Research on the effect of welding initial imperfections on the ultimate strength of hull girder
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摘要: 【目的】为更准确评估船体梁的总纵极限强度及获取其崩溃失效过程。【方法】通过非线性有限元软件ABAQUS对某双底散货船体梁进行细致建模，充分考虑了轻微、平均、严重水平的焊接初始变形与平均水平的焊接残余应力对中拱、中垂弯矩下船体梁极限强度的影响。【结果】计算结果表明：随着焊接初始变形幅值增加，船体梁的极限强度与抗弯刚度逐步减小。严重水平的焊接初始变形使得某双底散货船体梁极限强度最高下降了14.25%，焊接残余应力单独影响下某双底散货船体梁极限强度最高下降了8.22%。焊接初始变形与残余应力对船体梁极限强度的综合影响，并非是两种初始缺陷单独影响的线性叠加。【结论】在船体梁极限强度研究中有必要更为仔细地考虑焊接初始变形与残余应力对船体梁极限强度的综合影响。Abstract: [Objectives] To evaluate the longitudinal ultimate strength of the hull girder more accurately and obtain its collapse process. [Methods] The bulk carrier was modeled finely by the nonlinear finite element software ABAQUS, and the effects of slight, average, and severe welding initial deformation and average welding residual stress on the ultimate strength of the hull girder under hogging and sagging bending moments were fully considered. [Results] The calculation results show that the hull girder's ultimate strength and bending stiffness decrease gradually with the increase of the initial deformation amplitude. The severe welding initial deformation makes the ultimate strength of the bulk carrier decrease by 14.25 %, and the bulk carrier's ultimate strength decreases by up to 8.22% under the effect of welding residual stress individually. The combined effect of welding initial deformation and residual stress on the hull girder's ultimate strength is not a linear combination of the effects of the two initial imperfections individually. [Conclusions] The combined effect of welding initial deformation and residual stress on hull girders' ultimate strength should be considered more carefully in the research on the ultimate strength of hull girders.
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Key words:
- hull girder /
- ultimate strength /
- welding initial deformation /
- welding residual stress
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