A novel constitutive model for two-stage creep aging process of 7B50 aluminum alloy and its application in springback prediction  

7B50铝合金双级蠕变时效工艺的新型本构模型及其在回弹预测中的应用

作　　者：Ling-zhi XU Can-yu TONG Chang-zhi LIU Li-hua ZHAN Ming-hui HUANG You-liang YANG Dong-yang YAN Jian-hua YIN Hui XIA Yong-qian XU 徐凌志;童璨瑜;刘长志;湛利华;黄明辉;杨有良;鄢东洋;尹建华;夏慧;徐永谦(中航通飞华南飞机工业有限公司,珠海519000;中南大学极端服役性能精确制造全国重点实验室,长沙410083;中南大学轻合金研究院,长沙410083;北京宇航系统工程研究所,北京100076)

机构地区：[1]AVIC General Huanan Aircraft Industry Co.,Ltd.,Zhuhai 519000,China [2]State Key Laboratory of Precision Manufacturing for Extreme Service Performance,Central South University,Changsha 410083,China [3]Light Alloy Research Institute,Central South University,Changsha 410083,China [4]Beijing Institute of Astronautical Systems Engineering,Beijing 100076,China

出　　处：《Transactions of Nonferrous Metals Society of China》2025年第3期734-748,共15页中国有色金属学报(英文版)

基　　金：supported by the National Key R&D Program of China(No.2021YFB3400900);the National Natural Science Foundation of China(Nos.52175373,52205435);Natural Science Foundation of Hunan Province,China(No.2022JJ40621);the Innovation Fund of National Commercial Aircraft Manufacturing Engineering Technology Center,China(No.COMACSFGS-2022-1875)。

摘　　要：A new unified constitutive model was developed to predict the two-stage creep-aging(TSCA)behavior of Al-Zn-Mg-Cu alloys.The particular bimodal precipitation feature was analyzed and modeled by considering the primary micro-variables evolution at different temperatures and their interaction.The dislocation density was incorporated into the model to capture the effect of creep deformation on precipitation.Quantitative transmission electron microscopy and experimental data obtained from a previous study were used to calibrate the model.Subsequently,the developed constitutive model was implemented in the finite element(FE)software ABAQUS via the user subroutines for TSCA process simulation and the springback prediction of an integral panel.A TSCA test was performed.The result shows that the maximum radius deviation between the formed plate and the simulation results is less than 0.4 mm,thus validating the effectiveness of the developed constitutive model and FE model.针对Al-Zn-Mg-Cu合金双级蠕变时效行为建立一套新的统一本构模型。通过考虑不同温度下主要微观特征量演变规律及其相互作用,分析了合金特有的双峰型析出相特征,还引入了位错密度来描述蠕变变形对析出的影响。该模型采用透射电子显微图片的定量分析结果以及先前研究中获得的实验数据进行拟合。随后,本构模型被编译成用户子程序,嵌入有限元软件ABAQUS中,用于整体壁板双级蠕变时效工艺过程的模拟和回弹预测。同时进行了相应的整体壁板双级蠕变时效成形实验。测量结果表明,实验成形回弹半径与仿真模拟回弹半径之间的最大偏差小于0.4 mm,证明所建立的本构模型和有限元模型的有效性。

关 键 词：two-stage creep aging process bimodal precipitation constitutive modeling springback prediction Al−Zn−Mg−Cu alloy 

分 类 号：TG1[金属学及工艺—金属学]