基于Taylor杆的Ti-5553钛合金动态特性研究

发布时间：2018-04-11 04:22

  本文选题：固体力学 + Ti-合金　； 参考：《兵工学报》2015年09期

【摘要】：利用Taylor杆冲击实验与数值模拟方法研究了Ti-5553钛合金在高应变率冲击下的动态行为。Ti-5553合金在两种热处理工艺处理后获得了不同准静态力学性能的等轴组织和双态组织。在泰勒杆冲击实验的基础上,应用ANSYS/LS-DYNA有限元分析软件研究了材料参数屈服强度值σs和失效应变值εf的变化对Taylor杆冲击能量、速度、加速度等过程参量和冲击结果的影响,将σs值设定为1 170~1 400 MPa,εf设定为0.1~0.8.研究结果表明:屈服强度值的变化对冲击前后能量、速度、加速度的改变量影响较小。随着屈服强度值的增大,冲击过程中能量、速度、加速度的变化速率有所增加,冲击后试样的应变量减小;失效应变值的变化对冲击过程量有明显影响;对等轴组织钛合金,εf0.7时,随着失效应变值的增大,能量、速度、加速度的变化速率逐渐增大,试样冲击后几乎无回弹现象;当εf≥0.7时,过程参量曲线全部重合,试样冲击后有明显回弹现象;当设定εf=0.75和εf=0.35时,等轴组织和双态组织钛合金分别符合真实Taylor杆冲击变形特征。
[Abstract]:The dynamic behavior of Ti-5553 titanium alloy under high strain rate impact was studied by means of Taylor rod impact test and numerical simulation. After two heat treatment processes, the equiaxed structure and double state microstructure of Ti-5553 titanium alloy with different quasi-static mechanical properties were obtained.On the basis of Taylor bar impact test, the effect of material parameter yield strength 蟽 s and failure strain value 蔚 f on the impact energy, velocity and acceleration of Taylor rod was studied by using ANSYS/LS-DYNA finite element analysis software.The 蟽 s value is set to 1 170 ~ 1 400 MPA, and 蔚 f is 0. 1 ~ 0. 8.The results show that the change of yield strength has little effect on the change of energy, velocity and acceleration before and after impact.With the increase of yield strength, the change rate of energy, velocity and acceleration in the impact process increases, and the strain of the specimen decreases after impact, and the change of failure strain value has a significant effect on the impact process.With the increase of failure strain value, the change rate of energy, velocity and acceleration in iso-axial titanium alloy, 蔚 f 0.7, increases gradually, and there is almost no rebound phenomenon after impact, and when 蔚 f 鈮，

本文编号：1734415