Detonation waves will bypass a wave shaper and propagate in the form of a horn wave in shaped charge. Horn waves can reduce the incidence angle of a detonation wave on a liner surface and collide with each other at the charge axis to form overdriven detonation. Detection electronic components of small-caliber terminal sensitive projectile that are limited by space are often placed inside a wave shaper, which will cause the wave shaper to no longer be uniform and dense, and weaken the ability to adjust detonation waves. In this article, we design a double-layer shaped charge (DLSC) with a high-detonation-velocity explosive in the outer layer and low-detonation-velocity explosive in the inner layer. Numerical and experimental simulation are combined to compare and analyze the forming process and penetration performance of explosively formed projectile (EFP) in DLSC and ordinary shaped charge (OSC). The results show that, compared with OSC, DLSC can also adjust and optimize the shape of the detonation wave when the wave shaper performance is poor. DLSC can obtain long rod EFPs with a large length-diameter ratio, which greatly improves the penetration performance of EFP.

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The inside back cover picture shows that due to the difference in chemical and physical properties of the two explosives, the detonation wave propagating in the Low detonation velocity explosive (LE) near the contact surface will gradually deviating from the C‐J condition. The propagation law of Mach wave in Double‐layer shaped charge (DLSC) and Ordinary shaped charge (OSC) is analyzed and compared by combining theoretical analysis with numerical simulation. The results show that in OSC, Mach wave attenuates to steady spherical wave with the increasing of propagation distance. In DLSC, the Mach wave propagates with convergent horn wave, the axis of the DLSC remains in the Overdriven detonation (ODD) state. The intensity of Mach wave in DLSC is related to detonation velocity D and polytropic exponent k. More details are discussed in the Full Paper by Yakun Liu, Jianping Yin, and Zhijun Wang on page 1410 ff.