基于平面应变压缩的AZ80镁合金本构模型研究  

Study on constitutive model of AZ80 magnesium alloy based on plane strain compression

作　　者：张钊玮 曾健[1] 王锋华 靳丽[1] 董杰[1] ZHANG Zhao-wei;ZENG Jian;WANG Feng-hua;JIN Li;DONG Jie(National Engineering Research Center of Light Alloy Net Forming,School of Materials Science and Engineering,Shanghai Jiao Tong University,Shanghai 200240,China)

机构地区：[1]上海交通大学材料科学与工程学院轻合金精密成型国家工程研究中心,上海200240

出　　处：《塑性工程学报》2020年第10期139-146,共8页Journal of Plasticity Engineering

基　　金：国家自然科学基金资助项目(52071211);国家重点研发计划项目(2016YFB0301103)。

摘　　要：基于平面应变压缩实验,在温度为623和673 K、应变速率为0.0003、0.03、0.05和0.1 s^-1条件下对AZ80镁合金的高温应力应变变化规律进行热模拟研究,建立了应变补偿的Arrhenius本构模型和基于蠕变方程的少参数本构模型。当应变速率为0.03~0.1 s^-1时,两种模型流变应力预测值和实验值的平均相对误差分别为2.8%和3.77%,两种模型的预测精度均较高。在小应变速率0.0003 s^-1时,基于蠕变方程的少参数本构模型的流变应力预测值平均相对误差为6.2%,预测精度高于应变补偿的Arrhenius本构模型。将两种模型导入有限元软件ABAQUS中,在温度为653 K、应变速率为0.0003和0.05 s^-1条件下进行等温热压缩模拟,获得载荷-位移曲线。结果表明,在小应变速率下,基于蠕变方程的少参数本构模型的模拟结果和实验结果能更好吻合。Based on plane strain compression experiments,the thermal simulation study for the stress and strain variation law of AZ80 magnesium alloy at high temperature was carried out at 623 and 673 K and strain rate of 0.0003,0.03,0.05 and 0.1 s^-1,and the strain compensated Arrhenius constitutive model and constitutive model with less parameter based on creep equation were established.When the strain rate is 0.03-0.1 s^-1,the average relative error between the prediction value and the experimental value of the two models of flow stress is 2.8%and 3.77%,respectively,the prediction accuracy of the two models is high.At the low strain rate of 0.0003 s^-1,the average relative error of prediction value of constitutive model with less parameter based on creep equation is 6.2%,and the prediction accuracy is higher than that of the strain compensated Arrhenius constitutive model.The isothermal thermal compression experiment was carried out at 653 K and strain rate of 0.0003 and 0.05 s^-1 by using the two models in ABAQUS,and the load-displacement curves were obtained.The results show that the simulation result of the constitutive model with less parameter based on creep equation is better consistent with the experimental results at the low strain rate.

关 键 词：AZ80镁合金 平面应变压缩 本构模型 应变补偿 有限元 

分 类 号：TG146.2[一般工业技术—材料科学与工程]