| Based on the electromagnetic railgun, a new projectile assembly structure is designed. Electromagnetic force distribution characteristic of sabots is analyzed during launch to get suitable structures. On this basis, the dynamic contact between projectile and sabot is studied by Ls-Dyna. It used variable gap tooth technology, and the value of each tooth gap was calculated theoretically. The penetrators and sabots are optimized based on the results. Simulation results shows that each tooth stress level of penetrators tend to average.Secondly, the experiment and simulation of long rods penetration into semi-infinite steel targets are analyzed. Based on the results, substantial relation between penetration depth and impact velocity is got by experimental way. The process of high speed impact between (1000-2500)m/s is simulated by Autodyn codes. Penetration rules is got.Finally, based on the experimental results, the results of each model to calculate penetration depth are compared to fit the high speed penetration issue. Using energy conservation methods, the relationship between impact velocity, pressure and material parameters is got. The crater diameter calculation model deduced by HeYu is introduced. It is modified by applied radial force expression of cavity expansion theory. By comparing with the experimental results, the penetration depth and crater diameter results agree well with the actual measurements. |
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