Research on damage effect of penetration and explosion integration based on volume filling method

Abstract

It is difficult to distinguish the damage effects of penetration and explosion loads in the test of projectile penetration and explosion integration. At present, there is no mature method to simulate the whole process of projectile penetration and dynamic explosion integration. To solve this problem, a numerical simulation method of projectile penetration and explosion integration based on the volume filling method is proposed, the explosive material is generated by volume filling in the background grid (ALE), and given the same initial velocity as the cartridge case. The fluid-structure coupling algorithm is set to restrict the cooperative deformation and movement of the cartridge case and the explosive, the static or dynamic explosion occurred after the cartridge case and the explosive penetrate the target medium synchronously. The empirical formula is used to verify the model of the inert projectile penetration process, and the numerical simulation of the whole process of penetration and dynamic explosion integration and penetration and static explosion integration is completed. The change rule of the medium internal pressure field, surface crater, and crater depth are given, and the damage effects of penetration and explosion loads in the process of penetration and explosion integration are quantitatively analyzed. The results show that: when the penetration and dynamic explosion integration, the non-dissipated penetration wave field in the target medium will be superimposed with the explosion shock wave field, and the pressure peak is higher than that of the single explosion wave field of charge static explosion after penetration, but it is not obvious; When the penetration and dynamic explosion integration, the dynamic explosive effect of the explosive makes the explosion shock wave field in the medium present an irregular spherical distribution, which has an influence that can not be ignored. When the target velocity is fixed, the later the initiation time is, the smaller the surface crater is and the greater the crater depth is; In the case of fixed initiation depth, the greater the target velocity, the smaller the surface crater, and the greater the crater depth.