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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)

[article]
inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 70, N° 885 (10/1998) . - p. 141-149

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 mécaniques
Index. 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 stresses
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