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Estimation of interfacial fracture toughness based on progressive edge delamination of a thin transparent coating on a polymer substrate / S. Tarasovs in Acta materialia, Vol. 58 N° 8 (Mai 2010) 

Public ISBD [article]  in Acta materialia > Vol. 58 N° 8 (Mai 2010) . - pp. 2948–2956 Titre : Estimation of interfacial fracture toughness based on progressive edge delamination of a thin transparent coating on a polymer substrate Type de document : texte imprimé Auteurs : S. Tarasovs, Auteur ; J. Andersons, Auteur ; Y. Leterrier, Auteur Année de publication : 2011 Article en page(s) : pp. 2948–2956 Note générale : Métallurgie Langues : Anglais (eng) Mots-clés : Coatings  Adhesion  Tension  test  Toughness  Finite  element  analysis Résumé : Evaluation of interfacial toughness of sub-micron-thickness layers deposited on a ductile substrate is a challenging task which has motivated different experimental approaches. Fragmentation testing was used in the present study as a means of interface characterization of a silicon–nitride-coated polyimide substrate. During the test, after an initial rapid segmentation–cracking phase, the coating fragments developed edge delaminations which propagated in a stable manner with further increase in the applied strain. The debonding process was modelled by the finite element method incorporating a cohesive zone at the front of the interfacial crack. The edge cracks were found to be dominated by mode II loading. By fitting the predicted delamination evolution to the experimental data for coating fragments of differing geometry, the mode II critical energy release rate was estimated at 30 J m−2. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410000376 [article] Estimation of interfacial fracture toughness based on progressive edge delamination of a thin transparent coating on a polymer substrate [texte imprimé] / S. Tarasovs, Auteur ; J. Andersons, Auteur ; Y. Leterrier, Auteur . - 2011 . - pp. 2948–2956. Métallurgie Langues : Anglais (eng) in Acta materialia > Vol. 58 N° 8 (Mai 2010) . - pp. 2948–2956 Mots-clés : Coatings  Adhesion  Tension  test  Toughness  Finite  element  analysis Résumé : Evaluation of interfacial toughness of sub-micron-thickness layers deposited on a ductile substrate is a challenging task which has motivated different experimental approaches. Fragmentation testing was used in the present study as a means of interface characterization of a silicon–nitride-coated polyimide substrate. During the test, after an initial rapid segmentation–cracking phase, the coating fragments developed edge delaminations which propagated in a stable manner with further increase in the applied strain. The debonding process was modelled by the finite element method incorporating a cohesive zone at the front of the interfacial crack. The edge cracks were found to be dominated by mode II loading. By fitting the predicted delamination evolution to the experimental data for coating fragments of differing geometry, the mode II critical energy release rate was estimated at 30 J m−2. DEWEY : 669 ISSN : 1359-6454 En ligne : http://www.sciencedirect.com/science/article/pii/S1359645410000376