2021 Volume 77 Issue 2 Pages I_307-I_317
Effective notch stress method is one of the general methods to predict fatigue life from weld toe and root. However, there is a probability to give over the conservative results and there’s no description for angular distortion in the guideline. On the other hand, the effective stress concentration factor proposed in recent years, which is based on the stress range on the tensile side, shows a high correlation with fatigue property of some weld joint types. In this research, fatigue experiments and modified ENS method proposal are conducted for butt weld joint with backing plate. Regarding the stress range, the accuracy of the result using tensile stress range with angular distortion was the closest to the experiment results. And S-N diagrams are modified by the suggested equations for effective stress concentration factor at weld toe and root. It is found that the fatigue life can be evaluated uniformly with a high accuracy for four weld joints by proposed method.
