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Capturing the Competing Influence of Thermal and Mechanical Loads on the Strain of Turbine Blade Coatings via High Energy X-rays

Manero, Albert and Knipe, Kevin and Wischek, Janine and Meid, Carla and Okasinski, John and Almer, Jonathan and Karlsson, Anette M. and Bartsch, Marion and Raghavan, Seetha (2018) Capturing the Competing Influence of Thermal and Mechanical Loads on the Strain of Turbine Blade Coatings via High Energy X-rays. Coatings, 8(9) (320), pp. 1-12. Multidisciplinary Digital Publishing Institute (MDPI). DOI: doi:10.3390/coatings8090320 ISBN ISSN 2079-6412 ISSN 2079-6412

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Official URL: https://www.mdpi.com/2079-6412/8/9/320

Abstract

This paper presents findings of synchrotron diffraction measurements on tubular specimens with a thermal barrier coating (TBC) system applied by electron beam physical vapor deposition (EB-PVD), having a thermally grown oxide (TGO) layer due to aging in hot air. The diffraction measurements were in situ while applying a thermal cycle with high temperature holds at 1000 °C and varying internal air cooling mass flow and mechanical load. It was observed that, during high temperature holds at 1000 °C, the TGO strain approached zero if no mechanical load or internal cooling was applied. When applying a mechanical load, the TGO in-plane strain (e22) changed to tensile and the out of plane TGO strain (e11) became compressive. The addition of internal cooling induced a thermal gradient, yielding a competing effect, driving the e22 strain to compressive and e11 strain to tensile. Quantifying TGO strain variations in response to competing factors will provide a path to controlling the TGO strain, and further improving the lifetime assessment and durability design strategies for TBC systems.

Item URL in elib:https://elib.dlr.de/122954/
Document Type:Article
Title:Capturing the Competing Influence of Thermal and Mechanical Loads on the Strain of Turbine Blade Coatings via High Energy X-rays
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Manero, AlbertUniversity of Central Florida, Orlando, FL, USAUNSPECIFIED
Knipe, KevinUniversity of Central Florida, Orlando, FL, USAUNSPECIFIED
Wischek, Janinejanine.wischek (at) dlr.deUNSPECIFIED
Meid, Carlacarla.meid (at) dlr.deUNSPECIFIED
Okasinski, JohnAdvanced Photon Source, Argonne National Laboratory, Argonne, IllinoisUNSPECIFIED
Almer, JonathanAdvanced Photon Source, Argonne National Laboratory, Argonne, IllinoisUNSPECIFIED
Karlsson, Anette M.Cleveland State University, Ohio, USAUNSPECIFIED
Bartsch, Marionmarion.bartsch (at) dlr.dehttps://orcid.org/0000-0002-3952-2928
Raghavan, SeethaUniversity of Central Florida, Orlando, FL, USAUNSPECIFIED
Date:10 September 2018
Journal or Publication Title:Coatings
Refereed publication:Yes
Open Access:Yes
Gold Open Access:Yes
In SCOPUS:No
In ISI Web of Science:Yes
Volume:8(9)
DOI :doi:10.3390/coatings8090320
Page Range:pp. 1-12
Publisher:Multidisciplinary Digital Publishing Institute (MDPI)
ISSN:2079-6412
ISBN:ISSN 2079-6412
Status:Published
Keywords:thermal barrier coatings; thermal gradient mechanical load; synchrotron
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Aeronautics
HGF - Program Themes:propulsion systems
DLR - Research area:Aeronautics
DLR - Program:L ER - Engine Research
DLR - Research theme (Project):L - Virtual Engine and Validation methods
Location: Köln-Porz
Institutes and Institutions:Institute of Materials Research > Experimental and Numerical Methods
Institute of Materials Research > Mechanical Testing of Materials
Deposited By: Bartsch, Dr.-Ing. Marion
Deposited On:20 Nov 2018 08:57
Last Modified:20 Nov 2018 08:57

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