Damage analysis of thermal barrier coatings subjected to a high-velocity impingement of a solid sphere

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Abstract

A delamination of thermal barrier coatings (TBC) applied to turbine blades in gas turbine could be caused by a high-velocity impingement of various foreign objects. It is important to accurately predict the size of interfacial crack for safety operation of gas turbine. In this study, in order to establish a practical equation for prediction of the length of interfacial crack, a high velocity impingement test and a finite element analysis (FEA) based on a cohesive model were conducted. As the result, the length of interfacial crack is linearly increased with the impact velocity. In addition, it was confirmed that it was accurately estimated by the FEA. The equation for prediction of the length of interfacial crack was formulated based on these results and the energy conservation before and after impingement. Finally, the applicability of the equation was demonstrated in a wide range of impact velocity through a comparison with the experimental results.

Original languageEnglish
Title of host publicationAdvances in Fracture and Damage Mechanics XVIII
EditorsS.A. Paipetis, Ferri M.H. Aliabadi
PublisherTrans Tech Publications Ltd
Pages349-354
Number of pages6
ISBN (Print)9783035715866
DOIs
Publication statusPublished - 1 Jan 2020
Event18th International Conference on Fracture and Damage Mechanics, FDM 2019 - Rhodes, Greece
Duration: 16 Sep 201918 Sep 2019

Publication series

NameKey Engineering Materials
Volume827 KEM
ISSN (Print)1013-9826
ISSN (Electronic)1662-9795

Conference

Conference18th International Conference on Fracture and Damage Mechanics, FDM 2019
CountryGreece
CityRhodes
Period16/09/1918/09/19

Keywords

  • Delamination
  • Finite Element Analysis
  • Foreign object damage
  • High-velocity impingement
  • Thermal barrier coating

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