FLIGHT AND PENETRATION BEHAVIORS OF TANDEM EFPS WITH FINS

Based on the principle of kinematic similarity and stabilization storage of a projectile, the flight stability characteristic of a tandem explosively formed projectile (EFP) formed by a shaped charge with double-layer liners and a hexagonal shell was investigated by simulation and theoretical analysis. The damage to multilayer interval steel plates impacted by the tandem EFP with empennages was also studied. Five types of hexagonal shell with representative thicknesses of 0.4, 0.8, 1.2, 1.6, and 2 mm were used. The results show that the hexagon shell has a significant influence on the shock wave propagation direction and time, causing the liners to suffer a periodic impulse and warp regularly at the edge. Finally, the tandem EFP forms three pairs of symmetric fins, which ensure that the EFP flies steadily in the air. The hexagonal shell thickness has an important influence on the formation, flight, and penetration of the tandem EFP. As the hexagonal shell thickness increases gradually, the length:diameter ratios of the tandem EFP decrease correspondingly, and the forerunning and following EFPs have a greater speed difference, causing a larger interval distance as the two EFPs fly steadily in the air. Moreover, the interval distance between the two EFPs plays a crucial role in penetrating the multilayer plates.