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李云飞,曾祥国.TC21钛合金动态拉伸行为的率-热效应及其本构关系研究[J].稀有金属材料与工程(英文),2018,47(6):1760~1765.[Li Yunfei and Zeng Xiangguo.Effect of strain rate and temperature on the dynamic tensile behavior and constitutive model of TC21 titanium alloy[J].Rare Metal Materials and Engineering,2018,47(6):1760~1765.]
Effect of strain rate and temperature on the dynamic tensile behavior and constitutive model of TC21 titanium alloy
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Received:August 12, 2016  Revised:March 10, 2017
DOI:
Key words: Dual-phase titanium alloy  Dynamic tensile behavior  Rate-temperature sensitivity  constitutive model
Foundation item:国家自然科学基金委员会与中国工程物理研究院联合基金(项目号U1430119)
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Li Yunfei and Zeng Xiangguo  
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Abstract:
      The dynamic tensile behavior of a newly developed Ti-6Al-2Sn-2Zr-3Mo-1Cr-2Nb-Si alloy (referred as TC21) over a wide range of strain rates from quasi-static to dynamic regimes (0.001-1250s-1) at different temperatures are experimentally investigated. A split Hopkinson tension bar apparatus and a static material testing system are utilized to obtain the stress-strain response under uniaxial tension loading condition. The experimental results indicate that the tensile behavior of TC21 titanium alloy is dependent on the strain rate and temperature. The initial yield stress increases with increasing strain rate. The effects of strain rate and temperature on the initial yield behavior are studied by introducing two rate sensitivity parameters. The phenomenologically based constitutive model (Johnson-Cook model) is suitably modified to describe the dynamic tensile behavior of TC21 titanium alloy. The predicted results of modified model are in good agreement with the experimental data subjected to the investigated range of strain rates and temperatures.