인코넬 육성용접에 의한 원형 문풀구조 선체블록의 열변형해석
Thermal Distortion Analysis by Inconel Over-lay at Circular Moonpool Structures
0
조회
0
다운로드
3
인용
0
참고문헌
키워드
초록
One of the main features of Drillship or FPSO is a moonpool structure. The moonpool structures have various accuracy tolerances according to their functions and targets. This study is mainly interested in roundness of a circular moonpool structure in FPSO. Because this structure needs abrasion-resistance at which bearing of machine touches on inner wall of moonpool, we should do over-lay welding widely and deeply by using Inconel weld material. But a general over-lay can cause a severe distortion at ship block structure. If we can analyze the roundness by thermal distortion under Inconel over-lay, we can establish a special erection policy by the results. In this study, we designed stress-strain curve for strain-boundary condition analysis by an elasto-plastic material property. The results made us to decide an appropriate ship-block size and policy of crane manipulation will follow for its capacity. If a structure that needs over-lay is not large, solid elements also are not a bad choice for FEM modeling. Therefore we also developed a standard of using strain-boundary method that shell elements are used as over-lay on solid element modeling.
Abstract
One of the main features of Drillship or FPSO is a moonpool structure. The moonpool structures have various accuracy tolerances according to their functions and targets. This study is mainly interested in roundness of a circular moonpool structure in FPSO. Because this structure needs abrasion-resistance at which bearing of machine touches on inner wall of moonpool, we should do over-lay welding widely and deeply by using Inconel weld material. But a general over-lay can cause a severe distortion at ship block structure. If we can analyze the roundness by thermal distortion under Inconel over-lay, we can establish a special erection policy by the results. In this study, we designed stress-strain curve for strain-boundary condition analysis by an elasto-plastic material property. The results made us to decide an appropriate ship-block size and policy of crane manipulation will follow for its capacity. If a structure that needs over-lay is not large, solid elements also are not a bad choice for FEM modeling. Therefore we also developed a standard of using strain-boundary method that shell elements are used as over-lay on solid element modeling.
참고문헌 (10)
- 하윤석, "고유변형도를 경계조건으로 갖는 대형 각(殼) 구조물열변형 해석법 개발", 대한조선학회 논문집, 45(1), pp.93~100 (2008), 대한조선학회
- 하윤석, "대형 용접구조물의 탄소성 열변형 해석을 위한 용접부의 변형률 경계조건에 관한 연구", 대한용접접합학회지, 29(4), pp.410~415 (2011), 대한용접접합학회
- Ha, Y.S., "An Improved Inherent Strain Analysis for Plate Bending by Line Heating Considering Phase Transformation of Steel", International Journal of Offshore and Polar Engineering, 17(2), pp.139~144 (2007)
- 한성우, "FPSO Moon Pool 구조의 용접변형과 잔류응력에 관한 연구", 대한조선학회 논문집, 48(5), pp.473~478 (2011), 대한조선학회
- 서승일, "A study on the prediction of deformations of plates due to line heating using a simplified thermal elasto-plastic analysis", Journal of Ship Production, 13(1), pp.22~27, Society of Naval Architects and Marine Engineers
- Jang, C.D., "A Study on the Prediction and Control of Welding Deformations of Ship Hull Blocks", Journal of the Society of Naval Architects of Korea, 37(2), pp.127~136 (2000)
- 김종태, "고유변형도 기반 열변형부의 후속 하중에 기인한 용접 후 변형 해석", 대한조선학회 논문집, 43(2), pp.220~227 (2006), 대한조선학회
- Masubuchi, K., "Analysis of Welded Structures" (1980), Pergamon Press
- STOODY A thermadyne Company, "Stoody 625Ll-T1 Gas Shielded Flux Cored Wire", PDS-SP-029 Revision1, ~ (2007)