Influence of structural stiffness on welding deformation of thin-walled box beam
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摘要: 目前基于工艺参数、焊接顺序和拘束度对焊接变形影响的研究虽多，但有关焊接结构刚度对焊接变形影响的研究仍较少。利用T形接头进行三维热弹塑性有限元分析，在试验验证其合理的基础上，利用逆解析法在瞬态焊结果中提取四成分固有应变数据，并基于固有应变理论的弹性有限元方法对薄壁箱型梁结构进行焊接变形预测，定量研究腹板间距和高度对焊接变形的影响。研究表明，腹板间距的增大在一定范围内使结构整体焊接变形减小，两者之间呈现一次函数关系；腹板高度的增加在一定范围内也使结构整体焊接变形减小，两者之间呈现二次函数关系。Abstract: At present,there are many researches on the influence of welding parameters,welding sequence and constraint conditions on welding deformation,but there are few scientific researches on the influence of structural stiffness on welding deformation. In this study,the threedimensional thermal elastic-plastic finite element analysis of T-joint was carried out. Four components of inherent strain were extracted using inverse analytic method in the results of thermal elastic-plastic FEM. The inherent strain was proved to be reasonable by the experiment. Based on the inherent strain theory,the elastic finite element method was used to predict the deformation of thin-walled box beam. Finally,the influences of web space and height on welding deformation were studied quantitatively. Numerical results showed that the welding deformation of the thin-walled box beam was reduced with the increase of the web space in a certain range,and a linear function was established. The welding deformation was also reduced with the increase of the web height in a certain range,and a quadratic function was established.
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Keywords:
- inherent strain /
- thin-walled box beam /
- structural stiffness /
- welding deformation
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