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다균열 간섭, 합체, 성장이론을 고려한 십자형 필렛용접 이음부의 피로균열진전수명 평가
한정우(Jeongwoo Han),한승호(Seungho Han),신병천(Byungchoen Shin),임전(Jeon Rim),김재훈(Jaehoon Kim) 대한기계학회 2004 대한기계학회 춘추학술대회 Vol.2004 No.4
Fatigue life of welded joints are governed by the propagation of multiple collinear surface cracks distributed randomly along weld bead. These cracks propagate in mutual interaction and coalescence of them. To estimate the fatigue life, the influences of above two mechanisms on the fatigue life should be taken into account. These two mechanisms appear through the stress intensity factors disturbed mutually. However, it is difficult to calculate the stress intensity factors of multiple surface cracks located in vicinity of weld toe. The stress intensity factors are calculated normally by using the Mk -factors, but such Mk-factors are very rare in literature. In this study, the Mk-factors were obtained from a parametric study on crack length and depth, in which a finite element method is used. A fatigue test for a cruciform welded joint was conducted. The fatigue life of the tested specimen was estimated through present method with the informations obtained from the test, e.g. the number, size and locations of the cracks. The estimated and measured fatigue life showed a good agreement.