Failure mechanisms of thermal barrier coatings at high temperature

Research output: Book Chapters | Papers in Conference ProceedingsConference paper (refereed)Referred Conference Paperpeer-review

2 Citations (Scopus)


Thermal barrier coatings (TBCs) are widely used in turbine engines. They are regarded as one of the most successful innovations and applications of coatings in industry. Thermal barrier system comprise thermally insulating materials having sufficient thickness and durability that they can sustain an appreciable temperature difference between the load bearing alloy and the coating surface. TBC exhibit multiple failure modes. Among them, the Foreign Object Damage (FOD) and mechanical erosion are the most prevalent failure modes of TBC at high temperature. In this study, based on a new scaling analysis of impact mechanics, FOD and erosion of TBCs are analyzed by using the finite element method. Impact and material variables are grouped into the smallest possible parameter set to provide explicit results. Microstructural effects are factored into the approach. Three different domains have been explored governed by particle size, velocity, temperature and TBC composition. Numerical simulations show that crack initiation is activated by transient stresses and delamination is governed by residual stresses. The transient stresses occurring near the free surface lead to crack initiation and material removal. Failure criterions are derived which provide useful insights on how to improve FOD and erosion resistances.
Original languageEnglish
Title of host publicationProceedings of the ASME Materials Division 2003 : presented at the 2003 ASME International Mechanical Engineering Congress & Exposition : November 15-21, 2003, Washington, D.C.
PublisherThe American Society of Mechanical Engineers(ASME)
Number of pages9
ISBN (Print)9780791837191
Publication statusPublished - 2003
Externally publishedYes
EventASME 2003 International Mechanical Engineering Congress and Exposition - Washington, United States
Duration: 15 Nov 200321 Nov 2003


CongressASME 2003 International Mechanical Engineering Congress and Exposition
Abbreviated titleASME 2003
Country/TerritoryUnited States


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