선체 용접부의 균열진전 및 피로수명 예측에 관한 연구(I)
A Study of Crack Propagation and Fatigue Life Prediction on Welded Joints of Ship Structure(I)
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초록
The fatigue life of ship structure under cyclic loading condition is made up of initiationand propagation stages. In this study, crack growth test is carried out on large scale structure test specimens and fracture mechanical analysis is performed. The fatigue lives measured from fatigue tests are compared with DNV, Matsuoka and BS 5400 S-N curve. And topredict the crack initiation life, S-N curve, corresponding to crack length 20mm at welded joint, is developed based on hot spot stress range. Also crack propagation life is calculated using crack growth equation. Consequently, computed crack propagation life is compared with experiment results.
Abstract
The fatigue life of ship structure under cyclic loading condition is made up of initiationand propagation stages. In this study, crack growth test is carried out on large scale structure test specimens and fracture mechanical analysis is performed. The fatigue lives measured from fatigue tests are compared with DNV, Matsuoka and BS 5400 S-N curve. And topredict the crack initiation life, S-N curve, corresponding to crack length 20mm at welded joint, is developed based on hot spot stress range. Also crack propagation life is calculated using crack growth equation. Consequently, computed crack propagation life is compared with experiment results.
참고문헌 (8)
- Det Norske Veritas(DNV), "Fatigue Assessment of Ship Structures, Classification Notes, No. 30.7" (2003)
- Jeon, Y.C, "A Study on Fatigue Life Prediction of Welded Joints Through Fatigue Test and Crack Propagation Analysis", Journal of the Society of Naval Architects of Korea, 38(3), pp.93~106 (2003)
- 김창욱, 노인식, 김대수, "균열전파해석에 의한 선체의 피로수명 평가법 -응력강도계수의 간이추정법-", 대한조선학회 논문집, 39(1), pp.10~99 (2002), 대한조선학회
- Lee, C.K, "Crack Propagation Analysis of VLCC Using Simplified K value Estimation Methods", Korean Society of Steel Construction, 13(1), pp.17~25 (2001)
- Matsuoka, K, "An Evaluation Method on Fatigue Crack Initiation Life at Welded Joints in Steel Structures", Journal of the Society of Naval Architects of Japan, 178, pp.513~522 (1995)
- Newman, J.C, "An Empirical Stress-Intensity Factor Equation for the Surface Crack", Engineering Fracture Mechanics, 15, pp.185~192 (1981)
- Steel Concrete and Composite Bridges Code of Practice for Fatigue, , ~, pp.The British Standards Institution BS5400 (1980)
- Verreman, Y, "Fatigue Life Prediction of Welded Joints-A Re-Assessment", Fatigue & Fracture of Engineering Materials and Structure, 10(1), pp.17~36 (1987)