Abstract
The local strain approach has been successfully applied in evaluating the fatigue life of notched components under multiaxial loading. In the present work, this approach is combined with the critical plane method. First, it is shown that by considering non-proportional strain hardening in the estimation of local stresses and strains, the accuracy of the results under non-proportional loading can be improved regardless of the applied multiaxiality hypothesis. Three different critical plane hypotheses, SWT (Smith Watson Topper, based on normal strain), FS (Fatemi Socie, based on shear strain) and a short-crack model are used to calculate the fatigue life of notched specimens and compare it to results from an extensive database of test results. The accuracy of the SWT approach is highly dependent on the loading situation. For tests under non-proportional and pure torsional loading, excessively long fatigue lives are predicted. A simple proposal is made for the FS approach to be applied in critical planes with multiple shear strain components. The FS and short-crack approaches predict fatigue lives with high accuracy regardless of the applied load.
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