잔류응력을 고려한 피로수명평가법의 적용성 검토(I) - 다양한 용접연결부에 대한 적용 -

Application of Fatigue Life Assessment considering Residual Stresses for Various Welded Details

  • 한정우 (한국기계연구원 구조시스템연구부) ;
  • 이탁기 (한국기계연구원 구조시스템연구부) ;
  • 한승호 (한국기계연구원 구조시스템연구부) ;
  • 김재훈 (충남대학교 기계설계공학과)
  • 발행 : 2002.05.17

초록

Authors had developed the model for the fatigue life assessment of welded details considering residual stress and its relaxation. The model consists of three ingredients; a hot-spot stress approach, a residual stress relaxation, and an equivalent stress. The equivalent stress is induced by stress ranges and the ratios between the applied mean stresses and the ultimate stress of material. Once being tuned with two specific fatigue tests by using load carrying cruciform joint, this model can be applied to many kinds of welded details which structural stress concentration factors are different from each other. This paper reports the application of the proposed model for various welded details including cover plate, longitudinal stiffener, gusset and side attachment. From the investigation of predicted results by using the proposed model it was shown that the ambiguous fatigue characteristics of the various details influenced widely by the welding residual stress are clarified, and also the model could be applied to assess fatigue life of general welded structures.

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