Numerical Simulation Of Deformation Process Of Tungsten Wire Reinforced Copper-Zn Composites

Tungsten wire reinforced copper-zinc composite material has excellent mechanical properties and remarkable self-sharpening properties,and has the potential to become the core material of armor-piercing projectiles.At present,the self-sharpening characteristics of tungsten wire reinforced copper-zinc composite materials can be analyzed by collecting the residual projectile structure after the penetration,but the research on the self-sharpening mechanism of the material is not deep enough,so it is necessary to further study the deformation behavior of materials in the process of penetration.According to the above problems,this paper uses ANSYS / LS-DYNA finite element analysis software to scientifically study the deformation behavior of tungsten wire reinforced copper-zinc composites in the whole process of penetration.The deformation behavior of tungsten wire reinforced copperzinc composites during the penetration process is studied by numerical simulation,compared with the traditional core material tungsten-nickel-iron alloy,the self-sharpening mechanism of tungsten wire reinforced copper-zinc composites is analyzed,The effects of projectile initial velocity,target plate raw materials and target plate layers to the penetration performance and deformation mode of the material is studied,which lays a theoretical foundation for the design scheme and development of tungsten wire reinforced composites.In this paper,the mechanical properties of tungsten wire reinforced copper-zinc composites can be reflected by using the Johnson-Cook model and the Gruneisen equation of state,and the finite element simulation based on this can truly reflect the deformation process when the tungsten wire reinforced copper-zinc composite material penetrates the target plate.The results of finite element analysis show that tungsten wire reinforced copper-zinc composites has significant self-sharpening phenomenon,which is consistent with the experimental results.The stress distribution of the tungsten wire reinforced copper-zinc composite material during the penetration process is significantly different from that of the tungsten-nickel-iron alloy.The stress distribution is uneven,mainly concentrated on the axial tungsten wire,and the stress value reaches 2.5GPa.The stress received is less than 0.47 GPa.When the tungsten wire at the contact position with the target plate is bent,the stress on the tungsten wire after bending is reduced to about 1.2GPa.The self-sharpening mechanism of the penetration process of the tungsten wire reinforced copper-zinc composite material core is: the tungsten wire at the contact position with the target plate is bent,and the force direction of the tungsten wire after bending is at a certain angle to the axial direction.The high strength enables the material to maintain a certain mechanical properties as a whole.The bent tungsten wire is at 45° to the penetration direction,and the strength and plasticity are significantly reduced,resulting in shear damage,which causes the material to be damaged and fall off in the deformed area,showing the characteristics of self-sharpening.In this paper,numerical simulations of different projectile initial velocities,target layers and target materials of tungsten wire reinforced copper-zinc composites are carried out,and it is concluded that they have a significant effect on the penetration performance.With the increase of the initial velocity,the decrease of the number of layers of the target plate and the decrease of the strength of the target plate material,the self-sharpening property of the core material is more remarkable,and the penetration performance is better.