Stress gradient effect on the crack nucleation process of a Ti-6Al-4V titanium alloy under fretting loading: comparison between non-local fatigue approaches - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue International Journal of Fatigue Année : 2013

Stress gradient effect on the crack nucleation process of a Ti-6Al-4V titanium alloy under fretting loading: comparison between non-local fatigue approaches

Résumé

This study focuses on the stress gradient effect regarding the crack nucleation of a cylinder/plane Ti-6Al-4V titanium alloy contact under low cycle fatigue (LCF) fretting loading. Several local and non-local analytical approaches were compared to predict experimental results. The first part of the study presents fretting nucleation boundaries for three different cylinder radii in the partial slip regime. In the next part, the Crossland and Papadopoulos multi-axial fatigue criteria are computed and compared. Finally, local and nonlocal fatigue approaches are compared. Square constant volume, critical distance and weighted function approaches have been compared. The methodology used covers a large range of stress gradients. The impact of varying the stress gradients is that the larger the stress gradient, the larger the difference between experiments and local stress fatigue predictions. A Crossland local form was applied to confirm that a local stress fatigue analysis cannot predict the fretting cracking risk. Three nonlocal approaches were carried out, and the results allowed the proper prediction of the empirical thresholds with a 3% to 5% margin of error. The positive results obtained helped select a multi-axial fatigue criterion and a non-local approach which take into account the gradient effect of contact fretting behavior.
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Dates et versions

hal-04229292 , version 1 (05-10-2023)

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Romain Ferré, Siegfried Fouvry, Bruno Berthel, J.-A. Ruiz-Sabariego. Stress gradient effect on the crack nucleation process of a Ti-6Al-4V titanium alloy under fretting loading: comparison between non-local fatigue approaches. International Journal of Fatigue, 2013, 54, pp.56-67. ⟨10.1016/j.ijfatigue.2013.03.005⟩. ⟨hal-04229292⟩
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