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

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Author

Summary, in English

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.

Publishing year

2004

Language

English

Pages

554-560

Publication/Series

Journal of Thermal Spray Technology

Volume

13

Issue

4

Document type

Journal article

Publisher

Springer

Topic

  • Applied Mechanics
  • Materials Engineering

Keywords

  • coating
  • thermal barrier
  • short cracks
  • crack closure
  • finite element modeling
  • thermally grown oxide

Status

Published

ISBN/ISSN/Other

  • ISSN: 1544-1016