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J. Ocean Eng. Technol. > Volume 26(2); 2012 > Article
J. Ocean Eng. Technol. 2012;26(2):26-32.    
DOI: https://doi.org/10.5574/KSOE.2012.26.2.026   

Modified S-N Curve Method to Estimate Fatigue life of Welded Joints
Yang Park-Dal-Chi,Kim Mi-Kyeong
University of Ulsan School of Naval Architecture and Ocean Engineering,Hyundai maritime Research Institute - Hyundai Heavy Industry Co. Ltd.
수정 S-N곡선법을 이용한 용접연결부의 피로수명 추정
울산대학교 조선해양공학부,현대중공업(주) 선박해양연구소
Copyright © 2012 The Korean Society of Ocean Engineers     Open access / Under a Creative Commons License
Key Words: Weld joints, Finite fatigue life, Multiaxial fatigue, Critical plane, Critical distance method
핵심용어: 용접연결부, 유한피로수명, 다축피로, 임계평면, 임계거리법
In this paper, the effects of irregular bead shapes on fatigue life were investigated. A modified S-N curve method was used to estimate the fatigue life, which considered the inherent multiaxiality caused by the geometrical feature produced by the welding process. The point method of the critical distance method was used to determine the fatigue effective stress. Three types of fillet joint models were tested in the fatigue experiments. For each model, real bead shapes were collected using a 3D laser scanner, and finite element analyses were performed. The results of the analyses with actual bead shapes were compared with those using an idealized bead shape model. The results of the present analytical methods showed good agreement with the experimental results.


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