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Numerical Modeling of short crack behavior in a thermal barrier coating upon thermal shock loading

Liu, Yan LU ; Persson, Christer LU and Melin, Solveig LU (2004) In Journal of Thermal Spray Technology 13(4). p.554-560
Abstract
The behavior of microstructurally short inherent cracks within a preoxidized thermal barrier coating system upon thermal shock loading is considered. A thin alumina oxide layer holding residual stresses was induced at the ceramic/metal interface to simulate thermally grown oxide on the bond coat. Undulation of the oxidized bond coat was modeled as a sinusoidal surface. The variations of the stress-intensity factors of inherent centrally located cracks and of edge cracks were calculated during the thermal cycling. The instant crack shapes during the first thermal cycle and at steady state were investigated. It was found that oxide layer thickness, crack tip location, as well as interfacial undulation are factors influencing the risk of... (More)
The behavior of microstructurally short inherent cracks within a preoxidized thermal barrier coating system upon thermal shock loading is considered. A thin alumina oxide layer holding residual stresses was induced at the ceramic/metal interface to simulate thermally grown oxide on the bond coat. Undulation of the oxidized bond coat was modeled as a sinusoidal surface. The variations of the stress-intensity factors of inherent centrally located cracks and of edge cracks were calculated during the thermal cycling. The instant crack shapes during the first thermal cycle and at steady state were investigated. It was found that oxide layer thickness, crack tip location, as well as interfacial undulation are factors influencing the risk of crack propagation. It was also found that an edge crack constitutes a greater threat to the coating durability than a central crack. The propagation of an edge crack, if it occurs, will take place during the first load cycle, whereas for a central crack, crack tip position decides the risk of crack propagation. (Less)
Please use this url to cite or link to this publication:
author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
coating, thermal barrier, short cracks, crack closure, finite element modeling, thermally grown oxide
in
Journal of Thermal Spray Technology
volume
13
issue
4
pages
554 - 560
publisher
Springer
external identifiers
  • wos:000226082400019
  • scopus:12344262845
ISSN
1544-1016
DOI
10.1361/10599630421488
language
English
LU publication?
yes
id
23c49ec5-97ad-4b4e-900d-d0b871202269 (old id 256040)
date added to LUP
2007-10-24 20:11:50
date last changed
2017-09-24 03:28:09
@article{23c49ec5-97ad-4b4e-900d-d0b871202269,
  abstract     = {The behavior of microstructurally short inherent cracks within a preoxidized thermal barrier coating system upon thermal shock loading is considered. A thin alumina oxide layer holding residual stresses was induced at the ceramic/metal interface to simulate thermally grown oxide on the bond coat. Undulation of the oxidized bond coat was modeled as a sinusoidal surface. The variations of the stress-intensity factors of inherent centrally located cracks and of edge cracks were calculated during the thermal cycling. The instant crack shapes during the first thermal cycle and at steady state were investigated. It was found that oxide layer thickness, crack tip location, as well as interfacial undulation are factors influencing the risk of crack propagation. It was also found that an edge crack constitutes a greater threat to the coating durability than a central crack. The propagation of an edge crack, if it occurs, will take place during the first load cycle, whereas for a central crack, crack tip position decides the risk of crack propagation.},
  author       = {Liu, Yan and Persson, Christer and Melin, Solveig},
  issn         = {1544-1016},
  keyword      = {coating,thermal barrier,short cracks,crack closure,finite element modeling,thermally grown oxide},
  language     = {eng},
  number       = {4},
  pages        = {554--560},
  publisher    = {Springer},
  series       = {Journal of Thermal Spray Technology},
  title        = {Numerical Modeling of short crack behavior in a thermal barrier coating upon thermal shock loading},
  url          = {http://dx.doi.org/10.1361/10599630421488},
  volume       = {13},
  year         = {2004},
}