锻压技术

铸铝自冲铆接接头裂纹扩展行为研究及仿真预测

英文标题：Research and simulation prediction on crack propagation behavior for cast aluminum self-piercing riveting joints

作者：胡晓雅1 2 黄理2 3 陈秋任2 3 张净宜2 谭国笔2 张永发2 4 韩维建2 3 王显会1

单位：1. 南京理工大学 2. 长三角先进材料研究院 3. 南京工业大学 4. 重庆大学

关键词：铸铝自冲铆裂纹损伤 GISSMO损伤失效

分类号：TG938

出版年,卷(期):页码：2023,48(9):113-118

摘要：

为了研究铸铝在自冲铆接工艺中的裂纹扩展行为，以5754铝板和Aural2铸铝为搭接组合的自冲铆接接头为研究对象，通过中断试验近似还原了接头剖面裂纹产生的位置和裂纹形貌，讨论了自冲铆接过程中接头内部铸铝材料的裂纹扩展机制，并进行了仿真分析，开展了几何形貌和裂纹预测。结果表明，铸铝自冲铆接接头裂纹产生的位置主要有两处：一处位于自冲铆接接头底面与模具接触一侧，裂纹在铆钉刚接触下板时产生，随着铆钉压入而增多；另一处位于铆钉钉腿与上下板形成互锁处的下板铸铝材料上，裂纹在形成互锁过程中产生，随着铆钉下压不断增长。建立的基于GISSMO损伤失效的铆接仿真模型，仿真结果的形貌轮廓与试验剖面的几何形貌一致，单元损伤与接头裂纹一致，可以对接头剖面几何形貌和裂纹位置进行准确预测。

In order to study the crack propagation behavior of cast aluminum in self-piercing riveting process, for a self-piercing riveting joint composed of 5754 aluminum plate and Aural2 cast aluminum, the location of the crack in joint profile and the morphology of crack were approximately restored by interrupted experiments. Then, the crack propagation mechanism of cast aluminum material inside the joint during the self-piercing riveting process was discussed, and the simulation and analysis was conducted to predict the geometric morphology and crack. The results show that there are two main locations where the cracks of cast aluminum self-piercing riveting joints occur, one is located on the side where the bottom surface of the self-piercing riveting joint is in contact with the mold, and the cracks occur when the rivets just contact the lower plate, and increase as the rivets are pressed in. The other is on the cast aluminum material of the lower plate where the rivet legs interlock with the upper and lower plates, and the cracks occur during the interlocking process and continue to grow as the rivets are pressed down. The riveting simulation model based on GISSMO damage failure is established, the morphology and contour of the simulation results are consistent with the geometric morphology of the test section profile, and the unit damage is consistent with the joint crack, which can accurately predict the geometric morphology and crack location of the joint profile.

基金项目：

国家自然科学基金青年基金资助项目（52205377）；苏州市基础研究基金资助项目（SJC2022031）

作者简介：胡晓雅（1997-），女，硕士 E-mail：huxy@jitriamrd.com 通信作者：黄理（1989-），男，博士，研究员 E-mail： hli@jitriamrd.com

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