Some Considerations on the Evaluation of Methods for the Estimation of Fatigue Parameters from Monotonic Properties

Methods for the estimation of strain life fatigue parameters from monotonic properties are usually evaluated for a wide range of fatigue lives and materials. Authors propose estimation methods to be evaluated separately for low- and high-cycle fatigue regimes and for more subgroups of materials, with regard to their monotonic properties. To test the hypothesis, three methods (Uniform Material Law, Median Method and Roessle-Fatemi's Hardness Method) were evaluated using a test dataset of 32 differently heat-treated low-alloy 42CrMo4 steels. Results indicate that existing estimation methods should be re-evaluated to determine more precisely their applicability for different materials and fatigue regimes.