压剪载荷作用下TB6钛合金的动态力学性能

邹学韬; 张晓晴; 姚小虎

doi:10.11858/gywlxb.20190713

压剪载荷作用下TB6钛合金的动态力学性能

doi: 10.11858/gywlxb.20190713

华南理工大学土木与交通学院，广东广州　510641

基金项目: 国家自然科学基金（11672110, 11472110）

详细信息

作者简介:
邹学韬（1993－），男，硕士研究生，主要从事冲击动力学研究. E-mail: zouxt-scut@outlook.com

通讯作者:
姚小虎（1974－），男，博士，教授，主要从事爆炸与冲击动力学研究. E-mail: yaoxh@scut.edu.cn

中图分类号: O347.3
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出版历程
- 收稿日期: 2019-01-17
- 修回日期: 2019-01-28

Dynamic Behavior of TB6 Titanium Alloy under Shear-Compression Loading

School of Civil Engineering and Transportation, South China University of Technology, Guangzhou 510641, China

摘要

摘要: 钛合金以其轻质高强的优异力学性能被广泛应用于航空航天领域。使用Instron万能材料试验机和分离式霍普金森压杆，对TB6钛合金进行准静态和动态力学性能实验，得到了压缩、拉伸和压剪载荷作用下TB6钛合金的准静态和动态应力-应变曲线，构建了单轴压缩和纯剪切两种应力状态下的Johnson-Cook动态本构模型。结果表明，TB6钛合金的屈服应力表现出明显的拉压不对称性、应变率强化和热软化效应。使用拉压不对称因子，修正了von Mises屈服准则，修正的屈服准则可很好地预测TB6钛合金的准静态和动态屈服行为。
- TB6钛合金 /
- 压剪载荷 /
- 分离式霍普金森压杆 /
- 动态力学性能 /
- 本构模型
Abstract: Titanium alloy is widely used in aerospace industry due to its excellent mechanical properties of high strength and light weight. In this paper, a quasi-static and dynamic tests of TB6 titanium alloy has been implemented with an Instron universal material testing machine and a split Hopkinson pressure bar (SHPB). Quasi-static and dynamic stress-strain curves of TB6 titanium alloy under compression, tension and shear-compression loads were obtained. Based on the data of experiment, we have established Johnson-Cook dynamic constitutive model under uniaxial compression and pure shear. The results show that, the yield stress of TB6 titanium alloy exhibits obvious tension-compression asymmetry, strain rate hardening and thermal softening effects. The von Mises yield criterion is modified by considering the asymmetric factor of tension and compression. The modified yield criterion has been proved to be accurate and suitable for predicting the quasi-static and dynamic yield behaviors of TB6 titanium alloy.
- TB6 titanium alloy /
- shear-compression load /
- split Hopkinson pressure bar /
- dynamic mechanical properties /
- constitutive model

HTML全文

图 1 压剪试件和帽型试件的应力状态

Figure 1. Stress of shear-compression and cap-type specimens

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图 2 试件应变云图

Figure 2. Nephograms of strain distribution in specimens

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图 3 准静态正应力-应变曲线

Figure 3. Quasi-static normal stress-strain curve

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图 4 准静态切应力-应变曲线

Figure 4. Quasi-static shear stress-strain curve

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图 5 SHPB实验典型波形

Figure 5. Typical waves of SHPB experiments

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图 6 SHPB动态压缩应力-应变曲线

Figure 6. Stress-strain curves of TB6 titanium alloy under SHPB dynamic compression

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图 7 绝热温升曲线

Figure 7. Time history of temperature rise during adiabatic process

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图 8 不同应变率下J-C模型预测与实验结果的比较

Figure 8. Stress-strain cures at different strain rates from experiments and J-C model fitting

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图 9 不同应变率下的初始屈服面

Figure 9. Initial yield surface at different strain rates

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图 10 应变率3500 s^-1下的后继屈服面

Figure 10. Succeeding yield surface at strain rate of 3500 s^-1

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表 1 J-C模型参数拟合结果

Table 1. Fitting results of J-C model parameters

Condition A/MPa B/MPa n m

Uniaxial compression 939 326.6 0.24 0.661 18
Pure shear 495 92.5 0.21 0.655 48

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