Publication de 6 numéros par an
ISSN Imprimer: 1543-1649
ISSN En ligne: 1940-4352
Indexed in
A Parametric Domain Map for Top Coat Damage Initiation and Propagation in EB-PVD Thermal Barrier Coatings
RÉSUMÉ
Despite providing superior protection of engine components from severe temperatures, thermal barrier coatings are susceptible to catastrophic failure due to large-scale interfacial delamination. Under operating conditions, interfacial waviness increases due to bond coat creep and the cyclic nature of the thermal loading. Recent analyses show that the top coat incurs cracks at the sites of interfacial undulation. The top coat cracks propagate and coalesce under cyclic thermal load, which leads to catastrophic interfacial delamination. In this article, a finite element model of the thermal barrier coating (TBC) system is developed in the commercial code ABAQUS to investigate dependencies on various parameters and to develop a simplified parametric understanding of the top coat crack initiation and propagation. A parametric domain map for assessing crack initiation and propagation is developed in terms of geometric parameters of the TBC. Thus the domain map identifies which TBC geometries yield a fail-safe
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Bhatnagar Himanshu, Ghosh Somnath, Walter Mark E., A parametric study of damage initiation and propagation in EB-PVD thermal barrier coatings, Mechanics of Materials, 42, 1, 2010. Crossref
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Ghosh S., Jain J. R., A homogenisation-based continuum damage mechanics model for cyclic damage in 3D composites, The Aeronautical Journal, 113, 1144, 2009. Crossref