Study On The Formation Mechanism Of Jet From Shaped Charge With Cylinder-cone Liner

With the improvement of armor target protection performance,new challenges are put forward for shaped warhead technology.In order to achieve effective damage to the armored target,this paper carried out a study on the forming mechanism of the shaped charge jet of the cylinder-cone liner.Through the combination of theoretical analysis,numerical simulation and experimental verification,the verification test of the structural principle of the shaped charge of the cylinder-cone liner,the shaped jet forming process of the cylinder-cone liner,the shaped jet forming mechanism of the cylinder-cone liner,and the shaped jet penetration performance of the cylinder-cone liner were carried out.The research results can provide theoretical support for the engineering application of the new principle shaped charge warhead technology.The main research work is as follows:(1)The verification test of the structure principle of the shaped charge of the cylinder-cone liner is carried out,and the velocity of the jet head is measured,and the penetration effect of the steel target is obtained.Based on this,a model of shaped charge with cylinder-cone liner penetrating steel target with the same charge size is established.The action process of jet on steel target under the same conditions is studied by numerical simulation,and the results are compared with the experimental results.The results show that the numerical simulation results are in good agreement with the experimental results,and the numerical simulation method is reliable.At the same time,the penetration power of the shaped charge with cylinder-cone liner is obviously better than that of the shaped charge with single cone liner under the same conditions,especially in the perforation diameter.When the standoff distance is 400 mm,the penetration depth is increased by 19.3 %,and the perforation diameter is increased by 150 %,which verifies the significance of the research on the shaped charge of the cylinder-cone liner.(2)The forming process of shaped charge jet of cylinder-cone liner is studied.Through theoretical analysis and numerical simulation,the process of jet formation of cylindrical liner and single cone liner is analyzed respectively.The analysis model of jet formation of cylinder-cone liner is established,and the influence of structural parameters and materials of cylindrical liner on jet formation is obtained.The results show that the structural parameters and materials of the cylindrical part of the cylindrical cone shaped charge liner not only determine whether the cylindrical cover forms a jet head or is completely converted into a pestle,but also determine the jet velocity and effective length.When the length-diameter ratio of the cylindrical cover is 1 : 1,with the increase of the diameter and length of the cylindrical liner,the velocity of the jet head and the effective length increase first and then remain basically unchanged,and the jet velocity formed by the conical part also increases.When the length-diameter ratio of the cylindrical liner increases,the mass of the jet head formed by the cylindrical liner gradually decreases,and the velocity of the jet head increases first and then decreases.When the wall thickness of the cylindrical liner increases,the length of the jet does not change much,but the head fracture gradually becomes obvious.When the cylindrical liner material is nickel,steel and copper,a part of the cylindrical liner forms a jet head and a part forms a slug.When the materials are tungsten and tantalum,the cylindrical liner all forms a pestle.(3)Aiming at the propagation process of detonation wave in the shaped charge of cylinder-cone liner,the variation law of detonation pressure and detonation wave waveform is obtained,the forming mechanism of shaped charge jet of cylinder-cone liner is revealed,and the reason for the formation of high-speed jet of cylinder-cone liner is explained.The results show that the high-speed jet formed by the cylinder-cone liner is mainly manifested in the formation of a higher-speed jet head by the secondary collision of the cylindrical part;when the detonation wave bypasses the cylindrical part and acts on the cone liner,the angle between the wave front and the cone liner decreases,resulting in an increase in the pressure acting on the surface of the cone liner,and the cone liner also forms a jet with higher velocity.(4)The jet penetration performance of cylinder-cone liner is studied.According to the theoretical analysis,the main factors affecting the penetration performance of the shaped charge with cylinder-cone liner are determined.The influence of various factors on the penetration performance of the shaped charge is studied by numerical simulation method.The influence degree of each factor on the penetration performance of the shaped charge is obtained by orthogonal optimization method.The static penetration test of the shaped charge under the best structure is carried out.The results show that the penetration depth of the optimized cylindrical-cone shaped charge is 740 mm,and the hole diameter is 30 mm.Through the theoretical analysis,numerical simulation and experimental study of the shaped charge technology of the shaped charge with cylindrical-cone liner,the goal of greatly improving the comprehensive damage power of the new shaped charge warhead relative to the traditional shaped charge is realized,which is of great significance to improve the combat effectiveness.