The use of multiaxial fatigue models to predict fretting fatigue life of components subjected to different contact stress fields

Abstract

A B S T R A C T This work describes the application of multiaxial fatigue criteria based on critical plane and mesoscopic (Dang Van, 1973, Sciences et Techniques de lÁrmement, 47, 647-722) approaches to predict the fatigue initiation life of fretted components. To validate the analysis, several tests under closely controlled laboratory conditions are carried out in a Ti6Al-4V alloy. These classical Hertzian tests reveal a size effect where fretting fatigue lives vary with contact size. Experimentally available data for fretting fatigue of an Al-4Cu alloy are also used to assess the models. Neither the critical plane models nor the mesoscopic criterion considered can account for the effects of different contact stress fields on the initiation life, if the calculation is based only on highly stressed points on the surface. It is shown, however, that satisfactory results can be achieved if high values of the fatigue parameters are sustained over a critical volume.

Fretting fatigue – Experimental and numerical approaches

“…A size effect was also reported by Araújo et al [6]. Vingsbo and Söderberg showed in [4] that the relation between slip amplitudes and fatigue life is not monotonic.…”

Multiaxial effects on LCF behaviour and fatigue failure of AZ31B magnesium extrusion

“…Critical plane models became popular in recent years because of their success in predicting fatigue life for various engineering materials and under different loading conditions. Models such as Fatemi-Socie [31], Smith-Watson-Topper [28,29] and Jiang [27] have been used to analyse various multiaxial loading paths, different materials on both specimen's and component's levels [25,26,32,[45][46][47][48][49][50]. However, there are studies indicating that the predictions of cracking orientations may not necessarily be in agreement with the critical plane predicted by the models even though fatigue predictions are considered reasonable, generally between ±2Â scatter bands.…”

Scaling of maximum net force output by motors used for locomotion

“…) is emerging as an important parameter in fatigue life studies in both biology (Chaudhry et al, 1997;Tardy et al, 1997;Mulholland et al, 1999) and engineering (Fouvry et al, 1998;Araujo et al, 2004). Notably, for multiaxial fatigue life, the familiar engineering parameter of stress is not an appropriate concept, although engineers typically use an adjustment such as the von Mises method to calculate a uniaxial stress that would create the same distortion energy as the actual combination of applied stresses on multiple axes.…”