Measurement approaches to develop a fundamental understanding of scratch and mar resistance / Mark R. van Landingham in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 1, N° 4 (10/2004)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 1, N° 4 (10/2004) . - p. 257-266 Titre : Measurement approaches to develop a fundamental understanding of scratch and mar resistance Type de document : texte imprimé Auteurs : Mark R. van Landingham, Auteur ; Li-Piin Sung, Auteur ; Neng-Kai Chang, Auteur ; Tsun Yen Wu, Auteur ; Shuo-Hung Chang, Auteur ; Vincent Jardret, Auteur Année de publication : 2004 Article en page(s) : p. 257-266 Note générale : Bibliogr. Langues : Américain (ame) Tags : Propriété  mécanique  Etude  expérimentale  Viscoélasticité  Modélisation  comparative  Microscopie  confocale  Indentation  Méthode  mesure  Résistance  rayure  Dureté  Méthacrylate  de  méthyle  polymère  Epoxyde  résine Index. décimale : 667.9 Revêtements et enduits Résumé : Instrumented indentation and confocal microscopy were used to characterize the surface mechanical response of polymeric materials. Viscoelastic behavior was measured using instrumented indentation. A model based on the contact between a rigid probe and a viscoelastic material was used to calculate values for the creep compliance and stress relaxation modulus for two polymeric materials, epoxy and poly(methyl methacrylate) or PMMA. Scratch testing was performed on these materials with various probes under a variety of conditions, and confocal microscopy was used to characterize the resulting deformation. Relationships among viscoelastic behavior, scratch damage, and appearance are currently being explored using these methods along with finite element modeling. DOI : 10.1007/s11998-004-0028-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-004-0028-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3857 [article]

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Scratch durability of automotive clear coatings : A quantitative, reliable and robust methodology / Vincent Jardret in JOURNAL OF COATINGS TECHNOLOGY (JCT), Vol. 72, N° 907 (08/2000)

[article]  inJOURNAL OF COATINGS TECHNOLOGY (JCT) > Vol. 72, N° 907 (08/2000) . - p. 79-88 Titre : Scratch durability of automotive clear coatings : A quantitative, reliable and robust methodology Type de document : texte imprimé Auteurs : Vincent Jardret, Auteur ; B. N. Lucas, Auteur ; Warren Oliver, Auteur Année de publication : 2000 Article en page(s) : p. 79-88 Note générale : Bibliogr. Langues : Américain (ame) Tags : Matériau  revêtement  Peinture  Vernis  Industrie  automobile  Propriété  mécanique  Feuil  Dégradation  Résistance  rayure  Durabilité  Méthode  étude Index. décimale : 667.9 Revêtements et enduits Résumé : Scratch and mar durability of clear coatings are issues of concern to the automobile manufacturer and paint supplier. Scratching of clearcoats is a consequence of tribological events encountered by painted exteriors during normal service life. Several subjective methods to assess scratch durability have been proposed. These methods offer little insight into scratch mechanisms. More recently, single scratch methods have been proposed to probe clearcoat scratch mechanisms. This paper outlines a reliable and robust scratch methodology for evaluating scratch durability of automotive clear coatings. It is shown that, with appropriate characterization of tip geometry, quantitative and reproducible critical load values can be obtained. A suggested test method for scratch durability is described. Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5792 [article]

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Understanding the effect of processing conditions on the scratch and mechanical behavior of automotive plastic coatings on TPO / Dottie Britz in COATINGS TECH, Vol. 3, N° 6 (06/2006)  

