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

Chaussumier, Michel and Shahzad, Majid and Mabru, Catherine and Chieragatti, Rémy and Rezaï-Aria, Farhad A fatigue multi-site cracks model using coalescence, short and long crack growth laws, for anodized aluminum alloys. (2010) Procedia Engineering, vol. 2 (n° 1). pp. 995-1004. ISSN 1877-7058

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Official URL: http://dx.doi.org/10.1016/j.proeng.2010.03.108

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 Kmax achieving 70 % KIC.

Item Type:Article
Additional Information:Thanks to Elsevier editor. The definitive version is available at http://www.sciencedirect.com The original PDF of the article can be found at Procedia Engineering website: http://www.sciencedirect.com/science/journal/18777058
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution: Université de Toulouse > Ecole des Mines d'Albi-Carmaux - EMAC
Université de Toulouse > Institut National des Sciences Appliquées de Toulouse - INSA
Université de Toulouse > Institut Supérieur de l'Aéronautique et de l'Espace - ISAE
Université de Toulouse > Université Paul Sabatier-Toulouse III - UPS
Laboratory name:
Institut Clément Ader - ICA (Toulouse, France) - Surfaces, Usinage, Matériaux et Outillages - Fatigue, Modélisation, Endommagement et Usure
Département de Mécanique des Structures et Matériaux - DMSM (Toulouse, France)
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Deposited By: Catherine Mabru
Deposited On:19 May 2010 15:39

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