基于Norton-Hoff粘塑性理论的铝合金拼焊板成形性能预测与实验研究  

Formability prediction and experimental study on aluminum alloy tailor welded blanks based on Norton-Hoff viscoplastic theory

作　　者：伍杰[1] 毛祖莉[1] 邹帆 Wu Jie;Mao Zuli;Zou Fan(College of Intellegent Manufacutre and Mechanical Engineering,Hunan Institute of Technology,Hengyang 421002,China)

机构地区：[1]湖南工学院智能制造与机械工程学院,湖南衡阳421002

出　　处：《锻压技术》2022年第5期109-115,共7页Forging & Stamping Technology

基　　金：湖南省自然科学基金面上项目(2021JJ30205);湖南省教育厅重点项目(19A122);湖南工学院项目(2019HY025);湖南省科技计划项目(2021RC1008)。

摘　　要：铝合金拼焊板是汽车轻量化技术的重要发展方向之一,其成形性能是关键的性能指标参数。采用基于Norton-Hoff粘塑性理论的有限元方法,模拟了AA5754铝合金拼焊板极限拱顶高度实验的成形过程。分析了成形高度分别为20和29 mm时,铝合金拼焊板中应变和位移的分布情况,预测了AA5754铝合金拼焊板的成形性能。在极限拱顶高度实验中,等效应变沿着成形轮廓线路径呈M形对称分布,最大等效应变出现在冲头与板材接触的边缘位置。有限元预测结果与实验结果有着较好的吻合度,极限拱顶高度实验得出,铝合金拼焊板的LDH值为29.5 mm,断裂位置位于冲头与板材接触的边缘。Aluminum alloy tailor welded blank is one of the important development directions for automobile lightweight technology,and its formability is a key performance index parameter.Therefore,the forming process of limiting dome height test for AA5754 aluminum alloy tailor welded blank was simulated by the finite element method based on Norton-Hoff viscoplastic theory,and the distribution conditions of strain and displacement in the aluminum alloy tailor welded blank was analyzed when the forming heights were 20 and 29 mm,respectively.Then,the formability of AA5754 aluminum alloy tailor welded blank was predicted.Furthermore,during the limiting dome height test,the equivalent strain was distributed symmetrically in an M-shape along the forming contour path,and the maximum equivalent strain appeared at the contact edge between punch and plate.The conclusion shows that the results of finite element prediction are in good agreement with the test results,and it can be obtained from the limiting dome height test that the LDH value for the aluminum alloy tailor welded blank is 29.5 mm,and the fracture position is located at the contact edge between punch and plate.

关 键 词：铝合金拼焊板 成形性能 Norton-Hoff粘塑性理论 极限拱顶高度 成形轮廓线路径 

分 类 号：TG386[金属学及工艺—金属压力加工]