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Strain response of thermal barrier coatings captured under extreme engine environments through synchrotron X-ray diffraction

Knipe, Kevin and Manero, Albert and Siddiqui, Sanna and Meid, Carla and Wischek, Janine and Okasinski, John and Almer, Jonathan and Karlsson, Anette M. and Bartsch, Marion and Raghavan, Seetha (2014) Strain response of thermal barrier coatings captured under extreme engine environments through synchrotron X-ray diffraction. Nature Communications, 5, e4559. Nature Publishing Group. DOI: 10.1038/ncomms5559 ISSN 2041-1723

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Official URL: http://www.nature.com/ncomms/2014/140731/ncomms5559/full/ncomms5559.html

Abstract

The mechanical behaviour of thermal barrier coatings in operation holds the key to understanding durability of jet engine turbine blades. Here we report the results from experiments that monitor strains in the layers of a coating subjected to thermal gradients and mechanical loads representing extreme engine environments. Hollow cylindrical specimens, with electron beam physical vapour deposited coatings, were tested with internal cooling and external heating under various controlled conditions. High-energy synchrotron X-ray measurements captured the in situ strain response through the depth of each layer, revealing the link between these conditions and the evolution of local strains. Results of this study demonstrate that variations in these conditions create corresponding trends in depth-resolved strains with the largest effects displayed at or near the interface with the bond coat. With larger temperature drops across the coating, significant strain gradients are seen, which can contribute to failure modes occurring within the layer adjacent to the interface.

Item URL in elib:https://elib.dlr.de/90087/
Document Type:Article
Title:Strain response of thermal barrier coatings captured under extreme engine environments through synchrotron X-ray diffraction
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Knipe, KevinUniversity of Central Florida, Orlando, FL, USAUNSPECIFIED
Manero, AlbertUniversity of Central Florida, Orlando, FL, USAUNSPECIFIED
Siddiqui, SannaUniversity of Central Florida, Orlando, FL, USAUNSPECIFIED
Meid, Carlacarla.meid (at) dlr.deUNSPECIFIED
Wischek, Janinejanine.wischek (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.deUNSPECIFIED
Raghavan, SeethaUniversity of Central Florida, Orlando, FL, USAUNSPECIFIED
Date:31 July 2014
Journal or Publication Title:Nature Communications
Refereed publication:Yes
Open Access:Yes
In DOAJ:Yes
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:5
DOI :10.1038/ncomms5559
Page Range:e4559
Publisher:Nature Publishing Group
ISSN:2041-1723
Status:Published
Keywords:Thermal barrier coating, strain measurement, X-ray diffraction
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
Deposited By: Bartsch, Dr.-Ing. Marion
Deposited On:15 Sep 2014 09:01
Last Modified:08 Mar 2018 18:35

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