Study on applicability of multiaxial fatigue parameters to nuclear piping materials

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 speciments of SUS316 NG and SGV410, accuracy of fatigue life prediction based on the conventional parameters as well as a 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. (author)