Novel method of high-temperature digital image correlation with simultaneous in-situ synchrotron X-ray diffraction measurements under thermomechanical conditions - Matériaux (MAT)
Article Dans Une Revue Review of Scientific Instruments Année : 2020

Novel method of high-temperature digital image correlation with simultaneous in-situ synchrotron X-ray diffraction measurements under thermomechanical conditions

Lin Rossmann
Brooke Sarley
  • Fonction : Auteur
Johnathan Hernandez
  • Fonction : Auteur
Peter Kenesei
  • Fonction : Auteur
Alain Köster
  • Fonction : Auteur
Janine Wischek
  • Fonction : Auteur
Jonathan Almer
  • Fonction : Auteur
Vincent Maurel
Marion Bartsch
  • Fonction : Auteur
Seetha Raghavan

Résumé

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.
Fichier principal
Vignette du fichier
LinRossmanDICpaper_RSI_20.pdf (2.25 Mo) Télécharger le fichier
Origine Fichiers produits par l'(les) auteur(s)

Dates et versions

hal-04686196 , version 1 (03-09-2024)

Identifiants

Citer

Lin Rossmann, Brooke Sarley, Johnathan Hernandez, Peter Kenesei, Alain Köster, et al.. Novel method of high-temperature digital image correlation with simultaneous in-situ synchrotron X-ray diffraction measurements under thermomechanical conditions. Review of Scientific Instruments, 2020, 91 (3), ⟨10.1063/1.5124496⟩. ⟨hal-04686196⟩
0 Consultations
0 Téléchargements

Altmetric

Partager

More