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Publishing Language: Chinese

Effect of welding initial imperfections on the ultimate strength of hull girder

Huwei CUI1,2,3( ), Runwen HU1, Zemin CHEN1, Lu HUANG4
School of Shipping and Naval Architecture, Chongqing Jiaotong University, Chongqing 400074, China
Hubei Key Laboratory of Inland Shipping Technology, Wuhan 430063, China
Chongqing High-tech Development and Construction Investiment Group Co., Ltd., Chongqing 401329, China
China Ship Development and Design Center, Wuhan 430064, China
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Abstract

Objectives

The aim of this paper is to evaluate the longitudinal ultimate strength of a hull girder more accurately and determine its collapse process.

Methods

A bulk carrier is finely modeled in nonlinear finite element software ABAQUS, and the effects of slight, average, and severe welding initial deformations and average welding residual stress on the ultimate strength of the hull girder under hogging and sagging bending moments are 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. 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 deformations individually.

Conclusions

The combined effect of welding initial deformation and residual stress on a hull girder's ultimate strength should be considered more carefully in research on the ultimate strength of hull girders.

Keywords

hull girdersstructural analysisultimate strengthwelding initial deformationwelding residual stressfinite element methodABAQUS
CLC number: U661.43 Document code: A

References

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Chinese Journal of Ship Research
Volume 19 Issue 6,
December 2024
Pages 248-256
DOI: 10.19693/j.issn.1673-3185.03476

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Cite this article:
CUI H, HU R, CHEN Z, et al. Effect of welding initial imperfections on the ultimate strength of hull girder. Chinese Journal of Ship Research, 2024, 19(6): 248-256. https://doi.org/10.19693/j.issn.1673-3185.03476

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Received: 26 July 2023
Revised: 18 September 2023
Published: 10 October 2024
© 2024 Chinese Journal of Ship Research.