摘要
利用Instron液压实验机和分离式Hopkinson压杆动态加载实验，在温度为298～773K、应变率为0．001～15550／s范围内得到TC16钛合金的准静态拉伸及动态压缩条件下的真应力-真应变曲线，并基于Johnson-Cook模型对其进行拟合分析。提出拟合Johnson-Cook方程的简便方法：即引入材料应力-应变曲线发展趋势项，避免对材料绝热温升的估算。结果表明：真应力随应变速率的增加而增加，随温度的增加而降低；当应变速率为10^5／s及温度高于673K时，材料此时的真应力低于准静态下的真应力；获得TC16动态本构关系，能较好地预测TC16钛合金的流变应力。
The true stress-true strain curves of Ti-3%Al-5%Mo-4.5%V alloy with a wide range of strain rates were investigated under uniaxial quasi-static tension and uniaxial dynamic compression respectively with Instron 8032 test machine and the split Hopkinson bar. A new method incorporating the stress-strain curve of Ti-3%Al-5%Mo-4.5%V alloy was proposed for determining the parameters based on Johnson-Cook model easily and avoiding the estimation of adiabatic temperature rising. The Johnson-Cook dynamic constitutive relationship for Ti-3%Al-5%Mo-4.5%V alloy was obtained. The results show that the true stress increases with increasing strain rate, while decreases with increasing temperature. Under the condition of high strain rate of 10^5/s and temperature above 673 K, the true stress is even less than that under quasi-static condition. Good agreement is obtained between the model prediction and the experimental stress--strain curves for Ti-3%Al-5%Mo-4.5% V alloy under both quasi-static and dynamic loadings.
出处
《中国有色金属学报》
EI
CAS
CSCD
北大核心
2008年第3期505-510,共6页
The Chinese Journal of Nonferrous Metals
基金
国家自然科学基金资助项目(50471059
50671121)
