Numerical Study and Theoretical Model of Shaped Charge Jet Penetrating Into Thick-Walled Target With Following Velocity

Abstract

In order to investigate the effect of the carrier’s initial velocity on the jet’s damage power, this paper conducted the numerical simulation of a jet penetrating thick-walled targets at various following velocities (the carrier’s initial velocity). For large stand-off distance (D), the influence on jet formation parameters was revealed under different following velocities (ranging from 0 to 1000 m/s), and the jet’s penetration performances were analyzed at various stand-off distances (ranging from 3D to 10D). Then, taking 3D as an example, the study investigated the influence mechanism of the coupling between following velocity and impact angle (ranging from −60° to 60°) on jet penetration performance. The results show that an increase in the following velocity causes the jet to bend and break at an earlier time. The following velocity has a minimal effect on jet tip velocity. Additionally, the lateral displacement is linearly correlated with stand-off distance. For normal penetration, the jet penetration depth decreases exponentially as the following velocity increases at the same stand-off distance. Especially, the penetration depth decreases by over 80% when the following velocity exceeds 600 m/s, and a further increase in the following velocity has a minimal effect on jet penetration depth. A greater jet penetration depth was achieved for the climbing-oblique penetration (COP) than the diving-oblique penetration (DOP) due to an increase in dynamic stand-off distance. Finally, the ratio of oblique to normal penetration depth for a jet with varying following velocities was derived based on the theory of steady-jet and hole expansion, and its accuracy was verified.