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Flaking of black anodic films in space environment: Ageing and numerical simulation

Goueffon, Yann and Aldebert, Grégory and Mabru, Catherine and Arurault, Laurent and Tonon, Claire and Guigue, Pascale Flaking of black anodic films in space environment: Ageing and numerical simulation. (2012) Mechanics of Materials, vol. 45 . pp. 72-82. ISSN 0167-6636

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Official URL: http://dx.doi.org/10.1016/j.mechmat.2011.11.001

Abstract

Black coatings can be used for managing passive thermal control on spacecraft and for avoiding stray light in optical equipment. Inorganic black anodizing of aluminium alloys is a solution to obtain films with a low outgassing and a sufficient thermal stability for this kind of application. Flaking of these coatings has sometimes been observed after thermal cycling on 2XXX and 7XXX aluminium alloys. This phenomenon could generate particulate contamination on satellites optics and may affect mission lifetime. In this work, the influence of thermal cycling on the adhesion of the films was investigated thanks to both a qualitative method (peel-test) and a quantitative method (scratch-test). It has been shown that differential dilatations and dehydration of the film result in stresses inside the film. A finite element model was developed to identify the mechanisms of crack propagation and bifurcation inside the film and thus explain the reasons of flaking. Especially, it has been show that cracks can bifurcate and propagate in the film along the interface under thermal solicitation resulting in a mixed opening / shearing mode loading at the crack tip.

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 Mechanics of Materials website: http://www.sciencedirect.com/science/journal/01676636
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National des Etudes Spatiales - CNES
French research institutions > Centre National de la Recherche Scientifique - CNRS
Other partners > EADS - Astrium (FRANCE)
Université de Toulouse > Ecole des Mines d'Albi-Carmaux - EMAC
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT
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
Centre Interuniversitaire de Recherche et d'Ingénierie des Matériaux - CIRIMAT (Toulouse, France) - Composante LCMIE
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Deposited By: Catherine Mabru
Deposited On:08 Dec 2011 15:53

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