Fatigue strength evaluation of linear flow split profile sections based on hardness distribution

A concept to evaluate the fatigue strength of linear flow split profile’s sections using a local strain approach based on the hardness distribution is presented. For this purpose established correlations between hardness and cyclic material properties are adapted to fit experimental results derived by fatigue tests on smooth, non-homogeneous specimens extracted from such profiles. For validation a numerical fatigue strength evaluation of a four-point-bending fatigue test of linear flow split profiles is presented using an elastic–plastic FE model with the material property distribution derived. The developed approach allows an improved estimation of the fatigue strength of the component analysed.