Numerical simulation study on the matching of third-generation explosives and large-caliber reactive shaped charge

Abstract

In order to further study the matching problem between the third-generation explosives and the large-diameter active shaped jet charge, the jet forming characteristics and thermo-mechanical coupling characteristics were studied based on the AUTODYN-2D finite element analysis platform. The evolution behavior and distribution law of pressure field, velocity field and temperature field during the active jet forming process were analyzed, and the active jet forming law under different charge structures was analyzed. The numerical simulation results show that the large-diameter active energy-gathering structure under the condition of the third-generation explosive charge can form a stable active jet. With the extension of the jet forming time, the high-pressure zone and the high-temperature zone have obvious movement and diffusion phenomena. The high-speed zone moves from the middle of the axis to the head of the jet, resulting in a velocity difference between the head and tail of the jet. In addition, the penetration ability parameters of PTFE / AL active jet, such as head velocity and effective jet length, are significantly improved by the third generation explosives, especially CL-20 explosives, and are significantly affected by the charge type, the thickness of the active liner and the cone angle of the liner.