| Titre : |
Achieving class a appearance on fiber-reinforced substrates : Achieving Class A appearance over fiber-reinforced substrates can be challenging. Learn about solutions and the evolving measurements used to characterize topcoated surface appearance |
| Type de document : |
texte imprimé |
| Auteurs : |
Donald H. Campbell, Auteur ; G. Singh, Auteur ; Cindy Peters, Auteur ; Jacob Dumbleton, Auteur |
| Année de publication : |
2021 |
| Article en page(s) : |
p. 32-40 |
| Note générale : |
Bibliogr. |
| Langues : |
Américain (ame) |
| Catégories : |
Automobiles -- Revêtements:Automobiles -- Peinture
Composites à fibres de carbone
Eléments finis, Méthode des
PolyamidesUn polyamide est un polymère contenant des fonctions amides -C(=O)-NH- résultant d'une réaction de polycondensation entre les fonctions acide carboxylique et amine.
Selon la composition de leur chaîne squelettique, les polyamides sont classés en aliphatiques, semi-aromatiques et aromatiques. Selon le type d'unités répétitives, les polyamides peuvent être des homopolymères ou des copolymères.
Revêtements -- Finition:Peinture -- Finition
Surfaces (Physique)
Surfaces courbes
Topographie
|
| Index. décimale : |
667.9 Revêtements et enduits |
| Résumé : |
Achieving Class A appearance over fiber-reinforced substrates can be challenging. We discuss the evolving measurements used to characterize topcoated surface appearance. The influence of carbon fiber on the surface appearance of a thermoplastic resin-transfer-molding (RTM) substrate is related to differences in thermal expansion within the substrate.
The mechanism identified here is then extended to several chopped-fiber-filled thermoplastic substrates where the fiber-mapping effect is manifested in a different manner. We then investigate the influence of thick-film applications to the Class A surface on appearance. Our analysis finds that both the depth and the width or wavelength of the substrate affect the ability of the thick films to cover fiber mapping. |
| Note de contenu : |
- Class a appearance defined and measured
- Mechanism of fiber influence on appearance
- Potential solutions
- Ongoing projects in this area
- Fig. 1 : Constituent Wave Packets from BYK-Gardner Wavescan
- Fig. 2 : Cross section of RTM substrate
- Fig. 3 : Topography of topcoated RTM substrate at 25°C adn 90°C
- Fig. 4 : Topography of uncoated RTM substrate at 25°C and 90°C
- Fig. 5 : RTM plaque : resin-only area CTE
- Fig. 6 : Effect of fiber on topcoated appearance at bake and room temperatures
- Fig. 7a and 7b : Effect of fiber on substrate surface at bake and room temperatures
- Fig. 8 : Wavescan values for varied primer thicknesses
- Fig. 10 : Relationship of primer thickness to defect wavelength ratio to defect coverage
- Fig. 11 : Finite Element Analysis of defect propagation through primer
- Fig. 12a and 12b : Appearance values for topcoat processes on carbon-fiber-filled polyamide and propylene
- Table 1 : Changes of topography with temperature
- Table 2 : Finite Element Analysis of varied primer thickness, wavelength, and poisson's ratio |
| En ligne : |
https://drive.google.com/file/d/16c5zuNUS2yU5gQUhSR_1URCxd_BXHbzq/view?usp=share [...] |
| Format de la ressource électronique : |
Pdf |
| Permalink : |
https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=35988 |
in COATINGS TECH > Vol. 18, N° 6 (06/2021) . - p. 32-40
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