Abstract

Treatment of stress multiaxiality in fatigue assessment is practically important in many components subjected to cyclic loading during their operation. Based on the results of fatigue tests on hollow and solid bar specimens of SUS316NG and SGV410 under various combinations of axial and torsional stresses, accuracy of fatigue life prediction based on the conventional parameters as well as a two parameter approach newly proposed here was studied. The conventional parameters tended to provide conservative prediction of the failure life for shear-dominated cases especially for SUS316NG while the new approach was able to give more realistic prediction of failure lives.

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