Critical plane approach in stage i and stage ii of fatigue under multiaxial loading

This paper deals with the estimation problem of the critical plane orientation in multiaxial fatigue failure criteria. Experimental results from multiaxial proportional, nonproportional cyclic loading and variable-amplitude bending and torsion were used to determine the macroscopic fracture plane orientations and the fatigue lives. It was concluded that more important than macroscopic fracture plane orientation is the evolution (Stage I, Stage II) of fracture planes and an appropriate choice of the fatigue failure criterion for the fatigue life estimation