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Effects of three-dimensional coating interfaces on thermo-mechanical stresses within plasma spray thermal barrier coatings

Kyaw, Si; Jones, Arthur; Jepson, Mark A.E.; Hyde, Tom; Thomson, Rachel C.

Authors

Si Kyaw

Arthur Jones

Mark A.E. Jepson

Tom Hyde

Rachel C. Thomson



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.

Citation

Kyaw, S., Jones, A., Jepson, M. A., Hyde, T., & Thomson, R. C. (2017). Effects of three-dimensional coating interfaces on thermo-mechanical stresses within plasma spray thermal barrier coatings. Materials and Design, 125, 189-204. https://doi.org/10.1016/j.matdes.2017.03.067

Journal Article Type Article
Acceptance Date Mar 22, 2017
Online Publication Date Mar 23, 2017
Publication Date Jul 5, 2017
Deposit Date Apr 3, 2017
Publicly Available Date Aug 10, 2018
Journal Materials & Design
Print ISSN 0261-3069
Electronic ISSN 0264-1275
Publisher Elsevier
Peer Reviewed Peer Reviewed
Volume 125
Pages 189-204
DOI https://doi.org/10.1016/j.matdes.2017.03.067
Keywords Thermal barrier coatings; Finite element analysis; Surface profile; Stress analysis; Failure mechanisms
Public URL https://nottingham-repository.worktribe.com/output/851708
Publisher URL https://www.sciencedirect.com/science/article/pii/S0264127517303234
Additional Information This article is maintained by: Elsevier; Article Title: Effects of three-dimensional coating interfaces on thermo-mechanical stresses within plasma spray thermal barrier coatings; Journal Title: Materials & Design; CrossRef DOI link to publisher maintained version: https://doi.org/10.1016/j.matdes.2017.03.067; Content Type: article; Copyright: © 2017 The Authors. Published by Elsevier Ltd.

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