Damage Effect Of Fragment On Metal Thin Target And Shielded Explosive At 2-3km / S

With the development of science and technology, the development of air combat platform is also very quickly. The incoming missiles, helicopter gunships have strong deterrent, including the supersonic missile increasing attention in various counties. How to intercept aerial gunships and supersonic missiles has become an important research topic in various countries. There are two methods to intercept and destroy the hypervelocity cruise missiles. One way is to use the hypervelocity projectile impact missile internal electronics. Another method is to use the hypervelocity projectile impact missile propellant, make the internal explosive explosion. The essence of these two methods is hypervelocity projectile damage the metal thin target and the shielding explosive.Currently, the research about hypervelocity impact was mainly on the field of aerospace, and the velocity is more than 3km/s. The research of low velocity was also basically under 2km/s, but the velocity between 2km/s and 3km/s was rarely been studied. In this paper, we use numerical simulation, theoretical calculations and experimental method to study the damage effect on metal thin target and shielding explosives under this speed segment.The result shows that the ductility hole will be formed when projectile vertical impact the target. When we use the projectile vertical impact steel target plate, the projectile upsetting deformation will be occurred. The projectile size increased 8.75% compared to the original. While in the low-speed segment, perforation diameter formed on the target plate was almost the same as the diameter of the projectile, none ductility hole was formed. When projectile vertical penetration the target, the diameter of hole formed on steel was bigger than aluminum. For shielded explosives impact initiation problem, theoretical calculation and numerical simulation are in good agreement and error was less than 5.98%.It shows that the established theoretical calculation method is effective. Under the same conditions, the tungsten alloy fragment is better than steel and copper about the critical detonation velocity. With the increase of the incident angle and the target thickness, the critical impact initiation velocity also increased.