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Please use this identifier to cite or link to this item: https://dspace.lboro.ac.uk/2134/24677

Title: Effects of three-dimensional coating interfaces on thermo-mechanical stresses within plasma spray thermal barrier coatings
Authors: Kyaw, Si
Jones, Arthur
Jepson, Mark A.E.
Hyde, Tom H.
Thomson, Rachel C.
Keywords: Thermal barrier coatings
Finite element analysis
Surface profile
Stress analysis
Failure mechanisms
Issue Date: 2017
Publisher: Elsevier © The Authors
Citation: KYAW, S. ... et al, 2017. Effects of three-dimensional coating interfaces on thermo-mechanical stresses within plasma spray thermal barrier coatings. Materials & Design, 125, pp.189-204.
Abstract: It has been acknowledged that stresses within a thermal barrier coating (TBC) and its durability are significantly affected by the coating interfaces. This paper presents a finite element approach for stress analysis of the plasma sprayed TBC system, using three-dimensional (3D) coating interfaces. 3D co-ordinates of the coating surfaces were measured through 3D reconstruction of scanning electron microscope (SEM) images. These co-ordinates were post processed to reconstruct finite element models for use in stress analyses. A surface profile unit cell approach with appropriate boundary conditions was applied to reduce the problem size and hence computation time. It has been shown that for an identical aspect ratio of the coating interface, interfacial out-of-plane stresses for 3D models are around twice the values predicted using 2D models. Based on predicted stress development within the systems, possible crack development and failure mechanisms of the TBC systems can be predicted.
Description: This is an Open Access Article. It is published by Elsevier under the Creative Commons Attribution 4.0 International Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/4.0/. The accepted version of the paper will be replaced by the published version once this is available.
Sponsor: We would like to acknowledge the support of The Energy Programme, which is a Research Councils UK cross council initiative led by EPSRC and contributed to by ESRC, NERC, BBSRC and STFC, and specifically the Supergen initiative (Grants GR/S86334/01 and EP/F029748) and the following companies; Alstom Power Ltd., Doosan Power, E.ON, National Physical Laboratory, Praxair Surface Technologies Ltd., QinetiQ, Rolls-Royce plc, RWE npower, Siemens Industrial Turbomachinery Ltd. and Tata Steel, for their valuable contributions to the project.
Version: Published version
DOI: 10.1016/j.matdes.2017.03.067
URI: https://dspace.lboro.ac.uk/2134/24677
Publisher Link: http://doi.org/10.1016/j.matdes.2017.03.067
ISSN: 0261-3069
Appears in Collections:Published Articles (Materials)

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