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The role of the residual stresses of the epoxy-aluminum interphase on the interfacial fracture toughness

Roche, Alain André and Aufray, Maëlenn and Bouchet, Jérôme The role of the residual stresses of the epoxy-aluminum interphase on the interfacial fracture toughness. (2006) The Journal of Adhesion, vol. 82 (n° 9). pp. 867-886. ISSN 0021-8464

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Official URL: http://dx.doi.org/10.1080/00218460600875771

Abstract

When an epoxy-diamine system (DGEBA-IPDA) is applied onto aluminum alloy (5754) and cured, an interphase having chemical, physical, and mechanical properties quite different from those of the bulk polymer is created between the substrate and the part of the polymer having bulk properties. To get a better understanding of the role of the interphase on the interfacial fracture toughness either a tri-layer (bulk coating=interphase=substrate) or a bi-layer model (bulk coating=substrate) were used for quantitative determination of the critical strain energy release rate (noted Gc). Indeed, as the interphase formation results from both dissolution and diffusion phenomena, we were able to control the interphase formation within coated systems by controlling the liquid-solid contact time and then to make tri- or bi-layered systems. The particularity of models used is to consider residual stress profiles developed within the entire system leading to an intrinsic parameter representing the work of adhesion between the polymer and the metallic substrate. The aim of this publication is to clearly establish the role of the interphase mechanical properties, such as Young's modulus and residual stress on the interfacial fracture toughness. Results are presented and discussed for three different aluminum surface treatments (chemical etching, degreasing and anodizing).

Item Type:Article
Additional Information:Thanks to Taylor & Francis editor. The definitive version is available at http://www.tandfonline.com The original PDF can be found at The Journal of Adhesion website: http://www.tandfonline.com/doi/abs/10.1080/00218460600875771#.UkU4_obJSIg
HAL Id:hal-00866781
Audience (journal):International peer-reviewed journal
Uncontrolled Keywords:
Institution:French research institutions > Centre National de la Recherche Scientifique - CNRS (FRANCE)
Other partners > Ecole Polytechnique Fédérale de Lausanne - EPFL (SWITZERLAND)
Université de Toulouse > Institut National Polytechnique de Toulouse - INPT (FRANCE)
Other partners > Institut National des Sciences Appliquées de Lyon - INSA (FRANCE)
Université de Toulouse > Université Toulouse III - Paul Sabatier - UPS (FRANCE)
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Deposited By: Maelenn AUFRAY
Deposited On:27 Sep 2013 08:21

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