Predicting fretting-fatigue endurance of rotating bending shrink-fitted assemblies using a sequential RUIZ-SWT approach: The effect of entrapped debris layer

Fretting-fatigue damage often appears in shaft shrink-fitted assemblies submitted to rotating bending. This paper focuses on the influence of the sleeve edge geometry on such damage. Rotating bending tests have been per-formed and broken and unbroken specimens have been expertized confirming fretting-fatigue phenomena. A 3D finite element method model was developed to evaluate the sliding and opening lengths. A sequential tribo-logical -fatigue stress analysis strategy allowed the prediction of the maximum crack location ( Ruiz criterion) then the estimation of the fatigue endurance of the assembly using the SWT criterion. The last step of this sSWT(X-Gmax) approach considers the presence of a debris layer within the contact to improve the consistency of the service life prediction.

Automated summary

This paper investigates the influence of sleeve edge geometry on fretting-fatigue damage in shaft shrink-fitted assemblies under rotating bending. Experimental tests and analysis of broken and unbroken specimens confirm the presence of fretting-fatigue phenomena. A 3D finite element model is developed to evaluate sliding and opening lengths. A sequential tribological-fatigue stress analysis strategy is employed to predict the maximum crack location (Ruiz criterion) and estimate the fatigue endurance of the assembly using the SWT criterion. The presence of a debris layer within the contact is considered in the last step of the sSWT(X-Gmax) approach to improve the consistency of service life prediction.