锻压技术

参考条件对MJC和MZA模型预测精度的影响

英文标题：Influence of reference condition on prediction precise for modified Johnson-Cook and modified Zerilli-Armstrong models

作者：马斌梁强李平

单位：重庆工商大学

关键词：HAl61-4-3-1合金流动应力 M-JC模型 M-ZA模型预测精度

分类号：TG146.1

出版年,卷(期):页码：2021,46(5):254-264

摘要：

以HAl61-4-3-1合金为研究对象，采用Gleeble-3500热模拟试验机在600~800 ℃的变形温度、0.01~10 s-1的应变速率下进行等温热压缩实验，获得该材料的真实应力-真实应变曲线，分析热压缩过程中摩擦和温升效应对流动应力的影响，修正了流动应力曲线。基于修正的真实应力-真实应变数据，在不同参考条件下，分别建立该合金的修正JohnsonCook（MJC）模型和修正ZerilliArmstrong（MZA）模型，并引入统计学方法对比分析了不同参考条件下两种模型的拟合精度。结果表明：参考条件对MJC模型预测精度的影响大于MZA模型，在各自的最优参考条件下，MJC模型的预测精度高于MZA模型，更适合作为后续有限元模拟的材料本构模型。

For HAl61-4-3-1 alloy, the isothermal thermal compression experiments at the deformation temperature of 600-800 ℃ and the strain rate of 0.01-10 s-1 were conducted by thermal simulator Gleeble-3500, and the true stress-true strain curves of this material were obtained. Then, the influences of friction and temperature rise on the flow stress during the hot compression process were analyzed, and the flaw stress curves were corrected. Furthermore, based on the modified true stress-true strain data, under different reference conditions, the modified Johnson-Cook (M-JC) model and the modified Zerilli-Armstrong (M-ZA) model were established respectively, and the fitting accuracies of two models under different reference conditions were compared and analyzed by introducing the statistical method. The results show that the influences of reference conditions on the prediction accuracy of M-JC model are greater than that of M-ZA model. Under their optimal reference conditions, the prediction accuracy of M-JC model is higher than that of M-ZA model, which is more suitable as a material constitutive model for finite element simulation in the next.

基金项目：

重庆市基础科学与前沿技术研究专项基金资助项目（cstc2017jcyjAX0175）；重庆市教育委员会科学技术研究项目(KJQN201900836)；重庆工商大学校内科研项目（1752009）

马斌（1971-），男，硕士，实验师 E-mail：mabin@ctbu.edu.cn

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