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Finite Element Analysis of Ultimate Strength of Flexible Risers Subject to Axial Compression Using Simplified Model : 축 압축력을 받는 유연식 라이저의 극한 강도의 간략화 모델을 이용한 유한 요소 해석
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- Authors
- Advisor
- 장범선
- Major
- 공과대학 조선해양공학과
- Issue Date
- 2017-08
- Publisher
- 서울대학교 대학원
- Keywords
- flexible risers ; ultimate strength assessment ; failure mode ; nonlinear FE analysis ; simplified FEdkdjld
- Description
- 학위논문 (석사)-- 서울대학교 대학원 공과대학 조선해양공학과, 2017. 8. 장범선.
- Abstract
- Flexible risers are pipes connecting the offshore platform to the subsea flow line and transporting gas and oil. Flexible risers can encounter many uncertain factors during their installation and operation process. Especially, during installation process, due to the pressure unbalance, flexible risers can be subject to axial compression, which is an undesirable force. Axial compression can result in failure modes such as radial buckling. Therefore, it is very necessary to analysis failure modes and to evaluate the ultimate strength of flexible risers. Ultimate strength assessment of flexible risers is very complicated and time-consuming. This is because it includes many difficult points such as material nonlinearity, large deformation, and nonlinear contact mechanism. Also, it is difficult to understand structural behaviors under various loads. This paper introduces practical and stable methods for ultimate strength assessment using simplified FE models. In particular, numerical methods are provided to increase convergence of nonlinear analysis. In addition, the effects of ovalizations and external pressure are examined.
- Language
- English
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