钨丝增强铜锌复合材料侵彻过程的数值模拟

Numerical simulation of penetration process of tungsten wire reinforced copper-zinc composites

摘要:

基于Johnson-Cook模型和Gruneisen状态方程建立有限元分析模型，使用LS-DYNA软件对钨丝增强铜锌复合材料和钨镍铁合金侵彻钢靶过程开展数值模拟研究，分析两种材料在侵彻过程中各个阶段的变形，探讨钨丝本身的各向异性对侵彻性能的影响。结果表明，钨丝增强铜锌复合材料表现出明显的自锐化现象，与实验结果相符。复合材料在侵彻过程中应力主要集中在轴向的钨丝上，应力值达到2.5GPa，铜锌合金受力不足0.47GPa。该弹芯材料侵彻时的变形方式为：与靶板接触的钨丝发生弯曲，弯曲后的钨丝受力方向与轴向呈一定角度，强度和塑性明显降低。在剪切应力作用下，使材料变形区域发生破坏脱落，形成了尖锐的头部，从而表现出自锐化特征。

关键词:钨丝增强铜锌复合材料;侵彻;数值模拟;各向异性

Abstract:

Based on the Johnson-Cook model and Gruneisen equation of state, a finite element analysis model was established, and the LS-DYNA software was used to carry out numerical simulation research on the penetration process of tungsten wire reinforced copper-zinc composite materials and tungsten-nickel-iron alloys into steel targets. The deformation of each stage in the tungsten wire is discussed, and the influence of the anisotropy of the tungsten wire on the penetration performance is discussed. The results show that the tungsten wire reinforced copper-zinc composite exhibits obvious self-sharpening phenomenon, which is consistent with the experimental results. During the penetration process, the stress is mainly concentrated on the axial tungsten wire, the stress value reaches 2.5GPa, and the stress of the brass is less than 0.47GPa. The deformation mode is as follows: tungsten wire bends after contracting the target plate. the forced direction of the tungsten wire has changed to a certain angle with the axial direction. The strength and plasticity of the composite are significantly reduced at this direction. With the destroy of deformation areas, a sharp head of the composite penetrator is formed, which shows the characteristics of self-sharpening.

Key words:tungsten wire reinforced copper-zinc composite; penetration; numerical simulation; anisotropy