Micromechanics model for the detachment of residually compressed brittle films and coatings

Citation
Ag. Evans et al., Micromechanics model for the detachment of residually compressed brittle films and coatings, ACT MATER, 47(5), 1999, pp. 1513-1522
Citations number
22
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science",Metallurgy
Journal title
ACTA MATERIALIA
ISSN journal
1359-6454 → ACNP
Volume
47
Issue
5
Year of publication
1999
Pages
1513 - 1522
Database
ISI
SICI code
1359-6454(19990331)47:5<1513:MMFTDO>2.0.ZU;2-F
Abstract
The durability of residually compressed coatings, particularly thermal barr ier coatings (TBCs), is governed by events occurring at the interface with the substrate. In general, failure involves the sequential nucleation growt h and coalescence of separations in the presence of imperfections and defec ts. The growth and coalescence phases are analyzed. Remnant ligaments are e xpected from the mechanics. These allow the coating to remain attached to t he substrate, even when interface separation is profuse. Detachment happens when transverse loads develop. Critical values of these loads are calculat ed and their implications discussed. (C) 1999 Acta Metallurgica Inc. Publis hed by Elsevier Science Ltd. All rights reserved.