In-Phase and Out-of-Phase Combined Bending-Torsion Fatigue of a Notched Specimen

摘要

An experimental study of the high-cycle biaxial fatigue behavior of notched specimens is reported. Solid round bars of l%Cr-Mo-V steel having a circumferential semicircular groove were tested under fully reversed constant-amplitude bending, torsion, and combined bending and torsion, in-phase, and 90° out-of-phase. Smooth specimens of the same material were also tested under bending as well as torsion to provide baseline data. Observed fatigue life data are used to evaluate several multi-axial fatigue life prediction models, including a critical plane method, a von Mises approach, and an energy-based approach. Crack growth behavior as observed on the surface in smooth and notched specimens is presented and discussed.