Eccentric Initiation Of Directional Warhead Fragment Velocity Distribution And Gain

This paper mainly studies the distribution of fragment velocity and density under off-center initiation by means of experiment, theoretics and numerical simulation. The enhancement regularities of the fragment velocity under different multiple initiations of off-center are also researched.The results indicate that the fragments of warhead are collected under off-center initiation but not very evident and the velocity of fragments is significantly affected by off-center initiation. In the opposite direction on initiation point, the fragment velocity is maximum and the enhancement can reach 24.7%. On both sides of this position, the fragment velocity is decreasing trend. The enhancement of velocity is basically not affected by the number of initiation point. It also shows that the farther the distance from initiation point to the center, the greater fragment velocity gains. One end of off-center initiation is superior to centre initiation. In the opposite direction on initiation point, fragment velocity increases clearly comparing with the center initiation. Off-center initiation of both ends is superior to one end initiation and fragment velocity is significantly higher than that under one end Initiation. Off-center line initiation and off-center initiation of both ends have similar impact on fragment velocity and the enhancements of velocity are also close to each other. The biggest enhancement is slightly lower than that under both ends initiation.To sum up, off-center initiation of both ends is the best option, followed by off-center line initiation, one end off-center Initiation is final.The results of this paper can provide a useful reference on engineering design for the warheads.