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The role of cyclic mechanical loading and thermal gradients in damage behavior of thermal barrier coating systems

Bartsch, Marion and Baufeld, Bernd and Dalkilic, Serdar and Heinzelmann, Michael (2005) The role of cyclic mechanical loading and thermal gradients in damage behavior of thermal barrier coating systems. In: Ceramic Engineering and Science Proceedings, Vol. 26 (3), pp. 103-110. The American Ceramic Society. 29th International Conference on Advanced Ceramics and Composites, 2005-01-23 - 2004-01-28, Cocoa Beach, FL (USA). ISBN 1-57498-249-4

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Abstract

Ceramic thermal barrier coatings (TBC) can exhibit premature in-service failure due to spallation as a consequence of exposure to elevated temperatures, aggressive environments, and cyclic thermal and mechanical loading. In this study, the influence of cyclic mechanical loading and thermal gradients on the damage mechanisms in TBC systems is investigated. Performed tests were thermal fatigue with superimposed mechanical fatigue load and thermal gradient over the cross section as well as isothermal mechanical fatigue at high temperature. The stress states generated by mechanical loading and thermal gradients in the course of the respective test cycle were analyzed by Finite Element calculations. The calculated stress distributions were used to discuss specific damage patterns observed for the different test types. In the case of thermal gradient mechanical fatigue tests, which generate stresses most closely to in-service conditions of rotating gas turbine blades, the observed evolution of cracks parallel to the coating surface can explain accelerated TBC spallation.

Item URL in elib:https://elib.dlr.de/20288/
Document Type:Conference or Workshop Item (Speech, Paper)
Title:The role of cyclic mechanical loading and thermal gradients in damage behavior of thermal barrier coating systems
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Bartsch, MarionUNSPECIFIEDUNSPECIFIED
Baufeld, BerndUNSPECIFIEDUNSPECIFIED
Dalkilic, SerdarAnadoulu University, Eskisehir, TurkeyUNSPECIFIED
Heinzelmann, MichaelFachhochschule Bonn-Rhein-SiegUNSPECIFIED
Date:2005
Journal or Publication Title:Ceramic Engineering and Science Proceedings
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Volume:Vol. 26
Page Range:pp. 103-110
Editors:
EditorsEmail
Zhu, DongmingUNSPECIFIED
Kriven, Waltraud M.UNSPECIFIED
Publisher:The American Ceramic Society
ISBN:1-57498-249-4
Status:Published
Keywords:Thermomechanical testing, thermal barrier coatings, thermal gradients
Event Title:29th International Conference on Advanced Ceramics and Composites
Event Location:Cocoa Beach, FL (USA)
Event Type:international Conference
Event Dates:2005-01-23 - 2004-01-28
Organizer:The American Ceramic Society
HGF - Research field:Aeronautics, Space and Transport (old)
HGF - Program:Aeronautics
HGF - Program Themes:L VU - Air Traffic and Environment (old)
DLR - Research area:Aeronautics
DLR - Program:L VU - Air Traffic and Environment
DLR - Research theme (Project):L - Quiet Air Traffic (old)
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > High Temperature and Functional Coatings
Deposited By: Bartsch, Dr.-Ing. Marion
Deposited On:13 Dec 2005
Last Modified:27 Apr 2009 04:45

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