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Simulation of failure of air plasma sprayed thermal barrier coating due to interfacial and bulk cracks using surface-based cohesive interaction and extended finite element method

Kyaw, S.T.; Jones, I.A.; Hyde, T.H.

Simulation of failure of air plasma sprayed thermal barrier coating due to interfacial and bulk cracks using surface-based cohesive interaction and extended finite element method Thumbnail


Authors

S.T. Kyaw

I.A. Jones

T.H. Hyde



Abstract

The present paper describes a method of predicting the failure of a thermal barrier coating system due to interfacial cracks and cracks within bulk coatings. The interfacial crack is modelled by applying cohesive interfaces where the thermally grown oxide is bonded to the ceramic thermal barrier coating. Initiation and propagation of arbitrary cracks within coatings are modelled using the extended finite element method. Two sets of parametric studies were carried out, concentrating on the effect of thickness of the oxide layer and that of initial cracks within the ceramic coating on the growth of coating cracks and the subsequent failures. These studies have shown that a thicker oxide layer creates higher tensile residual stresses during cooling from high temperature, leading to longer coating cracks. Initial cracks parallel to the oxide interface accelerate coating spallation and simulation of this process is presented in this paper. By contrast, segmented cracks prevent growth of parallel cracks which can lead to spallation.

Citation

Kyaw, S., Jones, I., & Hyde, T. (2016). Simulation of failure of air plasma sprayed thermal barrier coating due to interfacial and bulk cracks using surface-based cohesive interaction and extended finite element method. Journal of Strain Analysis for Engineering Design, 51(2), https://doi.org/10.1177/0309324715615746

Journal Article Type Article
Acceptance Date Oct 13, 2015
Publication Date Feb 1, 2016
Deposit Date Aug 15, 2016
Publicly Available Date Mar 29, 2024
Journal Journal of Strain Analysis for Engineering Design
Print ISSN 0309-3247
Electronic ISSN 2041-3130
Publisher SAGE Publications
Peer Reviewed Peer Reviewed
Volume 51
Issue 2
DOI https://doi.org/10.1177/0309324715615746
Keywords TBC, cohesive interaction, XFEM, crack growth, spallation
Public URL https://nottingham-repository.worktribe.com/output/770810
Publisher URL http://sdj.sagepub.com/content/51/2/132

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