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Anticipating paint cracking / Mark E. Nichols in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 74, N° 924 (01/2002)
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Titre : Anticipating paint cracking : The application of fracture mechanics to the study of paint weathering Type de document : texte imprimé Auteurs : Mark E. Nichols, Auteur Année de publication : 2002 Article en page(s) : p. 39-46 Note générale : bibliogr. Langues : Américain (ame) Tags : Essai vieillissement Mécanique rupture Fissuration Feuil Exposition intempérie Dégradation Industrie automobile Vernis Peinture Matériau revêtement Index. décimale : 667.9 Revêtements et enduits Résumé : The relationships between the fracture energy (Gc), film thickness, stress level, and weathering time were investigated for a number of automotive clearcoats. As weathering progressed, most clearcoats embrittled due to the combined effects of photooxidation, hydrolysis, and other degradation mechanisms. This embrittlement was measured and related to the chemical composition changes that take place in the clearcoat during weathering. When the fracture energy dropped below the driving energy for cracking, G, brittle cracking occurred. The driving force for cracking was shown to depend on stress level and film thickness. The importance of fatigue loading was also qualitatively investigated. These techniques were successfully used to anticipate the long-term weathering behavior of automative clearcoats. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5679
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 74, N° 924 (01/2002) . - p. 39-46[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 001233 - Périodique Bibliothèque principale Documentaires Disponible 001232 - Périodique Bibliothèque principale Documentaires Disponible Effect of weathering on the stress distribution and mechanical performance of automotive paint systems / Mark E. Nichols in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 70, N° 885 (10/1998)
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Titre : Effect of weathering on the stress distribution and mechanical performance of automotive paint systems Type de document : texte imprimé Auteurs : Mark E. Nichols, Auteur ; C. A. Darr, Auteur Année de publication : 1998 Article en page(s) : p. 141-149 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Analyse thermomécanique
Automobiles -- Revêtements:Automobiles -- Peinture
Contraintes (mécanique)
Couches minces multicouches
Eléments finis, Méthode des
Revêtement en plastiques -- Effets de l'humidité
Revêtements
Revêtements -- Propriétés mécaniques:Peinture -- Propriétés mécaniquesIndex. décimale : 667.9 Revêtements et enduits Résumé : The sources of stress in complete automotive paint systems have been identified and measured as a function of weathering. In addition to the stresses developed during cure, the main sources of stresses developed during exposure are thermal expansion coefficient mismatch, humidity expansion mismatch, and densification of the clearcoat. Stresses generally increase during weathering due to a slow densification of the clearcoat and increasing water absorption and desorption stresses. Finite element analysis (FEA) was used to compute the stress distribution in full paint systems. Stresses are typically in-plane and highest in the primer and clearcoat. Stresses approaching those required to propagate cracks can be attained in weathered paint systems. The presence of flaws, either cracks or incipient delaminations, will lead to large stress concentrations that can give rise to peeling forces not present in coatings without cracks. Note de contenu : - EXPERIMENTAL : Materials - Accelerated weathering - Dynamic mechanical analysis (DMA) and thermomechanical analysis (TMA) - Density - Humidity stresses - Modeling of stresses in multilayer coatings
- RESULTS : Thermoelastic constants of individual layers - Humidity stresses in single layers - Densification stresses - Multilayer stressesPermalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=18044
in JOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 70, N° 885 (10/1998) . - p. 141-149[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 003554 - Périodique Bibliothèque principale Documentaires Disponible Epoxy thiol photolatent base clearcoats : curing and formulation / Christopher M. Seubert in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 7, N° 5 (09/2010)
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Titre : Epoxy thiol photolatent base clearcoats : curing and formulation Type de document : texte imprimé Auteurs : Christopher M. Seubert, Auteur ; Mark E. Nichols, Auteur Année de publication : 2010 Article en page(s) : p. 615-622 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Epoxydes
Formulation (Génie chimique)
Revêtements -- Séchage sous rayonnement ultraviolet
ThiophèneLe thiophène est un composé organique hétérocyclique aromatique de la classe des métalloles. C'est un liquide limpide incolore ayant une odeur qui rappelle celle du benzène. Le thiophène est souvent trouvé naturellement dans le pétrole à des concentrations de quelques pourcents.
Le thiophène est un des composés utilisés pour dénaturer l'alcool.
La réaction de polymérisation du thiophène conduit au polythiophène.
