Research on Effect of Initiation Detonation Method on Fragment Velocity Distribution

To enhance the damage effect of focusing warhead, the investigation about the scattering behavior of focusing warhead is conducted. Based on the momentum method and the detonation wave theory, the influence of initiation detonation methods and curvature radius of the charge on fragment velocity is analyzed. The fragments velocity distribution models of the end-initiated, the center-initiated and the two ends-initiated are obtained. Numerical simulation shows that fragments velocity distribution and the propagation of the detonation wave of numerical simulation results have a good fit with the theoretical model. It is shown that fragments velocity is higher in the middle and low on both sides. When it was end-initiated, the location where the fragment velocity reaches the maximum was 18.6cm from the initiation end. When it was center-initiated, the maximum fragment velocity appeared at the center of the projectile axis. When it was two ends-initiated, the maximum fragment velocity appeared symmetric about the center line of the projectile axis. With increasing of the curvature radius of the circular charge, the maximum velocity of the fragments increased.