On stresses induced in a thermal barrier coating due to indentation testing

Jin YAN, Anette M. KARLSSON*, Marion BARTSCH, Xi CHEN

*Corresponding author for this work

Research output: Journal PublicationsJournal Article (refereed)peer-review

13 Citations (Scopus)

Abstract

Instrumented indentation has been suggested as a method to determine interfacial fracture toughness of thermal barrier coatings. However, in a previous experimental study we showed that the results are ambiguous. In this work, we investigate the experimental results by numerical simulations incorporating the material microstructure. In the numerical simulations, based on finite element analyses, the stress fields that are associated with the loading and unloading of the indenter are investigated. By comparing these stress fields to the damage observed in the experimental study, including crack path and interfacial delaminations, we explain key findings from the experimental observations. Our results suggest that indentation testing of multilayered coated structures might not induce the delamination in the overall weakest interface and therefore the test results must be evaluated with care. © 2008 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)1178-1191
Number of pages14
JournalComputational Materials Science
Volume44
Issue number4
DOIs
Publication statusPublished - Feb 2009
Externally publishedYes

Bibliographical note

The authors acknowledge the financial support by the National Science Foundation, DMR-0346664 and the Office of Naval Research ONR-N00014-04-1-0498 (JY and AMK), the European Community’s Human Potential Program under contract HPRN-CT-2002-00203 [SICMAC] (MB), and NSF CMS-0407743 (XC).

Keywords

  • Indentation
  • Interfacial fracture toughness
  • Multilayered coatings
  • Numerical simulations
  • Thermal barrier coatings (TBC)

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