Research On The Penetration Performance Of Ni/Al Reactive Liner Shaped Charge Jet

Ni/Al reactive material is a new multifunctional metallic composites with structural strength,high energy density and low sensitivity.When the shaped charged jet formed by the Ni/Al reactive material liner hits the target,it not only has the kinetic energy penetration effect of the traditional liner shaped charge jet,but also has the impact-induced chemical reaction characteristics,which can greatly enhance the comprehensive damage effect of the shaped charge warhead.Therefore,the reactive material damage element and its shaped charge technology have become one of the current research hotspots in the field of efficient damage.By changing the material formula,the penetration ability of the shaped charge liner can be effectively increased.So,based on the correlation mechanism between the impact response of the Ni/Al reactive shaped charge jet and the macroscopic crater characteristics and microstructure evolution of the steel target,this paper studies penetration performance on steel target of different Ni/Al ratios reactive material liner shaped charge jet from theoretical and experimental aspects.The main research contents and results are as follows:Powder liners with Ni/Al molar ratios of 2:1,1:1,1:2 and 1:4 were prepared by compression molding method.The penetration experiment was carried out with 45# steel as the target plate.Combining with the penetration theory model of shaped charge jet,the damage characteristics and penetration laws of the 45# steel target penetrated by different Ni/Al ratio reactive liner shaped charge jets are analyzed.The results show that Ni/Al=2:1 reactive liner sharped charge jet has the best penetration effect.Compared with the copper shaped charge jet,the penetration depth of the Ni/Al=2:1 shaped charge jet is reduced by 25%,but its average entrance crater diameter is increased by 37.2%,and its pore volume is increased by 16.1%.Subsequently,optical microscope(OM)and scanning electron microscope(SEM)was used to observe the microstructure of steel target.The microscopic observation results indicate that the area around the crater wall of the steel target has undergone serious plastic deformation,and there are zones: residual jet zone,“white” zone(a mixture of austenite and martensite)and deformation zone.There are obvious differences in the deformation amount and deformation degree of each area,the deformation amount and deformation degree of the “white” zone at the tail of the crater wall are larger than those of the head.The elemental composition and content of residual jet and “white” zone were analyzed by energy dispersive spectrometer.The results show that,compared with the copper shaped charge jet,the interaction between the Ni/Al shaped charge jet and the crater wall of steel target is stronger,and Ni/Al =1:4? Ni/Al =1:2>Ni/Al =1:1> Ni/Al =2:1,consistent with the roughness of the crater wall.The hardness of each area was measured with a Vickers microhardness tester.The microhardness results show that the hardness value of the “white” zone was the highest,and the hardness value of the “white”zone in the tail is higher than that in the head.