Author(s)

F. Klubberg, H. J Schaefer, M. Hempen & P. Beiss

Abstract

Empirical relationship between pulsating and fully reversed fatigue strength amplitudes F. Klubberg, H. J. Schaefer, M. Hempen & P. Beiss Institute for Materials Science (IWK), R WTH Aachen University, Aachen, Germany Abstract The fatigue behavior of metallic materials is significantly influenced by superimposed static mean stresses, which must be taken into account in service life calculations or in structure design. This requires a suitable engineering rule to estimate the allowable stress amplitude for any non-zero mean stress. Traditionally, the drop of endurable amplitude with increasing mean stress is approximately calculated from the so-called mean stress sensitivity, which is believed to be a linear function of the tensile strength. In this paper it is shown that a power law between fully reversed and pulsating stress amplitudes is much better suited to predict unknown pulsating tension or bending and torsion amplitudes in the high cycle fatigue range, including endurance limits, from e

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