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A study of damage evolution in high purity nano TBCs during thermal cycling: A fracture mechanics based modelling approach
Linköping University, Department of Management and Engineering, Engineering Materials. Linköping University, Faculty of Science & Engineering.
Linköping University, Department of Management and Engineering, Solid Mechanics. Linköping University, Faculty of Science & Engineering.
Beijing Gen Research Institute Min and Met, Peoples R China.
Siemens Ind Turbomachineiy AB, Sweden.
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2017 (English)In: Journal of the European Ceramic Society, ISSN 0955-2219, E-ISSN 1873-619X, Vol. 37, no 8, 2889-2899 p.Article in journal (Refereed) Published
Abstract [en]

This work concerns the study of damage evolution in a newly developed high purity nano 8YSZ thermal barrier coating during thermal cyclic fatigue tests (TCF). TCF tests were conducted between 100 degrees C-1100 degrees C with a hold time of 1 hat 1100 degrees C, first till failure and later for interrupted tests. Cross section analysis along the diameter of the interrupted test samples revealed a mixed-type failure and that the most of the damage occurred towards the end of the coatings life. To understand the most likely crack growth mechanism leading to failure, different crack growth paths have been modelled using finite element analysis. Crack growing from an existing defect in the top coat towards the top coat/TGO interface has been identified as the most likely mechanism. Estimated damage by the model could predict the rapid increase in the damage towards the end of the coatings life. (C) 2017 Elsevier Ltd. All rights reserved.

Place, publisher, year, edition, pages
ELSEVIER SCI LTD , 2017. Vol. 37, no 8, 2889-2899 p.
Keyword [en]
Thermal cyclic fatigue; High purity nano YSZ; Crack growth modelling; Damage evolution
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:liu:diva-137827DOI: 10.1016/jjeurceramsoc.2017.02.054ISI: 000400531500015OAI: oai:DiVA.org:liu-137827DiVA: diva2:1105256
Note

Funding Agencies|Vinnova in Sweden

Available from: 2017-06-02 Created: 2017-06-02 Last updated: 2017-06-02

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Jonnalagadda, Krisha PraveenEriksson, RobertPeng, Ru
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CiteExportLink to record
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Citation style
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