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Theses

Modélisation de la rugosité et de l'aspect de surfaces d'acier peintes

Abstract : The visual appearance of the painted steel sheets constituting the body of a car contributes significantly to the quality of the entire vehicle. If the industrial processes of paint deposition has a major impact on the visual appearance of the painted steel sheets, the intrinsic quality of the steel sheet used remains a key factor in its obtention. In this thesis, the influence of the topography of rough steel sheets on the appearance after painting is investigated. The deposition of the successive layers of electrophoresis, sealer and lacquer on the metal significantly modify the surface roughness. Hydrodynamic models were developed during this thesis project, which aim at predicting the final topography of the painted sheet. Emphasis is placed on the influence of the paint rheology, Newtonian or non-Newtonian, on the leveling. A major challenge regarding the study of the painting is the measurement of its rheological parameters in the geometric configuration of thin films. A method is presented which, by resolving an inverse problem, allows an in situ characterization of the rheology of the paint. An important experimental work and the development of tools for characterizing surface roughness based on the wavelet transform validated the use of the different models to describe the various stages of the process of painting. The interaction of light with the painted surfaces is finally briefly investigated. A model which takes into account the influence of the roughness and the phenomenon of light scattering in the paint layer is presented. Simulations were made from this model and confronted to experimental results, showing promising results.
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Submitted on : Friday, February 17, 2012 - 2:25:31 PM
Last modification on : Friday, October 23, 2020 - 4:52:06 PM
Long-term archiving on: : Friday, May 18, 2012 - 2:35:49 AM

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  • HAL Id : pastel-00671439, version 1

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Bruno Figliuzzi. Modélisation de la rugosité et de l'aspect de surfaces d'acier peintes. Matériaux. École Nationale Supérieure des Mines de Paris, 2011. Français. ⟨NNT : 2011ENMP0060⟩. ⟨pastel-00671439⟩

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