La chimie du thiophène est essentiellement marquée par son caractère aromatique (4 électrons apportés par les doubles liaisons, deux par le soufre).Index. décimale : 667.9 Revêtements et enduits Résumé : Photolatent base crosslinked epoxy thiol coatings were characterized using transmission FTIR spectroscopy, Raman spectroscopy, UV spectroscopy, and Vickers micro-hardness testing. Curing rate constants were calculated for a series of formulations with varying concentrations of photolatent-DBN, ITX (2-isopropyl thioxanthone), and BP (benzophenone), as well as varying curing times. A design of experiments demonstrated that increased UV dose had the greatest impact on increasing the curing rate of the clearcoat system. BP wt% proved to have little impact on the clearcoat curing rate, while PL-DBN and ITX exhibited minimal improvement above 2.5 wt% and 1 wt%, respectively. Vickers micro-hardness results showed that irradiation dose had no impact on the final physical properties of the clearcoat. However, a 24-h ambient post-cure proved to increase the final hardness of the clearcoat under some conditions. DOI : 10.1007/s11998-010-9248-3 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-010-9248-3.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9915
in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 7, N° 5 (09/2010) . - p. 615-622[article]Réservation
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Code-barres Cote Support Localisation Section Disponibilité 012448 - Périodique Bibliothèque principale Documentaires Disponible A hybrid ray-wave optics model to study the scattering behavior of silver metallic paint systems / Christopher M. Seubert in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 15, N° 3 (05/2018)
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Titre : A hybrid ray-wave optics model to study the scattering behavior of silver metallic paint systems Type de document : texte imprimé Auteurs : Christopher M. Seubert, Auteur ; Mark E. Nichols, Auteur ; C. Kappauf, Auteur ; K. Ellwood, Auteur ; M. Shtein, Auteur ; M. D. Thouless, Auteur Année de publication : 2018 Article en page(s) : p. 471-480 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Automobiles -- Revêtements:Automobiles -- Peinture
Couleur
Lumière -- Diffusion
Mesures optiques
Mesures physiques
Modèles numériques
Ondes
Peinture métallisée
Profilométrie
Simulation, Méthode deIndex. décimale : 667.9 Revêtements et enduits Résumé : The gonioapparent lightness of a metallic paint system depends strongly on the 3D microstructure of the platelet-containing basecoat layer, and on the platelet roughness. Current optical models which are used to simulate the paint’s appearance, however, ignore the multi-scale and multi-dimensional microstructural features, which limits their predictive power. Here, we describe a hybrid, ray-wave optics model for metallic paints. This model incorporates the ray-optics of the 3D platelet microstructure and the wave effects that result from the surface roughness of the platelets. This model is used to link the roughness to the reflection lobes of the aluminum platelets, and to the gonioapparent lightness of the paint system. Predicted lightness values from our model matched, at most viewing angles, measurements from physical paint samples. This model can be used to explore the effect of platelet surface roughness on the lightness of the complete paint system and predict the appearance of paints with different platelet microstructures. Note de contenu : - BACKGROUND : Pigments and paint - Scattering of light from a rough metal surface - Digital modeling of paint systems
- MATERIALS AND METHODS : Paint materials and application - Experimental methods - Simulation methods
- RESULTS : Optical profilometry and simulated BRDF of platelets - Five angle lightness values of ray-trace simulations and physical measurements
- DISCUSSION : FEA simulation compared to He-Torrance - Comparison between simulated lightness values and physical measurementsDOI : 10.1007/s11998-017-0028-1 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-017-0028-1.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=30743
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Code-barres Cote Support Localisation Section Disponibilité 20024 - Périodique Bibliothèque principale Documentaires Disponible Long-term weathering behavior of UV-curable clearcoats : Depth profiling of photooxidation, UVA, and HALS distributions / Christopher M. Seubert in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 2, N° 7 (07/2005)
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Titre : Long-term weathering behavior of UV-curable clearcoats : Depth profiling of photooxidation, UVA, and HALS distributions Type de document : texte imprimé Auteurs : Christopher M. Seubert, Auteur ; A. V. Kucherov, Auteur ; Mark E. Nichols, Auteur Année de publication : 2005 Article en page(s) : p. 529-538 Note générale : Bibliogr. Langues : Américain (ame) Tags : Dégradation photooxydante Clearcoat Propriété chimique Stabilisant Additif Revêtement protecteur Etude expérimentale Spectrométrie FTIR Méthode étude Distribution concentration Profil profondeur Vieillissement thermique accéléré Amine Relation formulation propriété Résistance intempérie Acrylique dérivé copolymère Uréthanne Vernis Matériau revêtement Absorbant UV photochimique produit Index. décimale : 667.9 Revêtements et enduits Résumé : The long-term weathering performance of two UV-curable clearcoat systems was studied using in-plane microtomy in combination with infrared spectroscopy, UV spectroscopy, and ESR spectroscopy. Oxygen transport characteristics were also studied using the half-time method. The photooxidation versus depth profile was highly dependant on the presence of hindered amine light stabilizers (HALS) for both coating systems. Ultraviolet light absorbers (UVA) had little effect on the photooxidation profile. A photooxidation gradient was formed in both clearcoats due to a reduction in oxygen solubility when compared to standard thermoset clearcoats. This gradient was only seen in formulations not containing HALS. DOI : 10.1007/s11998-005-0012-z En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-005-0012-z.pdf Format de la ressource électronique : Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3800
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Code-barres Cote Support Localisation Section Disponibilité 002327 - Périodique Bibliothèque principale Documentaires Disponible Migration of hindered amine light stabilizers in automotive clearcoats / Mark E. Nichols in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 10, N° 3 (05/2013)
PermalinkOn the combined use of UVA, HALS, photooxidation, and fracture energy measurements to anticipate the long-term weathering performance of clearcoat/basecoat automotive paint systems / J. L. Gerlock in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 73, N° 918 (07/2001)
PermalinkScaling behavior in the scratching of automotive clearcoats / Christopher M. Seubert in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 4, N° 1 (03/2007)
PermalinkStatistical modeling of coating lifetimes in disparate environments / Mark E. Nichols in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 12, N° 1 (01/2015)
PermalinkTesting accelerated weathering tests for appropriate weathering chemistry : Ozone filtered xenon arc / J. L. Gerlock in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 75, N° 936 (01/2003)
PermalinkThe effect of weathering and thermal treatment on the scratch recovery characteristics of clearcoats / Christopher M. Seubert in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 7, N° 2 (03/2010)
PermalinkThe evolution of surface texture in automotive coatings / Cindy Peters in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 4 (07/2011)
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