To improve the damage performance of the shaped charge when damaging the concrete target, a new structure of shaped charge with reactive material composite liner was proposed. The behavior of reactive material composite liner-shaped charge penetrating the concrete target was researched by numerical simulation in the finite element simulation platform Autodyn-2D. The effects of the ratio of liner diameter and the ratio of the liner thickness of the inner liner to the composite liner on the penetration depth, hole diameter, and the following behavior of reactive materials were obtained. Numerical simulations show that, with increasing the liner diameter ratio and the liner thickness ratio, the penetration depth and hole diameter of the composite jet into concrete first increase and then gradually decrease. However, the increase of the liner diameter ratio and thickness ratio also means a decrease in the reactive materials’ total mass, which will significantly affect the following reactive materials into the penetration hole. Simulated results further show that it is better to find out that the liner diameter ratio is 0.7 and the liner thickness ratio is 0.2~0.4. The penetration depth and hole diameter of the composite jet into the concrete match well with the quality of the following reactive materials.

To study the penetration and cratering effect of reactive material composite jets, a series of experiments are carried out for the shaped charge (SC) with different composite liners damaging steel targets. The inner layer of composite liners is metal and the outer one is a polytetrafluoroethylene/aluminum (PTFE/Al) reactive material. Copper (Cu), titanium (Ti) and Al inner liners are used in this paper. The reactive material liner is composed of 73.5 wt.% PTFE and 26.5 wt.% Al powder through mass-matched ratios. Reactive material composite liners are prepared through machining, cold pressing and a sintering process. The SC mainly consists of a case, a composite liner, high-energy explosive and an initiator. The steel target is steel 45#, with a thickness of 66 mm. A standoff of 1.0 CD (charge diameter) is selected to conduct the penetration experiments. The experimental results show that when the inner layer of the composite liner is composed of Ti and Al, the hole diameters on the steel target formed by the reactive material composite jet are significantly larger than that of the inner Cu liner. By introducing the initiation delay time (τ) and detonation-like reaction model of PTFE/Al reactive materials, an integrated numerical simulation algorithm of the penetration and detonation-like effects of reactive material composite jets is realized. Numerical simulations demonstrate that the initial penetration holes on the steel targets are enlarged under the detonation-like effects of PTFE/Al reactive materials, and the simulated perforation sizes are in good agreement with the experimental results.

The formation characteristics of reactive material (RM) composite jet were studied by finite element software AUTODYN. The effect of diameter and thickness ratio, and cone angle of the liner on the tip velocity of composite jet and effective jet length were investigated. In numerical simulations, with increasing of the ratio of liner diameter, the ratio of liner thickness and the liner cone angle, the tip velocity of the composite jet decrease. With increasing of the liner cone angle, the effective length of composite jet decreases. But it is almost independent of the liner diameter and thickness ratio. When the liner diameter ratio is 0.6-0.8, the liner thickness ratio is 0.1-0.2, and the cone angle of composite liner is 60°-80°, the comprehensive performance of the RM-composite jet is better.