利用有限元程序对TC4(Ti-6Al-4V)热氧化钛合金内空半球壳体进行子弹冲击模拟,基于准静态压缩实验和动态Hopkinson压杆实验数据,研究了径厚比、冲击速度、应变率效应对TC4热氧化钛合金内空半球壳体动态响应的影响,得到了不同工况下的TC4热氧化钛合金内空半球壳体的接触力峰值以及顶点位移.TC4热氧化钛合金的材料模型由实验数据拟合得到的考虑应变率效应和温度效应的Johnson-Cook本构方程描述,其中,实验数据由Hopkinson压杆技术测得.结果表明:接触力峰值和顶点位移均与径厚比成反比;接触力峰值和顶点位移均与冲击速度成正比;考虑应变率效应更能反映TC4热氧化钛合金内空半球壳体的抗冲击能力和抗变形能力.
The finite element program is used to simulate the bullet impact of TC4(Ti-6Al-4V)hot titanium oxide alloy inner hollow hemisphere shell. Based on quasi-static compression test and dynamic Hopkinson pressure bar test data, the effect of diameter-thickness ratio, impact velocity and strain rate on TC4 is studied. The contact force peak and the vertex displacement of the inner hollow hemisphere shell of TC4 hot titanium oxide alloy under different working conditions were obtained. The material model of the TC4 hot titanium oxide alloy is described by the Johnson-Cook constitutive relationship considering the strain rate effect and the temperature effect, where in the test data is measured by Hopkinson pressure bar technology. The results show that the contact force peak and the vertex displacement are inversely proportional to the diameter-thickness ratio; the contact force peak and the vertex displacement are both proportional to the impact velocity; the strain rate effect enhances the impact resistance and the resistance of deformation of the TC4 hot titanium oxide alloy inner hollow hemisphere shell.
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