Dynamic Mechanical Properties and Constitutive Relation of TC8 Titanium Alloy
摘 要
对TC8钛合金进行了不同应变速率(0.000 1,0.001,0.01 s-1)下的室温准静态拉伸试验,并采用霍普金森压杆装置进行了不同应变速率与温度下的动态压缩试验,研究了该合金的准静态和动态力学性能;通过拟合试验数据获取参数建立J-C本构模型,并进行了试验验证。结果表明:随着准静态拉伸试验中应变速率的增大,TC8钛合金的屈服强度、抗拉强度与最大等效失效塑性应变均增大;随着室温动态压缩试验中应变速率的增大,合金的屈服强度与极限强度增大,表现出明显的应变速率强化效应,随着温度的升高,合金的屈服强度与极限强度降低,表现出明显的温度软化效应;由J-C本构模型计算得到的真应力-真应变曲线与试验结果相吻合,其平均相对误差为4.82%,说明该本构模型可以很好地预测TC8钛合金的高温动态力学性能。
Abstract
TC8 titanium alloy was subjected to room temperature quasi-static tensile tests at different strain rates (0.000 1, 0.001, 0.01 s-1) and dynamic compression tests at different strain rates and temperatures on the Hopkinson pressure bar device. The quasi-static and dynamic mechanical properties of the alloy were studied. The test data was fitted to obtain the parameters and then J-C constitutive model was established. The constitutive model was verified by tests. The results show that the yield strength, tensile strength and maximum equivalent failure plastic strain of TC8 titanium alloy all increased with increasing strain rate in the quasi-static tensile tests. The yield strength and ultimate strength of the alloy increased with increasing strain rate in the room temperature dynamic compression test, exhibiting an obvious strain rate strengthening effect; the yield strength and ultimate strength decreased with increasing temperature, exhibiting a significant temperature softening effect. The true stress-true strain curve calculated by the fitted J-C constitutive equation was consistent with the test results, and the average relative error was 4.82%, indicating that the constitutive model could predict the dynamic mechanical properties of TC8 titanium alloy at high temperature.
中图分类号 V252 DOI 10.11973/jxgccl202012015
所属栏目 物理模拟与数值模拟
基金项目 国家自然科学基金资助项目(51605218)
收稿日期 2019/10/1
修改稿日期 2020/8/7
网络出版日期
作者单位点击查看
备注蔡明(1993-),男,河北张家口人,硕士研究生
引用该论文: CAI Ming,CHEN Wei,CHEN Liqiang,ZHAO Zhenhua,LIU Lulu. Dynamic Mechanical Properties and Constitutive Relation of TC8 Titanium Alloy[J]. Materials for mechancial engineering, 2020, 44(12): 80~84
蔡明,陈伟,陈利强,赵振华,刘璐璐. TC8钛合金的动态力学性能及本构关系[J]. 机械工程材料, 2020, 44(12): 80~84
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【4】姚亚平. 高速旋转盘冲击拉伸试验机的研制及复合材料冲击拉伸性能的研究[D].合肥:中国科学技术大学,1989.
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【11】杨义,徐锋,李长富,等.BT8钛合金等轴α相参数与成分的关系[J].稀有金属材料与工程,2005,34(增刊3):23-26.
【12】TENG X,WIERZBICKI T.Evaluation of six fracture models in high velocity perforation[J].Engineering Fracture Mechanics,2006,73(12):1653-1678.
【13】WIERZBICKI T,BAO Y B,LEE Y W,et al.Calibration and evaluation of seven fracture models[J].International Journal of Mechanical Sciences, 2005,47(4/5):719-743.
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