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| Home > Publications database > Simulation of the effect of realistic surface textures on thermally induced topcoat stress fields by two-dimensional interface functions |
| Journal Article | FZJ-2014-03289 |
; ;
2014
American Concrete Institute (aci international)
Amsterdam [u.a.]
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Please use a persistent id in citations: doi:10.1016/j.surfcoat.2014.09.032
Abstract: The simulation of thermally induced three-dimensional stress fields in multilayer systems with rough interfacesaccording to the distribution of stress levels by two-dimensional modeling approaches is investigated here byperforming a case study on atmospherically plasma-sprayed thermal barrier coating systems. In order to analyzethe microstructure effect, the pronounced interface roughness of these systems is simulated with different approximationfunctions, whose parameters are derived on the basis of measured surface roughness parameters.Finite element analyses of realistic three-dimensional and multiple two-dimensional models were performedensuring that consistent boundary conditions were established in both cases. These analyses yielded stress distributionsas a function of the thickness of a thermally grown oxide layer. In comparison to the reference histogramfor the stress distribution in the three-dimensional model, the analyses of the two-dimensionalapproximation models result in histograms which correctly reflect essential oxide-growth-related featuressuch as stress field inversion and reduction of maximum stress levels. However, these simplifying twodimensionalmodels do not reflect all the details of the stress distributions. The three-dimensional reference isfound to be too complex with respect to the geometric interface features to be replaced by a single twodimensionalapproximating function.
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