Experimental and computational analysis of residual buckling distortion of bead-on-plate welded joint
Experimental and computational analysis of residual buckling distortion of bead-on-plate welded joint
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DOI：
10.1016/j.jmatprotec.2013.02.009
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发表时间：
2013-08
影响因子：
6.3
通讯作者：
Jiangchao Wang;Xianqing Yin;H. Murakawa
中科院分区：
文献类型：
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作者：
Jiangchao Wang;Xianqing Yin;H. Murakawa
选取厚度为2.28mm的试件作为研究对象，对焊接引起的屈曲进行了研究。对试件进行板上珠焊，观察到残余屈曲变形。采用固体单元模型进行热弹塑性（TEP）有限元分析，预测焊接冷却后引起的屈曲。利用步进有限元分析的计算结果对焊接接头的固有变形进行了评价。基于固有变形理论，采用壳体单元模型对试件进行了特征值分析和弹性有限元分析。特征值分析预测了被测焊接接头的屈曲模式和相应的筋力。考虑到大变形和初始挠度，采用弹性有限元法对面外焊接变形进行了预测，结果与实测变形吻合较好。利用固有变形理论阐明了板珠焊接接头屈曲的产生机理。肌腱力（纵向固有收缩）是产生屈曲的主要原因，扰动（初始挠曲或固有弯曲）触发屈曲，但不影响屈曲模式。
A test specimen with a thickness of 2.28mm was selected as the examined object, to investigate welding induced buckling. Bead-on-plate welding was conducted on the test specimen and residual buckling distortion was observed. A thermal-elastic-plastic (TEP) FE analysis using solid elements model was carried out to predict welding induced buckling after cooling. The inherent deformation of the examined welded joint was also evaluated from the computed results of TEP FE analysis. A shell elements model of the test specimen was used for eigenvalue and elastic FE analyses based on the inherent deformation theory. Eigenvalue analysis predicted the buckling mode and corresponding tendon force in the examined welded joint. Considering large deformation and initial deflection, an elastic FE analysis was carried out to predict the out-of-plane welding distortion, which showed a good agreement with measured distortion. The generation mechanism of buckling in bead-on-plate welded joint was clarified employing the inherent deformation theory. The tendon force (longitudinal inherent shrinkage) is the dominant reason to produce buckling and the disturbance (initial deflection or inherent bending) triggers buckling but does not influence the buckling mode.