On scratch testing of pressure-sensitive polymeric coatings / Fredrik Wredenberg in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 7, N° 3 (05/2010)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 7, N° 3 (05/2010) . - p. 279-289 Titre : On scratch testing of pressure-sensitive polymeric coatings Type de document : texte imprimé Auteurs : Fredrik Wredenberg, Auteur ; Per-Lennart Larsson, Auteur Année de publication : 2010 Article en page(s) : p. 279-289 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Essais dynamiques Polymères Résistance à l'abrasion Revêtements:Peinture Index. décimale : 667.9 Revêtements et enduits Résumé : Scratching of polymeric coatings on hard substrates is studied experimentally and numerically from a mechanical point of view. In particular, the behavior of local and global mechanical properties, as well as the delamination behavior, at scratching due to pressure-sensitive effects is of interest. The numerical investigation is performed using the finite element method (FEM) where pressure sensitivity is modeled using the classical Drucker-Prager plasticity model (Drucker, Prager, Q. Appl. Math., 10 157-165 (1952)) while the adhesion of the coating to the substrate is modeled as a cohesive zone where relevant model parameters are determined experimentally using the double cantilever beam test with uneven bending moments (DCB-UBM). Good correlation between experimental and numerical results were achieved and the most important finding concerns the fact that the dependence of pressure sensitivity proved to be different for different mechanical quantities. DOI : 10.1007/s11998-009-9202-4 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-009-9202-4.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9808 [article]

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On the stability of delamination growth at scratching of thin film structures / Fredrik Wredenberg in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 8, N° 6 (11/2011)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 8, N° 6 (11/2011) . - p. 707-717 Titre : On the stability of delamination growth at scratching of thin film structures Type de document : texte imprimé Auteurs : Fredrik Wredenberg, Auteur ; Per-Lennart Larsson, Auteur Année de publication : 2011 Article en page(s) : p. 707-717 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Couches minces -- Stabilité Délaminage Eléments finis, Méthode des Rayures Index. décimale : 667.9 Revêtements et enduits Résumé : Scratching of thin film/substrate structures is studied theoretically and numerically. The results are discussed in connection to delamination initiation and in particular subsequent growth at scratching. The material behavior of the film is described by classical elastoplasticity accounting for large deformations. The deformation of the substrate is neglected indicating that the results are pertinent to soft thin films. The numerical investigation is performed using the finite element method (FEM) and the numerical strategy is discussed in some detail. The results from this study show that delamination growth at thin film scratching is a stable feature with crack arrest occurring at a decreasing load. Note de contenu : - Basic considerations and numerical analysis - Delamination analysis - Results and discussion DOI : 10.1007/s11998-011-9352-z En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-011-9352-z.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=12597 [article]

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On the stress distribution at scratching of thin film structures / Fredrik Wredenberg in JOURNAL OF COATINGS TECHNOLOGY AND RESEARCH, Vol. 7, N° 5 (09/2010)  

[article]  inJOURNAL OF COATINGS TECHNOLOGY AND RESEARCH > Vol. 7, N° 5 (09/2010) . - p. 623-635 Titre : On the stress distribution at scratching of thin film structures Type de document : texte imprimé Auteurs : Fredrik Wredenberg, Auteur ; Per-Lennart Larsson, Auteur Année de publication : 2010 Article en page(s) : p. 623-635 Note générale : Bibliogr. Langues : Américain (ame) Catégories : Rayures Revêtements:Peinture Tags : Revêtement  Rayure  'Structures  film/substrat'  'Distribution  du  stress'  'Analyse  des  éléments  finis'  Délamination Index. décimale : 667.9 Revêtements et enduits Résumé : Scratching of thin film/substrate structures is studied theoretically and numerically. In most cases, the material behavior of the film as well as the substrate is described by classical elastoplasticity accounting for large deformations; further, pressure-sensitive flow models are considered. The main efforts are devoted toward an understanding of the influence from the film/substrate boundary on the stress distribution at scratching but for comparative reasons, scratching of homogeneous materials are also studied and pertinent results presented. Among other things, the results are discussed in relation to delamination initiation and growth at scratching. The numerical investigation is performed using the finite element method, and the numerical strategy is discussed in some detail. The most important finding given by the present study is that high shear stresses are the main driving force for delamination initiation and growth along the film/substrate interface. It was also noted that the influence from pressure-sensitive flow on the stress fields related to delamination initiation is small, both quantitatively and qualitatively. DOI : 10.1007/s11998-010-9242-9 En ligne : https://link.springer.com/content/pdf/10.1007%2Fs11998-010-9242-9.pdf Format de la ressource électronique : Pdf Permalink : https://e-campus.itech.fr/pmb/opac_css/index.php?lvl=notice_display&id=9916 [article]

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