Evaluating the limiting state of materials with asymmetric cyclic loading and a complex stress state

Conclusion In order to construct models of the limiting state in asymmetric cyclic loading, it is best to use the representation of a unique limit curve that is invariant to the time to failure and type of stress state. Isotropic metallic materials were used as an example to show that such a curve does exist and is described satisfactorily by an exponential cosine function.The models constructed above were used to calculate the limiting state for several steels and alloys acted upon by the combinations of cyclic bending and cyclic torsion, static bending and cyclic torsion, and static torsion and cyclic bending. Results were also calculated for materials with stress raisers. The calculated data were compared with experimental findings and were shown to agree satisfactorily with the latter.S. P. Timoshenko Institute of Mechanics, National Academy of Sciences of Ukraine, Kiev. Translated from Prikladnaya Mekhanika, Vol. 31, No. 2, pp. 67–79, February, 1995.