Numerical Simulation On Dual Mode Damage Element With Enhanced Lateral Efficiency

Target diversity is the development trend of modern high-tech warfare,and the singularity of the formation of damage elements in the traditional shaped charge warheads has greatly restricted its application range.In order to realize the diversification of the types of damage and the damage mechanism of the shaped charge warhead to meet various operational needs,the multi-mode warhead came into being.Different detonation methods are realized by devices such as fuzes,so that the same warhead forms different types of damage elements,thereby specifically targeting the target.The dual mode damage element with enhanced lateral efficiency can effectively damage the light and heavy armor targets.It has better reaming and aftereffect killing ability.In this paper,the numerical simulation method is used to study the forming and penetration performance of the dual mode damage element with enhanced lateral efficiency.The main contents and achievements of the research include:(1)By engraving the outer surface of the outer liner,adding the flake,and adopting the composite charge structure and regulating the detonation waveform through wave-shaper,a warhead structural scheme for forming a dual mode damage element with enhanced lateral efficiency is proposed: The center point of the bottom of the inner charge is detonated to form a PELE damage element,and the center point of the bottom of the outer charge is detonated to form an EFP damage element.A numerical simulation study was carried out on the dual mode damage element.It can form a damage element with good molding and penetration performance.(2)The finite element model of the composite charge structure was established.The numerical method was used to visually compare the propagation process of the detonation wave inside the single charge and composite charge structure.The two groups with different explosion speed difference were selected to compare the shape of the detonation wave and the formation of the damage element(3)The influence of the position and diameter of the wave-shaper on the formation of dual mode damage element with enhanced lateral efficiency was studied by numericalsimulation.The results show that the longer the wave-shaper is from liner,the larger the length,the aspect ratio and the head speed of the EFP damage element.The length and aspect ratio of the PELE damage element first increase and then remain unchanged,and the head speed gradually increases.As the diameter of the wave-shaper increases,the length,aspect ratio and head speed of the EFP damage element increase.The change in the diameter of the wave-shaper has little effect on the forming parameters of the PELE damage element.(4)The outer cover materials are respectively made of copper and 4340 steel,and the inner cover materials are respectively made of 2024 aluminum,nylon and Teflon.The forming of the dual mode damage element with enhanced lateral efficiency was studied by numerical simulation.The forming process and velocity cloud of the dual mode damage element under different combinations of inner and outer liner materials were obtained.The length,aspect ratio,head speed and velocity gradient of each damage element are calculated.(5)The inner and outer coatings are made of different material combinations.The penetrating performance of the dual mode damage element with enhanced lateral efficiency was studied by numerical simulation.The results show that when the outer liner material is4340 steel and the inner liner material is 2024 aluminum,the velocity gradient of the damage element reaches the target is the smallest.The damage element is formed relatively fast,and the target plate has the largest opening.