Experiment and constitutive model of rate-dependent behavior of titanium alloy TC11

被引：0

作者：

Zhang J. ^{[1
]}

Wang Y. ^{[2
]}

机构：

[1] Institute of Systems Engineering, China Academy of Engineering Physics, Mianyang

[2] CAS Key Laboratory of Mechanical Behavior and Design of Materials, Department of Modern Mechanics, University of Science and Technology of China, Hefei

来源：

Zhongguo Youse Jinshu Xuebao/Chinese Journal of Nonferrous Metals | 2017年 / 27卷 / 07期

关键词：

Constitutive model; Strain rate; Titanium alloy;

D O I：

10.19476/j.ysxb.1004.0609.2017.07.07

中图分类号：

学科分类号：

摘要：

The MTS809 machine, moderate strain-rate testing setup and the split hopkinson bar system were adopted to conduct uni-axial tension tests of TC11 at strain rates ranging from 1×10-3 s-1 to 1×103 s-1. The observation of microstructure and the fracture morphology was carried out via the optical microscope and SEM. A modified Johnson-Cook model was proposed to predict the mechanical behavior. Experimental results indicate that there is a positive strain-rate sensitivity with respect to the initial yield behavior. However, the transition of rate dependent sensitivity is presented at the moderate-rate loading conditions. The α grains and α+β colonies are stretched along the tension direction and break in a manner of ductile fracture. The modified Johnson-Cook constitutive model incorporates the different strain rate effects on the yield stress and strain hardening behavior. Excellent agreement between the experimental data and model predication indicates that such model is suitable for the rate-dependent numerical simulation of titanium alloy TC11. © 2017, Science Press. All right reserved.

引用

页码：1369 / 1375

页数：6

共 19 条

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