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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
| DC Field | Value | Language |
|---|---|---|
| dc.contributor.advisor | 장범선 | - |
| dc.contributor.author | 유동현 | - |
| dc.date.accessioned | 2017-10-31T07:39:35Z | - |
| dc.date.available | 2017-10-31T07:39:35Z | - |
| dc.date.issued | 2017-08 | - |
| dc.identifier.other | 000000146027 | - |
| dc.identifier.uri | https://hdl.handle.net/10371/137425 | - |
| dc.description | 학위논문 (석사)-- 서울대학교 대학원 공과대학 조선해양공학과, 2017. 8. 장범선. | - |
| dc.description.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. | - |
| dc.description.tableofcontents | 1. Introduction 1
1.1. Introduction to Flexible Riser 1 1.2. Research Background 3 1.3. Previous Studies 8 1.4. Research Objective 11 2. Analytical Method 15 2.1. Elastic stiffness of flexible riser 15 2.1.1. Behavior about axisymmetric loads 15 2.1.2. Behavior about bending moment 27 2.2. Analytical Explanation of Radial Buckling 29 3. Research Model 29 3.1. Properties of 2.5-inch Flexible Riser 29 3.2. Simplification of Geometry of Layers 32 4. Numerical Method 35 4.1. Process of Numerical Method 35 4.1.1. Mesh Generation 35 4.1.2. Contact Setting 37 4.1.3. Analysis Setting 41 4.2. Simplification of Composition of Model 43 4.2.1. Determination of EQP 46 4.2.2. Verification of EQP 49 4.2.3. 3D 5-layered Model 50 5. Verification of Model 52 5.1. Axial tension test 52 5.1.1. Solid Model vs Shell Model 53 5.1.2. Isotropic Assumption 57 5.1.3. 8-lyaered Model vs 5-layered Model 59 5.2. Bending Test 61 6. Application to Ultimate Strength Analysis 61 6.1. Radial Buckling 61 7. Conclusion 74 Reference 76 | - |
| dc.format | application/pdf | - |
| dc.format.extent | 2094442 bytes | - |
| dc.format.medium | application/pdf | - |
| dc.language.iso | en | - |
| dc.publisher | 서울대학교 대학원 | - |
| dc.subject | flexible risers | - |
| dc.subject | ultimate strength assessment | - |
| dc.subject | failure mode | - |
| dc.subject | nonlinear FE analysis | - |
| dc.subject | simplified FEdkdjld | - |
| dc.subject.ddc | 623.8 | - |
| dc.title | Finite Element Analysis of Ultimate Strength of Flexible Risers Subject to Axial Compression Using Simplified Model | - |
| dc.title.alternative | 축 압축력을 받는 유연식 라이저의 극한 강도의 간략화 모델을 이용한 유한 요소 해석 | - |
| dc.type | Thesis | - |
| dc.contributor.AlternativeAuthor | Yoo DongHyun | - |
| dc.description.degree | Master | - |
| dc.contributor.affiliation | 공과대학 조선해양공학과 | - |
| dc.date.awarded | 2017-08 | - |
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