Comparison of different one-parameter damage laws and local stress-strain approaches in multiaxial fatigue life assessment of notched components

This paper aims to compare the predictive capabilities of different one-parameter damage laws and local stressstrain approaches to assess the fatigue lifetime in notched components subjected to proportional bending-torsion loading. The tested fatigue damage parameters are defined using well-known stress-based, strain-based, SWTbased and energy-based relationships. Multiaxial cyclic plasticity at the notch-controlled process zone is accounted for within a 3D-FE linear-elastic framework using three local stress-strain approaches, namely Neuber's rule, equivalent strain energy density rule (ESED) and the modified ESED rule. Regarding the local stressstrain approaches, irrespective of the fatigue damage parameter, Neuber's rule always led to more conservative results, and the modified ESED rule resulted in slightly better fatigue life predictions when compared to the original ESED rule. As far as the fatigue damage parameters are concerned, energy-based models were more accurate, irrespective of the local stress-strain approach.

Automated summary

This paper compares the predictive capabilities of different one-parameter damage laws and local stress-strain approaches in assessing fatigue lifetime, finding that energy-based models are more accurate and Neuber's rule tends to be conservative in results.