A fatigue multi‐site cracks model using coalescence, short and long crack growth laws, for anodized aluminum alloys

Michel Chaussumier 1 M. Shahzad 1 Catherine Mabru 1 Rémy Chieragatti 1 Farhad Rezai-Aria 1
1 ICA - Institut Clément Ader
Abstract : It has been shown that decrease of the fatigue life of aluminium alloys treated with anodization can be explained by the degradation of surface condition due to pickling. In order to predict fatigue life of anodized aluminium alloys, a multi‐site crack growth model is developed by considering the pickling pits sites as initial flaws from which fatigue cracks develop. A map of the pickled surface is built from topography measurement with a contact profilometer. Then the pits are detected and their sizes are defined (depth, length and width). At the beginning of the calculation, a short crack growth law is used for crack having depths less than grain size. Then Paris long crack growth law is used. The coalescence of cracks is considered when their lengths increased by its crack tip plastic zone are large enough to interact with other neighbouring short cracks. The fatigue life is calculated for K‐max achieving 70 % K‐IC.
Keywords : fatigue anodizing long crack pits short crack aluminium alloy
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Conference papers
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Michel Chaussumier, M. Shahzad, Catherine Mabru, Rémy Chieragatti, Farhad Rezai-Aria. A fatigue multi‐site cracks model using coalescence, short and long crack growth laws, for anodized aluminum alloys. 10th International fatigue congress (FATIGUE 2010), Jun 2010, Prague, Czech Republic. pp.995-1004, ⟨10.1016/j.proeng.2010.03.108⟩. ⟨hal-01666704⟩

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