Evaluation of scratch and mar resistance in automotive coatings / B. Pourdeyhimi in EUROPEAN COATINGS JOURNAL (ECJ), N° 3/99 (03/1999)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 3/99 (03/1999) . - p. 72-79 Titre : Evaluation of scratch and mar resistance in automotive coatings Type de document : texte imprimé Auteurs : B. Pourdeyhimi, Auteur ; Xuegin Wang, Auteur ; Fred Lee, Auteur Année de publication : 1999 Article en page(s) : p. 72-79 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Currently available techniques are often deficient in accurate characterization of scratch and mar resistance of automotive coatings and the concomitant changes in appearance. Scratch and mar resistance is related to the ability of a coating in resisting deformation. The appearance change may be due to unsightly scratches or to surface roughening which causes a reduction in gloss and reflectivity. This paper focuses on the measurement of the ability of a coating in resisting scratching by a nanoscratching technique. En ligne : https://drive.google.com/file/d/1pQjvRZwct9lfPWyP2gpb9zg1nY9hhBV5/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11165 [article]

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Making scratch resistance visible / B. Pourdeyhimi in EUROPEAN COATINGS JOURNAL (ECJ), N° 4/99 (04/1999)  

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 4/99 (04/1999) . - p. 100-106 Titre : Making scratch resistance visible Type de document : texte imprimé Auteurs : B. Pourdeyhimi, Auteur ; Xuegin Wang, Auteur ; Fred Lee, Auteur Année de publication : 1999 Article en page(s) : p. 100-106 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : Scratches and other mechanical damages of the coatings surface lead to changes in appearance like reduction in gloss and reflectivity. Yet no techniques for accurate characterization of these changes are yet available. The optical imaging technique described below for examining surface defects provides a main advantage : it is completely insensitive to the basecoat and its properties will not in any form influence the reflectivity of the topcoat. Note de contenu : - Superior to human perception - To eliminate influence by the basecoat - A three-dimensional optical arrangement - Defective areas cause scattering - Experimental conditions - A modified mar test is developed - Dry abrasion test - Two series of experiments to examine the extent of damage - Image analysis methods - Different opinions to the reflectance of apperance change - Standard errors of statistics are not relevant - Texture roughness can be characterized using power spectral density - Some mathematic details to PSD - Greatest loss of reflectivity by polyurethane samples - Fibers in the pad material caused curied path at low loads - A perfect correlation between the gloss measurement and reflectivity - Texture roughness is a robust measure of appearance at early stages of wear En ligne : https://drive.google.com/file/d/1m6XikT29zaJUEfsc64MAIeaPlsXTMFi9/view?usp=drive [...] Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=11178 [article]

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Scribe corrosion characterized by distance transform / B. Pourdeyhimi in EUROPEAN COATINGS JOURNAL (ECJ), N° 4/00 (04/2000)

[article]  inEUROPEAN COATINGS JOURNAL (ECJ) > N° 4/00 (04/2000) . - p. 34-42 Titre : Scribe corrosion characterized by distance transform Type de document : texte imprimé Auteurs : B. Pourdeyhimi, Auteur ; Fred Lee, Auteur ; Han Seong Kim, Auteur Année de publication : 2000 Article en page(s) : p. 34-42 Note générale : Bibliogr. Langues : Anglais (eng) Index. décimale : 667.9 Revêtements et enduits Résumé : This paper reports on the application of the image analysis methods to characterize scribe corrosion in coatings by the use of a distance transform. The methods developed are discussed with respect to the image processing steps required as well as those used for the subsequent analysis of the processed images. The results indicate that the distance transform can be used successfully to characterize scribe corrosion. Note de contenu : - To create a distance map - Segmentation is an essential tool in the field of image analysis - Iterative relaxation segmentation - Thresholding - Distance transform by scanning the image twice - The experiment Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=10989 [article]

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