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A Modified Johnson-Cook Model to Predict Stress-strain Curves of Boron Steel Sheets at Elevated and Cooling Temperatures

机译:改进的Johnson-Cook模型预测高温和低温下硼钢板的应力-应变曲线

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摘要

In order to predict correctly stress-strain curve for tensile tests at elevated and cooling temperatures, a modification of a Johnson-Cook (J-C) model and a new method to determine (J-C) material parameters are proposed. A MATLAB tool is used to determine material parameters by fitting a curve to follow Ludwick and Voce's hardening law at various elevated temperatures. Those hardening law parameters are then utilized to determine modified (J-C) model material parameters. The modified (J-C) model shows the better prediction compared to the conventional one. An FEM tensile test simulation based on the isotropic hardening model for metal sheet at elevated temperatures was carried out via a user-material subroutine, using an explicit finite element code. The simulation results at elevated temperatures were firstly presented and then compared with the measurements. The temperature decrease of all elements due to the air cooling process was then calculated when considering the modified (J-C) model and coded to VUMAT subroutine for tensile test simulation. The modified (J-C) model showed the good comparability between the simulation results and the corresponding experiments.
机译:为了正确预测在高温和冷却温度下进行拉伸试验的应力-应变曲线,提出了对Johnson-Cook(J-C)模型的修改和确定(J-C)材料参数的新方法的建议。使用MATLAB工具通过拟合曲线以在各种高温下遵循Ludwick和Voce的硬化定律来确定材料参数。然后,将那些硬化定律参数用于确定修改后的(J-C)模型材料参数。与常规模型相比,改进的(J-C)模型显示出更好的预测。通过用户材料子例程,使用明确的有限元代码,基于高温下的金属板各向同性硬化模型进行了FEM拉伸试验模拟。首先介绍了在高温下的仿真结果,然后将其与测量结果进行了比较。然后,当考虑修改后的(J-C)模型时,计算出由于空气冷却过程而导致的所有元件的温度下降,并将其编码到VUMAT子例程中以进行拉伸测试模拟。改进的(J-C)模型显示了仿真结果与相应实验之间的良好可比性。

著录项

  • 来源
    《High temperature materials and processes》 |2012年第1期|p.37-45|共9页
  • 作者单位

    Department of Mechanical Engineering, Jeju National University, Jeju-si, Jeju, Republic of Korea,School of Mechanical Engineering, Hanoi University of Science and Technology, Hai Ba Trung District, Hanoi City, Vietnam;

    School of Mechanical Engineering, Hanoi University of Science and Technology, Hai Ba Trung District, Hanoi City, Vietnam;

    Department of Mechanical Engineering, Jeju National University, Jeju 690-756, Republic of Korea;

    Department of Mechanical Engineering, Kyungpook National University, Buk-ku, Daegu, Republic of Korea;

    Department of Mechanical Engineering, Kyungpook National University, Buk-ku, Daegu, Republic of Korea;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Finite element method (FEM); boron steel; tensile test; cooling; hardening;

    机译:有限元法(FEM);硼钢;拉伸试验;冷却;硬化;

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