Numerical Simulation of the Interference of Double-layer Wedge-Charge ERA on Shaped Jet

Based on the existing double-layer flat-charge explosive reactive armor (ERA), we designed 4 different structures of double-layered wedge-charge ERA, and employed the LSDYNA-3D software to evaluate their ability of interfering with the jet.We analyzed the motion state of flying-plates, the velocity and deflection of the jet head, the slug fracture, the depth of penetration, and the jet distribution in the target to select the optimal solution.The comparison shows that Scheme 3 has the fastest jet velocity reduction rate with the smallest and evenly distributed penetration depth.It can be seen that Scheme 3 has the best protection performance, followed by Scheme 4, Scheme 1 and Scheme 2 in sequence.In Scheme 3 and Scheme 4, a composite flying-plate layer similar to the explosion welding principle has been observed.Through the simulation study of the double-layer wedge-charge ERA, it is found that the reasonable use of the wedge-shaped charge can make the jet cutting more uniformly and enhance the protective performance of tanks, which provides a theoretical basis for future research on the charge structure.