Abstract
This article presents an analytic model for the prediction of wrinkling occurring in metal/polymer coatings under particular conditions. Owing to different thermal expansion coefficients (TECs) of the substrate and the different coating layers, temperature variation can induce a compressive stress in the coating. The wrinkling is the material response to the instability caused by this compressive stress. In this study, a reference case was selected: a 0.27-mm-thick steel sheet with a 5-μm-thick polymer layer and, on top of it, a thin aluminum film of 50 nm in thickness. For this reference case, it was observed and predicted by the model that an increase in temperature yielded to the wrinkling of the thin aluminum film. The geometry of the multilayer coating and the properties of the constituent materials are factors able to promote or prevent the wrinkle. To better understand and predict their effects, a sensitivity analysis was carried out with the proposed analytic model. A special attention was devoted to the temperature when wrinkling occurs. The key parameters having a significant influence on the wrinkling temperature were identified. It is concluded that the elastic modulus of the thin aluminum film and that of the polymer, the TEC of the thin film, and the initial stress induced during the processing of the multilayer system all had a significant influence on the wrinkling temperature.
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Acknowledgments
The authors thank the Walloon Region (Winnomat2 Dinosaure project). The Belgian Scientific Research Fund F.R.S. - FNRS which finances A.M.H., and the Belgian Sciences Policy (interuniversity attraction poles program IAP P7/21) are thanked for their financial support. The authors would also thank their industrial partner for this Winnomat2 project, namely AC&CS, subsidiary of CRM group (previously AMLR, subsidiary of ArcelorMittal).
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Zhang, L., Habraken, A.M., Ben Bettaieb, A. et al. Parametric Study of Metal/Polymer Multilayer Coatings for Temperature Wrinkling Prediction. J. of Materi Eng and Perform 22, 2437–2445 (2013). https://doi.org/10.1007/s11665-013-0541-z
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DOI: https://doi.org/10.1007/s11665-013-0541-z