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Stress accumulation and damage behavior of EB-PVD thermal barrier coating systems under complex thermal mechanical fatigue loading

Bartsch, Marion and Schneider, Janine and Meid, Carla and Hernadez , Mercedes and Karlsson, Anette M. and Knipe, Kevin and Manero, Albert and Raghavan, Seetha and Almer, Jonathan and Okanzinski, John (2012) Stress accumulation and damage behavior of EB-PVD thermal barrier coating systems under complex thermal mechanical fatigue loading. Seminar of X-ray Science Division (XSD) at Advanced Photon Source, Argonne National Lab, 13. Nov. 2012, Argonne, Illinois, USA.

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Abstract

Thermal barrier coatings (TBC) are applied on cooled gas turbine components. Between the heated and cooled surfaces a thermal gradient develops, resulting for constraint components in high multiaxial stresses, which may exceed stresses due to mechanical loading. In order to investigate the damage behaviour of TBC systems under close to reality conditions, thermal mechanical fatigue tests with controlled thermal gradients (TGMF-tests) were performed on coated tubular specimens. The specimen substrate was made from directionally solidified nickel base superalloy IN100 DS, and the coating system comprised a NiCoCrAlY bond coat and a ceramic top coat from partially stabilized zirconia. In TGMF testing specific damages occurred underneath the adherent ceramic top coat, evolving into fatigue cracks, which propagated primarily in the metallic bond coat parallel to the surface. To explain the initiation and evolution of these fatigue cracks, the thermo-mechanical response of the bond coat and the thermally grown oxide (TGO) between bond coat and ceramic top coat is examined and quantified through finite element analyses. The models include non-linear and time-dependent behaviour 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. It is planned to verify the models by means of in-situ synchrotron X-ray strain measurements at Argonne National Laboratory on coated TGMF-specimens with the same geometry and the same coating system as used in the initial tests performed at DLR but with a newly built TGMF- test facility.

Item URL in elib:https://elib.dlr.de/79388/
Document Type:Conference or Workshop Item (Speech)
Title:Stress accumulation and damage behavior of EB-PVD thermal barrier coating systems under complex thermal mechanical fatigue loading
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Bartsch, Marionmarion.bartsch (at) dlr.deUNSPECIFIED
Schneider, JanineDLR WF (WP)UNSPECIFIED
Meid, CarlaDLR WF (ENM)UNSPECIFIED
Hernadez , MercedesUniversity of DelawareUNSPECIFIED
Karlsson, Anette M.Cleveland State University, Ohio, USAUNSPECIFIED
Knipe, KevinUniversity of Central Florida, Orlando, FL, USAUNSPECIFIED
Manero, AlbertUniversity of Central Florida, Orlando, FL, USAUNSPECIFIED
Raghavan, SeethaUniversity of Central Florida, Orlando, FL, USAUNSPECIFIED
Almer, JonathanAdvanced Photon Source, Argonne National Laboratory, Argonne, IllinoisUNSPECIFIED
Okanzinski, JohnAdvanced Photon Source, Argonne National Laboratory, Argonne, IllinoisUNSPECIFIED
Date:13 November 2012
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Keywords:Thermal Barrier Coatings, residual stress, synchrotron X-ray strain measurement, in situ strain measurement, thermal mechanical fatigue
Event Title:Seminar of X-ray Science Division (XSD) at Advanced Photon Source, Argonne National Lab
Event Location:Argonne, Illinois, USA
Event Type:Other
Event Dates:13. Nov. 2012
Organizer:X-ray Science Division (XSD) at Advanced Photon Source, Argonne National Lab
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:Propulsion Systems (old)
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Virtual Engine and Validation Methods (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Experimental and Numerical Methods
Deposited By: Bartsch, Dr.-Ing. Marion
Deposited On:04 Dec 2012 10:18
Last Modified:04 Dec 2012 10:18

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