Dynamic constitutive models of Ti-6Al-4V based on isothermal ture stress-strain curves

被引:17
作者
Yan, Lan [1 ]
Jiang, Anna [1 ]
Li, Yaning [2 ]
Qiu, Tian [3 ]
Jiang, Feng [3 ]
Xie, Hong [4 ]
Wang, Fuzeng [3 ]
Wu, Xian [1 ]
Zhang, Yong [1 ]
机构
[1] Huaqiao Univ, Coll Mech Engn & Automat, Xiamen 361021, Peoples R China
[2] Northwest Inst Nonferrous Met Res, State Key Lab Porous Met Mat, Xian 710016, Peoples R China
[3] Huaqiao Univ, Inst Mfg Engn, Xiamen 361021, Peoples R China
[4] Dong Fang Turbine CO LTD, Dept Engn, Deyang 618000, Peoples R China
来源
JOURNAL OF MATERIALS RESEARCH AND TECHNOLOGY-JMR&T | 2022年 / 19卷
基金
中国国家自然科学基金;
关键词
Dynamic mechanical properties; Temperature-dependent specific heat capacity; Adiabatic temperature rise; True stress-strain isothermal curves; Power-law model; Johnson-Cook model; SERRATED CHIP FORMATION; CUTTING PERFORMANCE; PVD COATINGS; WIDE-RANGE; ALLOY; TEMPERATURE; RATES; EQUATION; BEHAVIOR;
D O I
10.1016/j.jmrt.2022.06.164
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Ti-6Al-4V titanium alloy is a typical difficult-to-cut material used in many fields. The selection of cutting parameters exerts tremendous influences on the material removal process. Finite element numerical simulation is a low-cost method to obtain optimized cutting parameters. Finite element simulation requires the study of machining properties of machined materials. The material removal and related physical phenomena during machining are characterized by the dynamic mechanical properties of the machined material. In this paper, the dynamic mechanical properties of Ti-6Al-4V have been tested by the high temperature split Hopkinson pressure bar system to obtain true stress-strain curves under different conditions. The sensitivity of strain and temperature of Ti-6Al-4V has been analyzed. The influence of temperature-dependent specific heat capacity, which has been tested by a laser thermal conductivity tester, on adiabatic temperature rise has been considered. Adiabatic temperature rise has been calculated separately with constant specific heat capacity and temperature-dependent specific heat capacity. True stress-strain curves have been switched to true stress-strain isothermal curves to analyze separately the influence of strain rate and temperature on true stress. Based on true stress -strain isothermal curves, the constitutive models of power-law and Johnson-Cook have been introduced to fit the experimental results. The fitting results of the two constitutive models have been compared with the experiment results, which have an average error less than 6%. (C) 2022 The Author(s). Published by Elsevier B.V.
引用
收藏
页码:4733 / 4744
页数:12
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