[article]  inCOATINGS TECH > Vol. 3, N° 6 (06/2006) . - p. 40-46 Titre : Understanding the effect of processing conditions on the scratch and mechanical behavior of automotive plastic coatings on TPO Type de document : texte imprimé Auteurs : Dottie Britz, Auteur ; Rose Ann Ryntz, Auteur ; Vincent Jardret, Auteur ; Phillip V. Yaneff, Auteur Année de publication : 2006 Article en page(s) : p. 40-46 Note générale : Bibliogr. Langues : Américain (ame) Index. décimale : 667.9 Revêtements et enduits Résumé : Scratching of plastic components has been a growing concern among automakers. Scratching may result from pre-delivery or post-delivery events. The coatings chemist may formulate differently for "green" properties, such as those related to pre-delivery, than for those properties resulting from aged, weathered coatings. Unfortunately, manufacturers’ warranties cannot separate out which event is the more prevalent contributor to damage of coatings on plastics. While automotive coating producers measure such properties as tensile strength, modulus, and hardness in attempts to relate these mechanical properties back to the "green" scratch resistance, little has been done to show how mechanical properties change as a function of weathering. This article attempts to correlate the scratch resistance behavior of different one-component (1K) crosslinked systems to the mechanical properties developed as a function of processing conditions and weathering. Of the parameters studied, cure temperature was found to be more critical than time at temperature, thus negating the concept of bake equivalents for coatings on plastics. In addition, it was found that for some 1K cured coatings, scratch resistance did not change significantly with the processing conditions used, while mechanical properties did, especially after accelerated weathering. En ligne : https://drive.google.com/file/d/1-GeIisRWMjVWJBaVfr1KVKmJ2DdLAo0n/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=5485 [article]

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Visco-elastic visco-plastic analysis of scratch resistance of organic coatings / Vincent Jardret in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 2, N° 8 (10/2005)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 2, N° 8 (10/2005) . - p. 591-598 Titre : Visco-elastic visco-plastic analysis of scratch resistance of organic coatings Type de document : texte imprimé Auteurs : Vincent Jardret, Auteur ; Rose Ann Ryntz, Auteur Année de publication : 2005 Article en page(s) : p. 591-598 Note générale : Bibliogr. Langues : Américain (ame) Tags : Propriété  rhéologique  Aminoplaste  Etude  expérimentale  Elastoplasticité  Viscoélasticité  Modélisation  comparative  Relation  contrainte  déformation  Indentation  Méthode  mesure  Thermodurcissable  Oléfine  polymère  mécanique  Mélamine  résine  Dureté  traction  Ester  Caoutchouc  thermoplastique  Acrylique  dérivé  Endommagement  Peinture  haute  teneur  solide  Matériau  revêtement  Résistance  rayure Index. décimale : 667.9 Revêtements et enduits Résumé : The sensitivity of automotive coatings to scratching, particularly coatings for plastics, has been a growing conceal among automakers. Scratching may result from such predelivery events as polishing minor defects embeddedin the paint, or postdelivery events such as car wash bristles, dirt embedded under a cloth utilized in polishing the car, tree branches, and the like. Warranty cannot separate out which event is the more prevalent (e.g., predelivery or postdelivery to the customer) form of damage on plastics. Data available on coatings for metal, however, does suggest that isocyanate-based crosslinked systems perform more poorly than their melamine-based crosslinked counterparts when exposed to in plant (predelivery) handling. Coatings on plastics, while lower in modulus than coatings on steel, are still subject to scratch events, albeit they have a greater tendency to "self-heal" once scratching events have occurred. This work attempts to correlate the scratch resistance behavior of three different one-component hydroxyl-functional acrylic or polyester-acrylic-melamine-crosslinked systems. Relationships between the tensile and indentation properties of the coatings were found to be related to the initial warranty data of the coating systems. Most importantly, it was apparent that the critical depth to fracture of the flexible coatings may be the relevant indicator of field performance for coatings on plastics. For metals, the relevant indicator to field performance is often only critical load to fracture, negating the influence of indentation depth. This variance is important to consider since coatings on plastic are often softer and more resilient to surface abrasions than their counterparts on metal. DOI : 10.1007/BF02774588 En ligne : https://link.springer.com/content/pdf/10.1007%2FBF02774588.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=3784 [article]

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