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Long crack behavior in a thermal barrier coating upon thermal shock loading

Liu, Yan LU ; Persson, Christer LU ; Melin, Solveig LU and Wigren, Jan (2005) In Journal of Thermal Spray Technology 14(2). p.258-263
Abstract
The behavior of macroscopic long cracks in the ceramic top coat of a thermal barrier coating (TBC) system subjected to thermal shock loading and the influence of the cracks on the coating durability were investigated experimentally and numerically. Thermal shock testing was conducted until coating failure. Comparisons were made with coating samples without macroscopic cracks. The experimental results revealed that the presence of macroscopic cracks reduces the life of the TBC. The finite-element method, with a fracture mechanics approach, was applied to analyze preexisting long cracks, and the calculations correlate well with the experimental findings. It was found that the life of the coating is reduced with crack length as well as with... (More)
The behavior of macroscopic long cracks in the ceramic top coat of a thermal barrier coating (TBC) system subjected to thermal shock loading and the influence of the cracks on the coating durability were investigated experimentally and numerically. Thermal shock testing was conducted until coating failure. Comparisons were made with coating samples without macroscopic cracks. The experimental results revealed that the presence of macroscopic cracks reduces the life of the TBC. The finite-element method, with a fracture mechanics approach, was applied to analyze preexisting long cracks, and the calculations correlate well with the experimental findings. It was found that the life of the coating is reduced with crack length as well as with maximum cycle temperature. It was also found that the stress-intensity factors for long cracks are initially high and decrease with the number of temperature cycles, which indicates that rapid crack growth occurs during the first number of cycles. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
long cracks, thermal barrier coatings, finite-element method, thermal, shock tests
in
Journal of Thermal Spray Technology
volume
14
issue
2
pages
258 - 263
publisher
Springer
external identifiers
  • wos:000229564700045
  • scopus:21344438361
ISSN
1544-1016
DOI
10.1361/10599630523836
language
English
LU publication?
yes
id
ddecc1eb-cc70-444a-8346-e0b4113b8dc3 (old id 237380)
date added to LUP
2007-08-16 14:33:47
date last changed
2017-01-01 05:16:49
@article{ddecc1eb-cc70-444a-8346-e0b4113b8dc3,
  abstract     = {The behavior of macroscopic long cracks in the ceramic top coat of a thermal barrier coating (TBC) system subjected to thermal shock loading and the influence of the cracks on the coating durability were investigated experimentally and numerically. Thermal shock testing was conducted until coating failure. Comparisons were made with coating samples without macroscopic cracks. The experimental results revealed that the presence of macroscopic cracks reduces the life of the TBC. The finite-element method, with a fracture mechanics approach, was applied to analyze preexisting long cracks, and the calculations correlate well with the experimental findings. It was found that the life of the coating is reduced with crack length as well as with maximum cycle temperature. It was also found that the stress-intensity factors for long cracks are initially high and decrease with the number of temperature cycles, which indicates that rapid crack growth occurs during the first number of cycles.},
  author       = {Liu, Yan and Persson, Christer and Melin, Solveig and Wigren, Jan},
  issn         = {1544-1016},
  keyword      = {long cracks,thermal barrier coatings,finite-element method,thermal,shock tests},
  language     = {eng},
  number       = {2},
  pages        = {258--263},
  publisher    = {Springer},
  series       = {Journal of Thermal Spray Technology},
  title        = {Long crack behavior in a thermal barrier coating upon thermal shock loading},
  url          = {http://dx.doi.org/10.1361/10599630523836},
  volume       = {14},
  year         = {2005},
}