2013

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Benchmark creep tests for thermal barrier coatings
(НТУ "ХПІ", 2013) Zolochevsky, A.; Sklepus, S.; Parkhomenko, L.; Gnitko, V.; Kühhorn, A.; Kober, M.; Leyens, C.
The topic of this paper involves a number of benchmark creep tests and reference solutions that give the possibility to verify the finite element analysis of stress redistribution in thermal barrier coatings related to commercial software packages. The numerical results have been compared in the benchmark tests with the results obtained by other methods and by other authors. The results of creep studies revealed the magnitudes of the local stresses that correlate with the residual stresses determined in the thermally grown oxide by the luminescence spectroscopy method. The creep properties of Ni-based superalloy substrate have strong influence on the stress state and subsequent failure of EB-PVD thermal barrier coatings. The obtained numerical results demonstrate that the future EB-PVD thermal barrier coatings should be developed simultaneously with the Ni-based superalloy substrate, because the effectiveness of coating is influenced by the composition and properties of the substrate.