Formation Mechanism of Linear Explosive Formed Penetrator by Midpoint Initiating Manner

Abstract

Linear explosively formed penetrator (LEFP) is an optimal combination of linear cutting sword and conical shaped charge but is completely different with those two above. Initiating manner of LEFP is one of the most important factors that can affect its performance obviously. LEFP forming mechanisms of linear shaped charge initiated from the mid-point were studied with combined method of theoretical analysis, experiments and numerical simulation. Liner movement driven by the detonation wave action was analyzed as a three-dimensional issue and a synthetical model of liner movement was established. The model were verified by the penetrating experiments with the LEFP initiated from midpoint under stand-off which is 5 times distance of the LEFP caliber size. Formation processes of LEFP were described through numerical simulation and the simulation results were in concordance with those of experiments.

Deformation and Fracture Failure of a High-Speed Long Rod Intercepted by Linear Explosively Formed Penetrators Sequence

“…In the literature [ 17 , 18 , 19 , 20 , 21 ], the effects of different structural parameters and material properties of LSC on its penetration properties were studied. After designing the LSC with an arc-shaped liner, Ruijun Gou et al established a theoretical model of the LEFP detonation at different initiation positions and discussed the factors affecting its penetration depth [ 21 , 22 ]. The process of LEFP truncating the long rod can be regarded as the thermomechanical loading process, and the occurrence and propagation of cracks lead to the failure of the long rod.…”

Numerical Simulation of Linear Explosive Formed Penetrator by Endpoint Initiating Manner

“…Yet the jet blade has defects on stand-off and aftereffect because of the charge structure limitation. In order to improve the performance of the linear shaped charge, the structure of charge was changed by replacing the V-shaped liner with a round one to get linear explosively formed penetrator (LEFP) [3] (Figure 1). Compared with jet blade，LEFP has greater range of stand-off and better after-effect which makes it can cut a target from a long distance and has higher efficiency.…”