高速杆式弹丸三维数值模拟

 应用LS-DYNA动力学分析软件对变球缺型罩装药结构下高速杆式弹丸的形成过程进行数值模拟研究，揭示了其成型机理，并研究了中心点起爆、四点同时起爆和环形起爆等三种起爆方式对高速杆式侵彻体的成型和性能参数的影响，得到了弹体的速度分布。数值计算结果显示：变球缺型罩装药结构能形成速度高、长径比大、质量分布合理的高速杆式侵彻体，其成型机理兼有聚能射流和翻转型爆炸成型弹丸的特点，即上半部罩微元直接向轴线压合，下半部罩微元向轴线压合时逐渐向后翻转变形。不同起爆方式下所形成的高速杆式弹丸的形状和性能参数有所不同，其中环形起爆所形成的弹体性能参数最优。实验结果所反映的起爆方式的影响规律与数值计算结果是一致的。

Three-Dimensional Numerical Simulation of the High Velocity Rod-Shaped Projectile

The software of LS-DYNA was applied to simulate the formation process of a high velocity rod-shaped projectile from the modified hemispherical liner.Its formation mechanism was analyzed.It was demonstrated that the initiation methods such as center point initiation,four-point initiation and peripheral initiation had an effect on the formation and the performance parameters of the high velocity rod-shaped projectile.The results of numerical computation indicate that the shaped charge with the modified hemispherical liner can form the rod-shaped penetrator with high velocity,large slenderness and rational mass distribution.Its formation mechanism combines that of the shaped jet and the over-turned explosively formed projectile,i.e.the upper half of liner directly collapses along the axial line and the lower half of liner is gradually overturned when closing the axial line.There are some differences of the shape and performance parameters of the rod-shaped penetrators formed under the different initiation methods.The peripheral initiation is the best excellent initiation method.The experimental result shows a good agreement with results of numerical simulations.