Research on formation and penetration characteristics of linear shaped charge jet

The finite element code and fluid-solid coupling algorithm are used to study the formation and penetration characteristics of linear shaped charge jet. The influences of apical angle and wall thickness of liner and standoff are calculated and analyzed in detail. The results show that the jet becomes shorter and wider with the increase in apical angle and wall thickness of liner. In the study, the increased apical angle can get smaller tip velocity, higher tail velocity and smaller velocity gradient. Moreover, if the wall thickness of liner is increased, the smaller tip velocity, tail velocity and velocity gradient can be obtained. If the apical angle is the same, the cutting depth is almost increased linearly before an optimal standoff while it is exponentially decreased after an optimal standoff, whereas the cutting width is scarcely varied. Under the condition of the same standoff, the liner thickness has little effect on the penetration characteristics. Compared with apical angle and wall thickness, the standoff has more significant effect on penetration ability. The cutting depth is the largest at 3 mm standoff, and the cutting width is the largest at 0 mm standoff.