Modelling the high temperature behaviour of TBCs using sequentially coupled microstructural–mechanical FE analyses

Thermal barrier coatings provide a means of thermal insulation of gas turbine components exposed to elevated temperatures. They undergo severe microstructural changes and material degradation, which have been implemented in this work by means of a sequentially coupled microstructural mechanical calc...

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Bibliographic Details
Published in:Materials science & engineering. A, Structural materials : properties, microstructure and processing Structural materials : properties, microstructure and processing, 2009-07, Vol.513, p.302-310
Main Authors: Hermosilla, U., Karunaratne, M.S.A., Jones, I.A., Hyde, T.H., Thomson, R.C.
Format: Article
Language:English
Subjects:
Applied sciences
Creep
Eshelby
Exact sciences and technology
Finite element analysis
Fractures
Mechanical properties and methods of testing. Rheology. Fracture mechanics. Tribology
Metals. Metallurgy
Oxidation
Stress accumulation
Thermal barrier coating
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Summary:Thermal barrier coatings provide a means of thermal insulation of gas turbine components exposed to elevated temperatures. They undergo severe microstructural changes and material degradation, which have been implemented in this work by means of a sequentially coupled microstructural mechanical calculation that made use of a self-consistent constitutive model within finite element calculations. Analyses for different temperatures and bond coat compositions were run, which reproduced the trends reported in previous research and identified the accumulation of high out-of-plane tensile stresses within the alumina layer as an additional phenomenon that could drive high temperature crack nucleation.
ISSN:0921-5093
1873-4936
DOI:10.1016/j.msea.2009.02.006