Murugesan Mohanraj, Yu Jae-Hyeong, Chung Wanjin, Lee Chang-Whan
Department of Mechanical System Design Engineering, Seoul National University of Science and Technology, Seoul 01811, Republic of Korea.
Department of Mechanical Information Engineering, Seoul National University of Science and Technology, Seoul 01811, Republic of Korea.
Materials (Basel). 2023 Jul 19;16(14):5088. doi: 10.3390/ma16145088.
Constitutive equations were recognized for AZ31B magnesium alloy at higher temperatures and strain rates from conventional empirical models like the original Johnson-Cook (JC), modified JC, and modified Zerilli-Armstrong (ZA) models for capturing the material warm deformation behavior. Uniaxial warm tensile tests were performed at temperatures (50 to 250 °C) and strain rates (0.005 to 0.0167 s-1) to probe AZ31 magnesium alloy flow stress values. Depending on the calculated flow stress, constitutive equations were recognized, and these established models were assessed by the coefficient of determination (R2), relative mean square error (RMSE), and average absolute relative error (AARE) metrics. The results demonstrated that the flow stress calculated by the modified JC and ZA models revealed good agreement against the test data. Thus, the outcomes confirmed that the recognized modified JC and modified ZA models could effectively forecast AZ31 magnesium alloy flow behavior by capturing the material deformation behavior accurately.
通过传统的经验模型，如原始的约翰逊-库克（JC）模型、修正的JC模型和修正的泽里利-阿姆斯特朗（ZA）模型，在更高温度和应变速率下识别了AZ31B镁合金的本构方程，以捕捉材料的热变形行为。在温度（50至250°C）和应变速率（0.005至0.0167 s-1）下进行单轴热拉伸试验，以探测AZ31镁合金的流动应力值。根据计算出的流动应力，识别本构方程，并通过决定系数（R2）、相对均方误差（RMSE）和平均绝对相对误差（AARE）指标对这些已建立的模型进行评估。结果表明，修正的JC模型和ZA模型计算出的流动应力与试验数据显示出良好的一致性。因此，结果证实，识别出的修正JC模型和修正ZA模型可以通过准确捕捉材料变形行为来有效地预测AZ31镁合金的流动行为。
