Abstract: In order to study the formation and penetration property of rod-like jet of eccentric sub-hemisphere liner shaped charge with foam, three eccentric sub-hemisphere liners are designed according to the equal mass principle, and X-ray imaging and penetration experiments are carried out. The formation effects and penetration capabilities of rod-like jets of different tapered eccentric sub-hemisphere liners are compared, and the optimal tapered liner mode for forming rod-like jet is acquired. The results show that the rod-like jet of the liner which is thick in top and bottom areas and thin in middle area has small slug, optimal formation effect, powerful penetration capability, and relatively homogenous penetration hole. The formation parameters of rod-like jet are studied by theoretical analysis, and the velocity and mass distribution of rod-like jet are obtained. Compared with traditional simple cone liner, the jet mass of the liner which is thick in top and bottom areas and thin in middle area is increased by 22%, and the tip velocity is increased by 10%.

Key words: ordnance science and technology, rod-like jet, eccentric sub-hemisphere liner, foam, penetration