Research On Penetration Mechanism Of Explosively Formed Projectile With Double-layered Energetic Liners

In recent years,energetic material liner and its charging technology have received more and more attention from researchers at home and abroad,and have become one of the hot research issues in the field of efficient damage.Compared with the typical metal liner explosively formed projectile,the difference lies in,the energetic liner forms the energetic penetrator driven by the explosive impact.Through the combined action of the two damage mechanisms of kinetic energy penetration and implosion chemical energy release,the aftereffect damage power of the explosively formed penetrator is greatly increased,and the goal of efficient damage to the target is achieved.However,the penetration ability of the energetic penetrator is severely limited by the density and the speed of sound of the energetic material.In this paper,based on the basic theory of EFP molding and penetration,combined with the F shaped charge structure,a double-layer shaped charge structure with cushioning pad was designed.By using the tail fin of the explosive shaped projectile,the energetic penetrator was covered,which can not only make the energetic penetrator not fly away with the detonation products when it is formed under the action of explosion load,but also preserve the integrity of the energetic penetrator to a certain extent.It can also improve the penetration ability of the energy penetrating body.The energetic composite penetrator was obtained with reliable forming,good penetration performance and wide damage range after effect.By means of theoretical analysis,numerical simulation and experimental verification,the molding process and damage effect of penetrating steel target were studied,and the influence rules of wall thickness ratio,inner and outer space,length to diameter ratio of charging and shell thickness on the molding and damage effect of penetrating steel target were obtained.The research results showed that when the wall thickness ratio of the double-layer energetic liners was 2:4,the distance between the inner and outer liner was 1mm,the charge length was 100 mm,and the shell thickness was2 mm,the energetic composite penetrator obtained by the numerical simulation had the best molding effect and the maximum penetration depth,which was about 21.6% higher than that of the energetic penetrator.Through the verification experiment of double-layer energetic liners shaped charge of different wall thickness ratios penetrated the steel target,it was concluded that as the wall thickness of the energetic liner increased,the penetration depth first increased and then decreased,when the wall thickness ratio of the double-layer energetic liners was 2:4,the penetration depth of the energetic compound penetrator was the largest,which was about 27.6%higher than that of the single-layer energetic liner.Numerical simulation and experimental results were basically in agreement,and the research results could provide references for the design and research of energetic liner EFP shapes charges.