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J. Ocean Eng. Technol. > Volume 25(5); 2011 > Article
J. Ocean Eng. Technol. 2011;25(5):47-51.
DOI: https://doi.org/10.5574/KSOE.2011.25.5.047   
Estimation Fatigue Life of Weldments by Notch Stress Approaches
Yang Park-Dal-Chi,Song Joon-Kyu
School of Naval Architecture and Ocean Engineering Univ. of Ulsan,School of Naval Architecture and Ocean Engineering Univ. of Ulsan
노치응력법에 의한 용접 연결부 피로수명 추정에 관한 연구
울산대학교 조선해양공학부,울산대학교 조선해양공학부
Key Words: Local stress, Fatigue effective notch stress, Critical distance, Finite fatigue life
핵심용어: 국부응력, 유효노치피로응력, 임계거리, 유한피로수명
This paper analyzes the fatigue-life of welded joints using the notch stress approach. In the notch stress approach, the notch effects are usually approximated by introducing weld-bead parameters for the local detailed weld joints. The actual bead shape is complex and 3-dimensional. It may also greatly influence the fatigue strength. In this study, the welded shape was modeled using a 3D-scanner. The critical distance method was adopted in the evaluation of the fatigue effective notch stress for the weldments. Fatigue life tests were performed to verify the present method of fatigue life estimation for two types of welded plates with longitudinal attachments. The estimated results of the present methods were applied to the results of the experiment. The results of the analysis showed that the scatter of fatigue-life for the experimental data expressed in the nominal stress was significantly reduced by applying the effective fatigue stress of the present study.


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