Scholarlink

<p>Ti60 alloy was shown to be a near-α titanium alloy designed for high-temperature applications, renowned for the outstanding thermomechanical properties, widely used in the aerospace field. However, Ti60 alloy was a difficult-to-machine material which could induce high cutting temperature and force in machining operations. This could result in severe wear of cutting tools and poor product quality. This study examined the dynamic mechanical response of Ti60 alloy through split Hopkinson pressure bar experiments, obtaining strain-rate-dependent dynamic stress-strain response curves. Thermal softening coefficients of Ti60 alloy were determined via the high-temperature hardness testing, while the temperature-dependent specific heat capacity of Ti60 alloy was derived from the laser thermal conductivity experiments. Furthermore, the thermophysical parameters and dynamic mechanical properties of Ti60 alloy are crucial for ensuring high precision in the numerical simulation’s outcomes during the cutting process. Thus, the flow stress data of Ti60 alloy obtained under non-isothermal conditions were corrected by the adiabatic temperature rise parameter. Subsequently, an isothermal stress-strain curve was obtained, improving the accuracy of the Johnson-Cook (J-C) and Power-Law (P-L) constitutive models of Ti60 alloy. After that, the validated P-L model was further verified through the numerical simulations and cutting experiments. Results demonstrated that the error between simulation and experimental cutting force was less than 20%, with the thrust force and feed force errors below 5%, and the tool wear error below 10%.</p>

错误：搜索内容不能为空，请输入英文关键词
错误：关键词超出字数限制，请精简
高级检索

Constitutive Modeling of Ti60 Alloy Based on Isothermal Stress-Strain Curves for Cutting Force and Tool Wear Prediction during Machining Process

  • 期刊论文

  • 发表日期：

    2026年5月23日

查看全文
  • Xiao Chen,
  • Xuming Zha,
  • Yunwu Guo,
  • Jiasheng Li,
  • Feng Jiang

摘要

Ti60 alloy was shown to be a near-α titanium alloy designed for high-temperature applications, renowned for the outstanding thermomechanical properties, widely used in the aerospace field. However, Ti60 alloy was a difficult-to-machine material which could induce high cutting temperature and force in machining operations. This could result in severe wear of cutting tools and poor product quality. This study examined the dynamic mechanical response of Ti60 alloy through split Hopkinson pressure bar experiments, obtaining strain-rate-dependent dynamic stress-strain response curves. Thermal softening coefficients of Ti60 alloy were determined via the high-temperature hardness testing, while the temperature-dependent specific heat capacity of Ti60 alloy was derived from the laser thermal conductivity experiments. Furthermore, the thermophysical parameters and dynamic mechanical properties of Ti60 alloy are crucial for ensuring high precision in the numerical simulation’s outcomes during the cutting process. Thus, the flow stress data of Ti60 alloy obtained under non-isothermal conditions were corrected by the adiabatic temperature rise parameter. Subsequently, an isothermal stress-strain curve was obtained, improving the accuracy of the Johnson-Cook (J-C) and Power-Law (P-L) constitutive models of Ti60 alloy. After that, the validated P-L model was further verified through the numerical simulations and cutting experiments. Results demonstrated that the error between simulation and experimental cutting force was less than 20%, with the thrust force and feed force errors below 5%, and the tool wear error below 10%.