Bartsch, Marion and Hernandez, Mercedes T. and Karlsson, Anette (2009) Damage behavior of Thermal Barrier Coatings for gas turbine blades. Seminar on Materials Science , 5. Juni 2009, Nagaoka, Japan.
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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.
Item URL in elib: | https://elib.dlr.de/61356/ | ||||||||||||
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Document Type: | Conference or Workshop Item (Speech) | ||||||||||||
Title: | Damage behavior of Thermal Barrier Coatings for gas turbine blades | ||||||||||||
Authors: |
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Date: | 5 June 2009 | ||||||||||||
Refereed publication: | No | ||||||||||||
Open Access: | No | ||||||||||||
Gold Open Access: | No | ||||||||||||
In SCOPUS: | No | ||||||||||||
In ISI Web of Science: | No | ||||||||||||
Status: | Published | ||||||||||||
Keywords: | Thermal Barrier Coating System, EB-PVD, fatigue cracks | ||||||||||||
Event Title: | Seminar on Materials Science | ||||||||||||
Event Location: | Nagaoka, Japan | ||||||||||||
Event Type: | Other | ||||||||||||
Event Dates: | 5. Juni 2009 | ||||||||||||
Organizer: | Prof. Masakazu Okazaki, Nagaoka University of Technology | ||||||||||||
HGF - Research field: | Aeronautics, Space and Transport (old) | ||||||||||||
HGF - Program: | Aeronautics | ||||||||||||
HGF - Program Themes: | other | ||||||||||||
DLR - Research area: | Aeronautics | ||||||||||||
DLR - Program: | L - no assignment | ||||||||||||
DLR - Research theme (Project): | L - Low-Emission Air Traffic (old) | ||||||||||||
Location: | Köln-Porz | ||||||||||||
Institutes and Institutions: | Institute of Materials Research > Experimental and Numerical Methods | ||||||||||||
Deposited By: | Bartsch, Dr.-Ing. Marion | ||||||||||||
Deposited On: | 03 Dec 2009 15:22 | ||||||||||||
Last Modified: | 03 Dec 2009 15:22 |
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