target was carried out under different working conditions by using AUTODYN finite element software.The results show that when the velocity is between 100m/s and 250 m/s,the projectile is embedded in the aluminum plate by the target plate resistance and the friction of the aluminum plate.When the speed is greater than 250 m/s,the projectile can penetrate the aluminum plate.As the projectile penetrates inside the simulated charge,it gradually breaks around at the point of contact with the warhead.When the internal tensile strength of the simulated charge reaches 50 MPa,the material will fail and produce radial cracks.(3)The penetration experiments of energetic armor-piercing projectiles with different quality Al/PTFE energetic materials were carried out.The experimental results show that the penetration and flame of the energetic armor-piercing projectile enhance the damage effect of the simulated charge.On the basis of the crack generated by the penetration of the simulated charge,the high temperature and high pressure generated by the flame make the simulated charge further disintegrate,and the thermal decomposition phenomenon of the simulated charge at the bullet through-hole occurs.With the increase of charge quality,the duration of flame spray increases,and the damage degree of simulated charge increases.Combined with the static explosion experiment in free space with different charge mass and the static explosion experiment in closed space with different charge mass,the numerical simulation under the same working condition was carried out using AUTODYN finite element software and JWL equation of state,which verified the reliability of the numerical simulation.On this basis,the numerical simulation research on the internal flame of the simulated charge after the energetic penetrator with different charge quality penetrates the aluminum plate is carried out.The results show that it takes about 4～7 μs from the moment when the counterweight strikes the piezoelectric ceramic to the ignition of the ignition head μ s.The ignition head ignites the energetic material for 365 μs.The overpressure generated by the flame at the through-hole of the energetic armor-piercing projectile increases with the increase of the charge mass in the projectile,and the maximum overpressure can reach 1.914 GPa.The overpressure generated by the flame on the simulated charge can reach 1.136 GPa.Under the effect of the jet flame on the interior of the simulated charge,the internal stress value gradually increases to 0.83 GPa.The temperature rise produced by the energetic material spray flame gradually increases with the increase of the charge quantity.When the charge quantity is 3 g,the contact area between the energetic armor piercing projectile and the simulated charge reaches 5560 K.(4)The numerical simulation research on the penetration of the energetic penetrator into the aluminum plate and the target of the simulated charge was carried out under different impact angles.The results show that when the target angle is 30 ° and the velocity is greater than 200 m/s,the simulated charge can be damaged by the flame generated inside the simulated charge;When the target angle is 45 °,the velocity is greater than 250 m/s,and less than 300 m/s,the flame can damage the simulated charge;When the target angle is 60 °,the velocity greater than 400 m/s can enter the interior of the simulated charge,but due to the impact of the flame delay time,the energetic armor-piercing projectile has penetrated the simulated charge,and cannot cause flame damage to the simulated charge.