Abstract
Fatigue failure is one of the essential failure modes to be considered in the design of light water reactor plants. Treatment of stress multiaxiality in the fatigue assessment is of practical importance for many components subjected to multiaxial cyclic loading during operation. Based on the results of multiaxial fatigue tests on hollow and solid bar specimens of SUS316NG and SGV410 under combined axial and torsional loading, accuracy of fatigue life prediction based on the conventional parameters as well as a newly proposed two parameter approach proposed here was studied. The conventional parameters tended to provide conservative life prediction for the case of shear-dominated cases especially for 316NG while the new approach was able to give more realistic prediction.
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