유조선 종통보강재와 횡늑골 연결부의 피로강도 평가용 자동화 시스템 개발
Development of Evaluation System for Fatigue Strength on the Connection Between Longitudinals and Transverse Web
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초록
Ship structure is composed of the welded mixture members which are plate and stiffeners. Ship structure is also influenced by variable loadings such as wave and inertia load. There have been several fatigue damage problems on the connection between longitudinal and transverse web due to wide usage of high tensile steel and adoption of wide web space to improve shipbuilding productivity. It is impossible to estimate the fatigue lives for all connection details through refined fatigue analysis. It is necessary to use the simplified approach for the fatigue life estimation of the connection details. PLUS analysis, which is suggested by the classification society, is one of the simplified approaches and is widely adopted to get fatigue lives for the connection details along whole cargo hold area. However, ship building yards still have difficulties to get fatigue lives due to large amount of calculation and time even if this approach reduce the time and amount of calculation. This paper treats the computing system developed to reduce efforts of estimating the fatigue lives. The influence factors of mean shear stress and local dynamic pressure are easily calculated and fatigue lives for all hot spots can be estimated automatically by the developed computing system. It is possible to reduce computing time and efforts to get the fatigue lives for the connection details between longitudinals and transverse webs along the ship. This system was applied to get fatigue lives on the connection details of a VLCC and verified the availability.
Abstract
Ship structure is composed of the welded mixture members which are plate and stiffeners. Ship structure is also influenced by variable loadings such as wave and inertia load. There have been several fatigue damage problems on the connection between longitudinal and transverse web due to wide usage of high tensile steel and adoption of wide web space to improve shipbuilding productivity. It is impossible to estimate the fatigue lives for all connection details through refined fatigue analysis. It is necessary to use the simplified approach for the fatigue life estimation of the connection details. PLUS analysis, which is suggested by the classification society, is one of the simplified approaches and is widely adopted to get fatigue lives for the connection details along whole cargo hold area. However, ship building yards still have difficulties to get fatigue lives due to large amount of calculation and time even if this approach reduce the time and amount of calculation. This paper treats the computing system developed to reduce efforts of estimating the fatigue lives. The influence factors of mean shear stress and local dynamic pressure are easily calculated and fatigue lives for all hot spots can be estimated automatically by the developed computing system. It is possible to reduce computing time and efforts to get the fatigue lives for the connection details between longitudinals and transverse webs along the ship. This system was applied to get fatigue lives on the connection details of a VLCC and verified the availability.
참고문헌 (10)
- 정준모, "부유식 해양구조물의 완전 통계적 피로평가 프로그램 개발", 대한조선학회 논문집, 44(4), pp.425~438 (2007), 대한조선학회
- Det Norske Veritas, "Fatigue Assessment of Ship Structures, Classification Notes No.30.7", ~ (1998)
- Det Norske Veritas, "Fatigue Strength Estimation of Cargo Area, Addendum of Classification Notes No. 30. 7", ~ (2000)
- 김명현, "필릿 용접구조물의 피로해석을 위한 기준응력에 대한 비교 연구", 대한조선학회 논문집, 43(4), pp.476~483 (2006), 대한조선학회
- 강성원, "필릿 용접부의 면외굽힘하중에 대한 피로강도", 대한조선학회 논문집, 40(1), pp.4~35 (2003), 대한조선학회
- 강성원, "Longi-web 연결부의 피로강도 평가에 관한 실험적 연구", 대한조선학회 논문집, 45(1), pp.87~92 (2008), 대한조선학회
- Kim J.J., "An Efficient Algorithm in Spectral Fatigue Analysis of Ship Structures", Transactions of the Society of Naval Architects of Korea, 30(4), pp.93~101 (1993)
- 김명현, "필릿 용접구조물의 피로해석을 위한 기준응력에 대한 비교 연구", 대한조선학회 논문집, 43(4), pp.476~483 (2006), 대한조선학회
- Lee S.W., "Structural Strength and Fatigue Strength Assessment for Fore", Aft Cargo Hold of 60m Beam VLCC, 2005, 84~89
- Seo J.K., "A Benchmark Study on the Reference Stress to Supply the Fatigue Analysis of Welded Structures", Proceedings of the Annual Autumn Meeting, SNAK, pp.382~387 (2004)