Investigation of multiaxial fatigue in the prospect of turbine disc applications: Part II – Fatigue criteria analysis and formulation of a new combined one

Different multiaxial fatigue criteria, including those based on octahedral shear stress amplitude combined with hydrostatic pressure, and more recent models based on critical plane approaches are evaluated using the multiaxial fatigue experimental data generated in the present study. This includes various loading conditions (tension/torsion, tension/internal pressure, biaxial). The analyses show that none of them is able to correctly correlate all the considered uniaxial and multiaxial conditions. A new combined criterion is then proposed that offers a possible compromise and significantly improves the predictions.