Study on welding buckling evaluation method based on inherent strain theory and eigenvalue buckling analysis
Study on welding buckling evaluation method based on inherent strain theory and eigenvalue buckling analysis
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DOI：
10.1080/15376494.2023.2225063
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发表时间：
2023-06
影响因子：
2.8
通讯作者：
Ziliang Li;Meng Li;Ziyang Li;Ye Zhu;Y. Bao
中科院分区：
文献类型：
--
作者：
Ziliang Li;Meng Li;Ziyang Li;Ye Zhu;Y. Bao
焊接屈曲变形是薄板焊接结构最主要的破坏形式之一。焊接屈曲估计对于结构设计和工艺优化具有重要意义。基于固有应变的焊接屈曲评估方法已经被证明是有效的，但现有的方法由于需要多个内力而效率较低。建立了一种新的基于纵向收缩力的焊接屈曲评价方法。以对接焊接接头为例验证了该方法的有效性。此外，将该方法应用于大型薄板结构的稳定性评估，讨论了热输入、焊接方式和外部约束对焊接变形和屈曲的影响。结果表明，本文提出的基于固有应变的焊接屈曲评估方法可以用于判断焊接结构是否发生屈曲。减少焊接热输入和采用单面焊接可以减小焊接变形。增加外部约束不仅可以减小焊接变形，还可以提高焊接临界屈曲载荷，防止焊接屈曲。
Welding buckling deformation is one of the foremost failure modes of thin plate welded structures. It is important to estimate welding buckling for structural design and process optimization. Inherent strain-based welding buckling evaluation methods have been proved to be valid, but the existing methods have low efficiency due to requiring multiple inherent forces. In this study, a novel welding buckling evaluation method based on longitudinal shrinkage force was established. The effectiveness of the proposed method was validated using a butt welded joint. In addition, this method was applied in a large-scale thin plate structure for evaluating the structural stability, the effects of heat input, welding manner, and external constraints on welding deformation and buckling were also discussed. The results reveal that the proposed inherent strain-based welding buckling evaluation method can be used to judge whether welded structures are buckled. The reduction of welding heat input and the use of single-sided welding can mitigate welding deformation. Increasing external constraints can not only reduce the welding deformation, but also improve the welding critical buckling load for preventing welding buckling.