Simulation study on the jet formation and penetration of aftereffect enhanced shaped charge

In order to reveal the aftereffect damage enhancement to armored targets, the jet formation of biconical Ti-Hf composite reactive liner shaped charge and the penetration behavior of steel target are studied by numerical simulation. The effects of cone angle, height ratio and standoff of biconical liner on jet formation and penetration performance were analyzed. The numerical simulation results show that the effective jet formed by the biconical Ti-Hf composite reactive liner shaped charge is more concentrated than that of the single-cone Ti liner shaped charge, and the maximum velocity in the head and the average velocity in the middle of the forerunning penetration jet are increased by about 23.5% and 13% compared with the single-cone Ti liner shaped charge. When the cone angle α=50° of Hf liner, with the increase of the cone angle β of the forerunning Ti liner, the velocity distribution of the composite reactive jet along the axial direction shows a gradual downward trend, and the maximum velocity of the following reactive projectile shows an upward trend; With the increase of the height ratio of the biconical composite reactive liner, the velocity distribution of the forerunning penetration jet along the axial direction gradually increases, and the maximum velocity of the following reactive projectile gradually decreases. When the cone angle α=50°, β=80° and the height ratio H 1:H 2=2:3 of the biconical composite reactive liner, the penetration depth increases with the increase of standoff, but when the standoff exceeds 3.0CD, its influence on the penetration depth is significantly weakened.