李云飞,曾祥国.动态拉伸过程TC11钛合金绝热温升的功热转化系数确定方法[J].稀有金属材料与工程,2018,47(7):2056~2060.[Yunfei Li,Xiangguo Zeng.Determination of conversion factor in adiabatic temperature rise of dynamic tensile behavior of TC11 alloy[J].Rare Metal Materials and Engineering,2018,47(7):2056~2060.]
动态拉伸过程TC11钛合金绝热温升的功热转化系数确定方法
投稿时间:2016-07-23  修订日期:2016-10-12
中文关键词:  两相钛合金  动态拉伸复元试验  绝热温升转化系数  修正Johnson-Cook模型
基金项目: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)
中文摘要:
      本文通过对分离式Hopkinson 拉杆试验装置进行改进,在入射杆与透射杆上加入余波吸收器,消除了动态拉伸过程中反射余波对试件的二次加载,从而发展了动态拉伸复元试验技术。对TC11两相钛合金试件进行动态拉伸复元试验,获得了TC11材料在不同应变率下的等温应力-应变曲线,成功实现了材料的温度软化效应与应变强化、应变率硬化效应的解耦。并且对TC11钛合金开展了不同初始温度下的准静态拉伸试验,采用Johnson-Cook模型描述材料的温度软化效应,并引入绝热动态拉伸过程的绝热温升值对Johnson-Cook模型进行修正,当修正模型计算所得的绝热曲线与试验所得绝热曲线相互吻合时,可以确定TC11钛合金材料在不同应变率动态拉伸条件下塑性耗散功向热量的转化系数,并且发现了应变率500s-1下的转化系数要小于应变率190s-1下的转化系数。
Determination of conversion factor in adiabatic temperature rise of dynamic tensile behavior of TC11 alloy
英文关键词:dual-phase titanium alloy  dynamic tension recovery experiments  conversion factor in adiabatic temperature rise  modified Johnson-Cook model
英文摘要:
      In this paper a split Hopkinson tension bar system is improved by adding wave absorbers into the incident bar and the transmission bar, and the reflected waves in the input and output bar in dynamic tension experiments will be eliminated. The dynamic tension recovery technique is developed by adopting the improved bar system. Dynamic tension and recovery experiments are conducted to obtain the adiabatic and isothermal stress-strain responses of the TC11 alloy at high strain rates. And the adiabatic softening effect is experimentally uncoupled from the strain-rate strengthening and strain hardening effects. The quasi-static tensile tests under different initial temperatures are also carried out to study the thermal softening effect which is described by using Johnson-Cook model. The model is modified by introducing the value of adiabatic temperature rise in dynamic tensile process.When the adiabatic curves of modified model and experiment are in good agreement, the conversion factors of plastic dissipation power to heat at different strain rates will be determined. And the conversion factor of the strain rate 500s-1 is found to be less than that of the strain rate 190s-1.
作者单位E-mail
李云飞 中国工程物理研究院总体工程研究所 401liyf@caep.cn 
曾祥国 四川大学建筑与环境学院  
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