APPLICABILITY OF EFFECTIVE NOTCH STRESS CONCEPTION TO FATIGUE STRENGTH EVALUATION FOR CRUCIFORM WELDED JOINTS FAILING FROM WELD ROOT

Abstract

In the IIW Fatigue Design Recommendations, the fatigue strength evaluation method using effective notch stress has been specified in addition to the one using nominal stress and hot spot stress. Fatigue cracks are prone to occur from weld roots in load carrying type of cruciform welded joints, and fatigue crack propagation analysis is effective to evaluate fatigue strength of those joints. In this study, the fatigue strength obtained by effective notch stress conception is compared with one by fatigue crack propagation analysis, and applicability of effective notch stress conception to fatigue strength evaluation for cruciform welded joints failing from weld root has been discussed.