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Method for conducting in situ high-temperature digital image correlation with simultaneous synchrotron measurements under thermomechanical conditions

Rossmann, Linda and Sarley, Brooke and Hernandez, Jonathan and Kenesei, Peter and Koster, Alain and Wischek, Janine and Almer, Jonathan and Maurel, Vincent and Bartsch, Marion and Raghavan, Seetha (2020) Method for conducting in situ high-temperature digital image correlation with simultaneous synchrotron measurements under thermomechanical conditions. Review of Scientific Instruments, 91, e033705. American Institute of Physics (AIP). doi: 10.1063/1.5124496. ISSN 0034-6748.

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Official URL: https://aip.scitation.org/doi/10.1063/1.5124496

Abstract

This work presents a novel method of obtaining in situ strain measurements at high temperature by simultaneous digital image correlation (DIC), which provides the total strain on the specimen surface, and synchrotron x-ray diffraction (XRD), which provides lattice strains of crystalline materials. DIC at high temperature requires specialized techniques to overcome the effects of increased blackbody radiation that would otherwise overexpose the images. The technique presented herein is unique in that it can be used with a sample enclosed in an infrared heater, remotely and simultaneously with synchrotron XRD measurements. The heater included a window for camera access, and the light of the heater lamps is used as illumination. High-temperature paint is used to apply a random speckle pattern to the sample to allow the tracking of displacements and the calculation of the DIC strains. An inexpensive blue theatrical gel filter is used to block interfering visible and infrared light at high temperatures. This technique successfully produces properly exposed images at 870 ○C and is expected to perform similarly at higher temperatures. The average strains measured by DIC were validated by an analytical calculation of the theoretical strain. Simultaneous DIC and XRD strain measurements of Inconel 718 (IN718) tensile test specimens were performed under thermal and mechanical loads and evaluated. This approach uses the fact that with DIC, the total strain is measured, including plastic strain, while with XRD, only elastic strain is captured. The observed differences were discussed with respect to the effective deformation mechanisms.

Item URL in elib:https://elib.dlr.de/137555/
Document Type:Article
Title:Method for conducting in situ high-temperature digital image correlation with simultaneous synchrotron measurements under thermomechanical conditions
Authors:
AuthorsInstitution or Email of AuthorsAuthor's ORCID iD
Rossmann, LindaUniversity of Central FloridaUNSPECIFIED
Sarley, BrookeUniversity of Central Florida, Orlando, FL, USAUNSPECIFIED
Hernandez, JonathanUniversity of Central Florida, Orlando, FL, USAUNSPECIFIED
Kenesei, Peteradvanced photon source, argonne national laboratory, argonne, illinoisUNSPECIFIED
Koster, AlainCentre des Materiaux, Mines Paris Tech, CNRS UMR 7633, PSL Research UniversityUNSPECIFIED
Wischek, Janinejanine.wischek (at) dlr.deUNSPECIFIED
Almer, JonathanX-Ray Science Division, Advanced Photon Source, Argonne National Laboratory, Argonne, IL 60439,UNSPECIFIED
Maurel, VincentCentre des Materiaux, Mines Paris Tech, CNRS UMR 7633, PSL Research UniversityUNSPECIFIED
Bartsch, MarionMarion.Bartsch (at) dlr.dehttps://orcid.org/0000-0002-3952-2928
Raghavan, SeethaDepartment of Mechanical and Aerospace Engineering, University of Central Florida, Orlando, FL 32816,UNSPECIFIED
Date:5 March 2020
Journal or Publication Title:Review of Scientific Instruments
Refereed publication:Yes
Open Access:Yes
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:91
DOI :10.1063/1.5124496
Page Range:e033705
Publisher:American Institute of Physics (AIP)
ISSN:0034-6748
Status:Published
Keywords:Image correlation, Optical metrology, Thermomechanical loading, Strain measurement, Synchrotron 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 (old)
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:16 Nov 2020 17:08
Last Modified:06 Mar 2021 03:00

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