Dynamic mechanical property and plastic constitutive relation of TC4-DT Ti alloy under high strain rate

被引：0

作者：

Zhang, Chang-Qing ^{[1
]}

Xie, Lan-Sheng ^{[1
]}

Chen, Ming-He ^{[1
]}

Shang, Guo-Qiang ^{[2
]}

机构：

[1] College of Mechanical and Electrical Engineering, Nanjing University of Aeronautics and Astronautics, Nanjing,210016, China

[2] Beijing Institute of Aeronautical Materials, Beijing,100095, China

来源：

Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2015年 / 25卷 / 02期

关键词：

Mechanical testing - Shear bands - Stress-strain curves - Constitutive models - Strain hardening - Titanium alloys - Bridge decks - Shear flow - Plastic flow;

D O I：

暂无

中图分类号：

学科分类号：

摘要：

The dynamic compression experiments of TC4-DT Ti alloy were performed at a range of strain rate from 1000 s-1 to 8000 s-1 by high split Hopkinson pressure bar for investigating its dynamic mechanical property and constitutive relation, and the true stress-strain curves under high strain rates were obtained. The results show that the true flow stress of TC4-DT is sensitive to the strain rates and TC4-DT has strain rate strengthening, plasticity-increasing and strain work-hardening. The observation of cross-section microstructure of deformed sample reveals that the adiabatic shear band is responsible for the rapid reduction of flow stress when TC4-DT was deformed at high strain rate. Based on the Johnson-Cook constitutive model, with new temperature item, the dynamic constitutive model of TC4-DT was obtained by fitting the experimental results. The comparison between the calculated curves and experimental results shows that the present dynamic constitutive model can make a better prediction of the plastic flow stress. ©, 2015, Central South University of Technology. All right reserved.

引用

页码：323 / 329