钢-铝搅拌摩擦焊接头的孔洞参数化建模和仿真  

Parametric Modeling and Simulation Analysis of Voids in Steel-Aluminum FSW Joints

作　　者：吴海峰 许莎 杨亚莉 WU Haifeng;XU Sha;YANG Yali(School of Mechanical and Automotive Engineering,Shanghai University of Engineering Science,Shanghai 201620,China)

机构地区：[1]上海工程技术大学机械与汽车工程学院,上海201620

出　　处：《轻工机械》2023年第5期52-59,共8页Light Industry Machinery

摘　　要：为探究钢-铝搅拌摩擦焊(friction stir welding, FSW)接头中不同特征的孔洞缺陷对应力分布的具体影响,课题组利用CATIA二次开发程序对孔洞缺陷开展仿真研究。首先,根据钢-铝焊接接头的特点对孔洞和基体进行简化,为量化分析提供基础;然后,编写CATIA二次开发程序对孔洞进行参数化建模,同时建立基体模型,并对孔洞和基体模型进行布尔操作生成接头模型;最后,利用ABAQUS软件对接头模型进行仿真分析,得到孔洞不同特征变量对钢-铝FSW接头的影响。结果表明:孔洞的参数化建模可以很好地提高建模效率;空间角度α和β对应力分布的影响较大,而空间角度γ对应力分布的影响较小;在空间角度相同时,表面孔洞的应力集中系数大于内部孔洞的应力集中系数,表面孔洞的危险程度更大;且应力集中程度最高的位置位于钢-铝交接处。参数化建模和仿真方法为孔洞危险程度的评估提供了一定参考。In order to study the specific effects of void defects with different characteristics on stress distribution in steel-aluminum friction stir welding(FSW) joints, the CATIA secondary development program was used to carry out simulation studies on void defects. Firstly, the void and base metal were simplified according to the characteristics of steel-aluminum FSW joints to provide a basis for quantitative analysis. Then, CATIA secondary development program was written to parametrically model the void and build the base metal model at the same time, and Boolean operations were performed on the void and base metal models to generate the joint model. Finally, the joint model was simulated and analyzed using ABAQUS software to obtain the effects of different characteristic variables of the void on the steel-aluminum FSW joint. The results show that parametric modeling of voids can improve the modeling efficiency well. The effect of spatial angles α and β on stress distribution is greater, while the effect of spatial angle γ on stress distribution is smaller. At the same spatial angle, the stress concentration factor of the surface voids is greater than that of the internal voids, and surface voids are more dangerous. And the location of the highest stress concentration is located at the steel-aluminum intersection. The parametric modeling and simulation methods provide a reference for the evaluation of the danger level of voids.

关 键 词：搅拌摩擦焊 孔洞缺陷 钢-铝接头 应力集中系数 CATIA软件 

分 类 号：TG406[金属学及工艺—焊接] TH142[一般工业技术—材料科学与工程]