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Acquisition Techniques for Synchrotron XRay Strain Measurements in Tubular TBC Specimens for Thermal Gradient Mechanical Testing

Knipe, Kevin and Manero, Albert and Siddiqui, Sanna and Scott, Steve and Raghavan, Seetha and Meid, Carla and Schneider, Janine and Bartsch, Marion and Almer, Jonathan and Okasinski, John (2013) Acquisition Techniques for Synchrotron XRay Strain Measurements in Tubular TBC Specimens for Thermal Gradient Mechanical Testing. 37th International Conference and Expo on Advanced Ceramics and Composites, 27. Jan.- 01. Feb. 2013, Daytona, FL, USA.

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Abstract

This research aims to develop techniques to accurately obtain in-situ strain measurements of thermal barrier coating systems (TBCs) applied to tubular specimens. EB-PVD coated tubular samples with internal cooling were designed to achieve realistic temperature drops over the TBC coatings. Effects of the circular cross-section on the x-ray diffraction (XRD) strain measurements in the various layers, including the thermally grown oxide (TGO), are investigated using a high energy synchrotron operating at 86 keV. Multiple approaches for beam penetration, including both tangential and normal to the layers, along with variations in collection parameters are compared for their ability to attain high-resolution XRD rings of the internal layers. To account for the measurement through the layers, results from the acquisition techniques are analyzed to isolate the diffraction rings of the various materials. The techniques are compared to experiments aligning the x-ray beam parallel to the in-plane direction of flat specimens, providing insight for the compensation of the non-symmetrical material composition in the diffraction volume. Results are used to summarize the various techniques for obtaining depth-resolved strains through multi-layered coating systems. The outcomes will pave the way towards goals in achieving realistic in-situ testing of these coatings.

Item URL in elib:https://elib.dlr.de/83593/
Document Type:Conference or Workshop Item (Speech)
Title:Acquisition Techniques for Synchrotron XRay Strain Measurements in Tubular TBC Specimens for Thermal Gradient Mechanical Testing
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
Scott, SteveUniversity of Central Florida, Orlando, FL, USAUNSPECIFIED
Raghavan, SeethaUniversity of Central Florida, Orlando, FL, USAUNSPECIFIED
Meid, CarlaDLR WF (ENM)UNSPECIFIED
Schneider, JanineDLR WF (WMP)UNSPECIFIED
Bartsch, Marionmarion.bartsch (at) dlr.deUNSPECIFIED
Almer, JonathanAdvanced Photon Source, Argonne National Laboratory, Argonne, IllinoisUNSPECIFIED
Okasinski, JohnAdvanced Photon Source, Argonne National Laboratory, Argonne, IllinoisUNSPECIFIED
Date:28 January 2013
Refereed publication:No
Open Access:No
In DOAJ:No
In SCOPUS:No
In ISI Web of Science:No
Status:Published
Keywords:Thermal Barrier Coating, thermal mechanical fatigue, in situ strain measurement, X-ray diffraction, synchrotron radiation
Event Title:37th International Conference and Expo on Advanced Ceramics and Composites
Event Location:Daytona, FL, USA
Event Type:international Conference
Event Dates:27. Jan.- 01. Feb. 2013
Organizer:American Ceramic Society
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:29 Aug 2013 11:12
Last Modified:29 Aug 2013 11:12

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