EFP Formation Under Conditions Of Detonation Wave Collision

Traditional explosively formed projectile, which has kinetic energy, good air resistanceand aftereffect, strong penetration capability and no strict requirement on blasting height, hasbeen widely used. To further increase the quality the speed and the length to diameter ratio ofEFP is difficult, which due to the liner thickness and material was affected by axial symmetrycharge. To further enhance the penetration power of EFP, this paper based on detonation wavecollision and linear charge structure, and study the performance parameters of EFP, whichformed from a linear-segment liner under the action of two detonation wave collision. Thestyle of initiation contains two points, two lines and two plans were used. The oppositedirection detonation wave collided in the symmetry plane, produced higher pressure acting onthe center of the liner and formed the velocity gradient in the liner. Then the liner will close tothe middle to form high velocity Explosively Formed Projectile(EFP). This research canprovide guidance for the design of new efficient damage warhead.In this paper, using numerical simulation analysis explosive pressure changes before andafter collision, as well as pressure on the shaped charge liner before and after the collision,forming a linear velocity gradient in the direction of liner, liner form stable EFP and EFPstable speed and other factors.The main contents include:(1) The detonation waves collision pressure changes under various charge size wasstudied. Using numerical simulation calculated the different charge pressure before and aftercollision and compared with the theoretical value.When length of the charge is80~120mm,the charge height is25~35mm，the size of the charge is highly cost-effective.(2) The influence of different initiation modes on the formation of EFP in detonationwave is studied.By using two-point, two lines and two sides of initiation.Pressure of initiatingexplosive and EFP forming effect determination and comparison, the two edges of detonationvelocity of EFP forming under maximum and forming effect is good. (3) The effect of molding and EFP velocity of the three kinds of liner thickness modelswere studied.The model of equal thickness liner and two kinds of variable thickness linertype-one kind of liner along the curvature variable wall thickness, and one is liner thicknessalong the liner direction.In the given research plan, the best thickness is1.6~2.0mm in equalliner and the first variable thickness line.Linear variable thickness model in the liner thicknessT2between1.6~1.8mm molding effect is good.(4) Comparative study of the aspects of this property and penetrator EFP and LEFPdetonation wave propagation in shape, speed changes,and distribution, and on theirapplication engineering analyzes.