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

Kyaw, Si and Jones, Arthur and Jepson, Mark A.E. and Hyde, Tom and Thomson, Rachel C. (2017) Effects of three-dimensional coating interfaces on thermo-mechanical stresses within plasma spray thermal barrier coatings. Materials & Design . ISSN 0264-1275 (In Press)

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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.

Item Type: Article
Keywords: Thermal barrier coatings; Finite element analysis; Surface profile; Stress analysis; Failure mechanisms
Schools/Departments: University of Nottingham, UK > Faculty of Engineering > Department of Mechanical, Materials and Manufacturing Engineering
Identification Number: 10.1016/j.matdes.2017.03.067
Depositing User: Eprints, Support
Date Deposited: 03 Apr 2017 08:31
Last Modified: 13 Oct 2017 01:13
URI: http://eprints.nottingham.ac.uk/id/eprint/41687

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