Validation of multiaxial fatigue criteria application to lifetime calculation of S355 steel under cyclic bending-torsion loading

摘要

The paper presents the validation of two multiaxial fatigue criteria with the implemented concept of life dependent material parameters. The recent research exhibits that an application of damage parameter defined by multiaxial fatigue criterion to lifetime calculation requires substituting material constants with the fatigue characteristic. The damage parameter is compared with the stress amplitude of given fatigue characteristic and in the result, the fatigue life is calculated. Since the introduced fatigue characteristics are also the function of a number of cycles to failure the calculation process of the final lifetime becomes complex. This life depended material parameter concept was successfully implemented into a few well-known fatigue criteria. The main aim of the paper is the validation of two multiaxial fatigue criteria under high cycle fatigue regime with the application of the life dependent material parameters.