Research On Large Power EFP Based On Linear Charge

Aiming at linear shaped charge with constant curvature in length direction, formation of high power EFP and its influencing factors has been studied under the charge of detonated at two ends based on detonation wave collision theory. The overpressure whose peak is up to 2 times as non-collision pressure is found, when two detonation waves collide. When the linear shaped charge with constant curvature in length direction is detonated at two ends, according to detonation wave collision theory, two detonation wave collides in the middle area, high collision pressure is produced, high speed salient by the high collision pressure is formed in the middle part of the liner. Then the greater velocity gradient between the liners middle part and two ends part is generated, and because of the constant curvature in length direction, the two ends of liner gradually converges toward the middle in its continued flying, the liner formes to high power EFP with high speed, good shape and high liner efficiency. This high power EFP penetrates armor perfectly, and could be used as a single warhead, but also as MEFP’s sub-unit. So it has broad application prospects.Detonation wave collision mechanism and high power EFP formation mechanism has been studied in this paper, and numerical simulation has been used to analyze the formation process of high power EFP, finally the experiment is done to verify its power. The main content includes:(1)Formation mechanism of high power EFP has been researched under the charge of detonated, and two detonation wave collision mechanism in different ways has been theoretically analyzed, even high power EFP’s formation mechanism has been theoretically studied.(2)The formation of high power EFP has been researched by numerical simulation. According to the result of numerical simulation, we obtain liner’s efficiency and velocity of the head of EFP.(3)The factors influenced the formation process of high power EFP has been researched. According to numerical simulation, we obtain a few key factors, such as charge length, radius of curvature in length direction, the central angle in width direction, liner thickness and charge height. All the above can provide the basis for the optimization of charge.(4)Penetration power of high power EFP has been studied. According to the numerical simulation result, a relative excellent charge structure is selected and experimented, and obtain its penetration power.