Effects of Interface Roughness on Residual Stresses in Thermal Barrier Coatings

Using a newly developed object‐oriented finite‐element analysis method, both an actual microstructure and model microstructures of a plasma‐sprayed thermal barrier coating system were numerically simulated to analyze the full‐field residual stresses of this coating system. Residual stresses in the a...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 1999-04, Vol.82 (4), p.1073-1075
Main Authors: Hsueh, Chun-Hway, Haynes, James A., Lance, Michael J., Becher, Paul F., Ferber, Mattison K., Fuller, Edwin R., Langer, Stephen A., Carter, W. Craig, Cannon, W. Roger
Format: Article
Language:English
Subjects:
Applied sciences
Building materials. Ceramics. Glasses
Ceramic industries
Ceramics
Chemical industry and chemicals
Exact sciences and technology
Interface roughness
Miscellaneous
Residual stress
Technical ceramics
Thermal barrier coatings
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Summary:Using a newly developed object‐oriented finite‐element analysis method, both an actual microstructure and model microstructures of a plasma‐sprayed thermal barrier coating system were numerically simulated to analyze the full‐field residual stresses of this coating system. Residual stresses in the actual microstructure were influenced by both the irregular top‐coat/bond‐coat interface and cracks in the top coat. By treating the microcracked top coat as a more‐compliant solid microstructure, the effects of the irregular interface on residual stresses were examined. These results then could be compared to results that have been obtained by analyzing a model microstructure with a sinusoidal interface, which has been considered by some earlier investigators.
ISSN:0002-7820
1551-2916
DOI:10.1111/j.1151-2916.1999.tb01878.x