Numerical Simulation Research On A MEFP Payload Concept Of Three Liners Paralleled

In recent local wars in the world, It is represented that helicopter and armored vehicles, which attack the targets from air and ground, play a very important role with the result of the war. In order to damage this type of armor more effectively,Multiple Explosively Formed Penetrator(MEFP)has been developed by many countries and successfully applied to a variety of weapons. By changing the shaped charge structure or liner structure, MEFP produces several independent penetrators by different detonation methods, which attack a area target of light weapons with high kill probability. Compared with the single EFP payload technology, MEFP provides great intensive attack and large areas of damage to the target by forming multiple spheriform or ellipsoidal Formed Penetrators, especially it has high efficiency for the armored targets of cluster ground and air.This paper begins by an introduction presenting the state of the art in formation of MEFP payload, followed by describing the formation mechanism of MEFP that proposed a structural concept of three liners paralleled together. Then the principal factors which influence the forming properties of MEFP are analyzed. Finally initiation methods and the number of initiation point are also analyzed.On this basis, MEFP shaped charge structure with three liners proposed in this paper is modeled by Pre-processing software—TRUEGRID. Then the model is simulated by ANSYS/LS-DYNA. Copper and steel liners are compared. The process and performance of MEFP initiated by one point, three points and multi-points(19 points with ring-shaped) is discussed. The results show that a high-speed projectiles is formed when MEFP shaped charge structure detonates. By comparing the simulation results, it shows that the performance of MEFP initiated by three points is the best proposal.Finally, the mechanism of detonation wave towards the formation of MEFP is analyzed. The numerical simulation with asymmetrical liners and asynchronous initiation under three point detonated are made. The result indicates that when a liner rotates a small angle along the circle which formed by three concentric liners, the penetration ability changes a little. In the cases of single-point and two points delayed detonation, the velocity and scattering angle of projectile which is delay detonated is better. Meanwhile, the scattering angle of the projectile is increase with the delayed time.Results can provide reference to engineering design of MEFP warhead.