Abstract
In this work different strategies to estimate crack path for cylindrical contacts under fretting conditions are carried out. The main goal is to propose and to evaluate methodologies not only to estimate the direction of crack initiation but also the subsequent propagation in its earlier stages, where the stress field is multiaxial, non-proportional and decays very fast due to the proximity with the contact interface. Such complex conditions pose a substantial challenge to the modelling of crack path. The numerical simulations are provided by a 2D Finite Element Analysis taking into account interactions between the crack faces. The results show that, under fretting conditions, models based on the critical plane method are not effective to estimate the crack initiation orientation, while models based on a so called “critical direction” applied along a critical distance provide better results. Regarding the subsequent crack propagation orientation, it was possible to see that stress intensity factor based models where one considers an infinitesimal virtual crack emerging from an original preexistent crack are powerful mechanisms of crack orientation estimation
Highlights
Fretting is the phenomenon that occur in mechanical couplings subjected to contact loads and small relative tangential displacement due to oscillatory loads
The results show that, under fretting conditions, models based on the critical plane method are not effective to estimate the crack initiation orientation, while models based on a so called “critical direction” applied along a critical distance provide better results
S ome methodologies to predict the direction of crack initiation and further propagation under fretting conditions were assessed, where available experimental data were used to evaluate the accuracy of the methodologies
Summary
Fretting is the phenomenon that occur in mechanical couplings subjected to contact loads and small relative tangential displacement due to oscillatory loads. The fretting problem is characterized by a strong stress concentration in association with wear, which invariably leads to the nucleation of small cracks. In order to conduct such analysis criteria able to precise the location, direction of initiation and the further crack path are essential. In these aspects many challenges must be faced, since the fretting problem is characterized for high levels of multiaxility and non-proportionality The aim of this work is to estimate the crack path under fretting conditions in cylindrical contacts assessing some already used methodologies and propose a new methodology to estimate the direction of crack propagation in their earlier stages. Experimental data from literature will be used to confront the theory
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