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 overturned 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.