Theoretical Model and Numerical Study of Shaped Charge Jet Penetrating into Thick Moving Target

An attack mode using shaped charge jet is proposed to effectively intercept and destroy the incoming high-speed missiles and earth-penetrating projectiles with large wall thickness. Based on virtual origin theory, an infinitesimal method is used to divide the interaction process of shaped charge jet and thick moving target into two stages: undisturbed jet penetration and disturbed jet penetration. At the undisturbed jet penetration stage, the jet is not be disturbed by lateral force on target plate. The penetration depth contributed by undistributed jet and the aperture of cavity were analyzed. At the disturbed jet penetration stage, the jet is disturbed by lateral force on target plate. The models of lateral drift velocity and penetration depth of distributed jet were established. A 40 mm-diameter shaped charge was designed to verify the theoretical model. The penetration depth of jet penetrating into steel target at the transverse velocity of 0-600 m/s was calculated using the LS-DYNA software. The theoretical results of the proposed model were compared with the experimental data in Ref.[17]. The results indicate that the shaped charge warhead is an effective means to strike high speed moving target. The higher the moving speed of target is, the shorter the elapsed time at the undisturbed jet penetration stage is, the more the interference of jet is, and the smaller the penetration depth is. © 2019, Editorial Board of Acta Armamentarii. All right reserved.