轴向增强战斗部端部惰性填充物对端部破片飞散特性的影响

In the current design of the dynamic damage field of the fragment warheads, the central blind area effect is regarded as an essential factor affecting the warhead damage efficiency improvement. The axially-enhanced warhead has become an important design means to eliminate the dynamic central blind area of the warhead, which attracts more and more attention from relevant researchers. In the present paper, based on the smoothed particle hydrodynamics (SPH) computation method, a series of numerical models for the shell breaking and fragment dispersion processes of axially-reinforced warheads with non-filler, polyurethane filler nylon filler and explosive filler, respectively, at the end under the explosive loadings are established, and used to study the influence of the characteristics of the fillers in the front of the warhead on the dynamic response of the shell. It is found from the numerical simulations that the filler has a significant influence on the velocity of the fragments in the front of the warhead but a minor influence on the dispersion angle of the fragments. The mechanism of the influence of the non-reactive filler on the fragment velocity is analyzed by comparing the velocity history curves of the specific fragments. The results show that the polyurethane foam filling can significantly delay the acceleration process of the explosive shock wave to the forward fragment and reduce the explosive load to a certain extent. The nylon filler can reduce the acceleration of the forward fragment and the acceleration of the lateral fragment to a certain extent. Thus, the explosion loading is guided to be evenly distributed around the circumference of the end position. Considering the synthesis of the involved velocity of the warhead, using low-density and low-mass filler instead of head charge has the same dynamic damage effect of improving the energy utilization efficiency of the axially-enhanced warhead. The numerical models established in this paper and the research finding can provide some reference for the dynamic damage field design of conventional fragment warheads.