On TGO Creep and the Initiation of a Class of Fatigue Cracks in Thermal Barrier Coatings

Mercedes T. Hernandez; Anette M. Karlsson; Marion Bartsch

doi:10.1016/j.surfcoat.2009.05.018

On TGO Creep and the Initiation of a Class of Fatigue Cracks in Thermal Barrier Coatings

Mercedes T. Hernandez, Anette M. Karlsson, Marion Bartsch

German Aerospace Center

Research output: Contribution to journal › Article › peer-review

Abstract

The initiation of a class of fatigue cracks observed in thermal barrier coatings (TBCs) subjected to thermal gradient mechanical fatigue testing is investigated. The coating system is based on a NiCoCrAlY bond coat and a partially yttria stabilized zirconia top coat. To explain the development of the cracks of interest, the thermo-mechanical response of the bond coat and the thermally grown oxide (TGO) is examined and quantified through finite element analyses. The models include non-linear and time-dependent behavior such as creep, TGO growth stress, and thermo-mechanical cyclic loading. The simulations suggest that stress-redistribution due to creep can lead to tensile stresses in the TGO during TGMF testing that are large enough to initiate the cracks investigated.

Original language	American English
Journal	Surface and Coatings Technology
Volume	203
DOIs	https://doi.org/10.1016/j.surfcoat.2009.05.018
State	Published - Aug 25 2009

Keywords

Thermal barrier coatings; Thermally grown oxide; Creep; Fatigue cracks; Finite element analysis

Disciplines

Mechanical Engineering

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10.1016/j.surfcoat.2009.05.018License: CC BY

On TGO Creep and the Initiation of a Class of Fatigue Cracks in TFinal published version, 2.53 MBLicense: CC BY

http://journals.ohiolink.edu/ejc/article.cgi?issn=02578972&issue=v203i0023&article=3549_otcatifcitbc

Cite this

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title = "On TGO Creep and the Initiation of a Class of Fatigue Cracks in Thermal Barrier Coatings",

abstract = " The initiation of a class of fatigue cracks observed in thermal barrier coatings (TBCs) subjected to thermal gradient mechanical fatigue testing is investigated. The coating system is based on a NiCoCrAlY bond coat and a partially yttria stabilized zirconia top coat. To explain the development of the cracks of interest, the thermo-mechanical response of the bond coat and the thermally grown oxide (TGO) is examined and quantified through finite element analyses. The models include non-linear and time-dependent behavior such as creep, TGO growth stress, and thermo-mechanical cyclic loading. The simulations suggest that stress-redistribution due to creep can lead to tensile stresses in the TGO during TGMF testing that are large enough to initiate the cracks investigated.",

keywords = "Thermal barrier coatings; Thermally grown oxide; Creep; Fatigue cracks; Finite element analysis",

author = "Hernandez, \{Mercedes T.\} and Karlsson, \{Anette M.\} and Marion Bartsch",

note = "Hernandez, M. T., Karlsson, A. M., and Bartsch, M., 2009, {"}On TGO Creep and the Initiation of a Class of Fatigue Cracks in Thermal Barrier Coatings,{"} Surface \& Coatings Technology, 203(23) pp. 3549-3558.",

year = "2009",

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doi = "10.1016/j.surfcoat.2009.05.018",

language = "American English",

volume = "203",

journal = "Surface and Coatings Technology",

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T1 - On TGO Creep and the Initiation of a Class of Fatigue Cracks in Thermal Barrier Coatings

AU - Hernandez, Mercedes T.

AU - Karlsson, Anette M.

AU - Bartsch, Marion

N1 - Hernandez, M. T., Karlsson, A. M., and Bartsch, M., 2009, "On TGO Creep and the Initiation of a Class of Fatigue Cracks in Thermal Barrier Coatings," Surface & Coatings Technology, 203(23) pp. 3549-3558.

PY - 2009/8/25

Y1 - 2009/8/25

N2 - The initiation of a class of fatigue cracks observed in thermal barrier coatings (TBCs) subjected to thermal gradient mechanical fatigue testing is investigated. The coating system is based on a NiCoCrAlY bond coat and a partially yttria stabilized zirconia top coat. To explain the development of the cracks of interest, the thermo-mechanical response of the bond coat and the thermally grown oxide (TGO) is examined and quantified through finite element analyses. The models include non-linear and time-dependent behavior such as creep, TGO growth stress, and thermo-mechanical cyclic loading. The simulations suggest that stress-redistribution due to creep can lead to tensile stresses in the TGO during TGMF testing that are large enough to initiate the cracks investigated.

AB - The initiation of a class of fatigue cracks observed in thermal barrier coatings (TBCs) subjected to thermal gradient mechanical fatigue testing is investigated. The coating system is based on a NiCoCrAlY bond coat and a partially yttria stabilized zirconia top coat. To explain the development of the cracks of interest, the thermo-mechanical response of the bond coat and the thermally grown oxide (TGO) is examined and quantified through finite element analyses. The models include non-linear and time-dependent behavior such as creep, TGO growth stress, and thermo-mechanical cyclic loading. The simulations suggest that stress-redistribution due to creep can lead to tensile stresses in the TGO during TGMF testing that are large enough to initiate the cracks investigated.

KW - Thermal barrier coatings; Thermally grown oxide; Creep; Fatigue cracks; Finite element analysis

UR - https://engagedscholarship.csuohio.edu/enme_facpub/116

U2 - 10.1016/j.surfcoat.2009.05.018

DO - 10.1016/j.surfcoat.2009.05.018

M3 - Article

VL - 203

JO - Surface and Coatings Technology

JF - Surface and Coatings Technology

ER -

On TGO Creep and the Initiation of a Class of Fatigue Cracks in Thermal Barrier Coatings

Abstract

Keywords

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