A Phase Field Approach to Limited-angle Tomographic Reconstruction

Turpin, Léonard; Roux, Stéphane; Caty, Olivier; Denneulin, Sébastien

doi:10.3233/fi-2020-1901

Cited by 4 publications

(3 citation statements)

References 18 publications

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“…The efficiency of IRR depends a lot upon the quality of the filtering applied to the reconstructed volume. Recent work proposes a phase-field regularization based on the assumption that the sample is composed of a finite number of phases (Turpin et al, 2020). Using this regularization, the number of IRR iterations to reach convergence is as low as three Three stitched scans enlarge the field of view vertically (along the Z-axis).…”

Section: Processing Of Tomographic Datamentioning

confidence: 99%

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In situ tomographic study of a 3D-woven SiC/SiC composite part subjected to severe thermo-mechanical loads

Turpin

Roux

Caty

et al. 2022

J Synchrotron Radiat

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A high-temperature multi-axial test is carried out to characterize the thermo-mechanical behaviour of a 3D-woven SiC/SiC composite aeronautical part under loads representative of operating conditions. The sample is L-shaped and cut out from the part. It is subjected to severe thermal gradients and a superimposed mechanical load that progressively increases up to the first damage. The sample shape and its associated microstructure, the heterogeneity of the stress field and the limited accessibility to regions susceptible to damage require non-contact imaging modalities. An in situ experiment, conducted with a dedicated testing machine at the SOLEIL synchrotron facility, provides the sample microstructure from computed micro-tomographic imaging and thermal loads from infrared thermography. Experimental constraints lead to non-ideal acquisition conditions for both measurement modalities. This article details the procedure of correcting artefacts to use the volumes for quantitative exploitation (i.e. full-field measurement, model validation and identification). After proper processing, despite its complexity, the in situ experiment provides high-quality data about a part under realistic operating conditions. The influence of the mesostructure on fracture phenomena can be inferred from the tomography in the damaged state. Experiments show that the localization of damage initiation is driven by the geometry, while the woven structure moderates the crack propagation. This study widens the scope of in situ thermo-mechanical experiments to more complex loading states, closer to in-service conditions.

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Section: Processing Of Tomographic Datamentioning

confidence: 99%

“…They partially mask some projection directions during the tomographic acquisitions. Hence, tomographic reconstruction requires a bespoke algorithm (Turpin et al, 2020) and specific attention to the artefacts resulting from missing information.…”

Section: Introductionmentioning

confidence: 99%

In situ tomographic study of a 3D-woven SiC/SiC composite part subjected to severe thermo-mechanical loads

Turpin

Roux

Caty

et al. 2022

J Synchrotron Radiat

Self Cite

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“…Based on a modified two-column press (Klotz et al, 2004), the UToPEc is compact (Ø 170 mm, 20 kg) and can be installed on a high-speed rotation stage for continuous image acquisition. It is designed with a large 165 angular opening, and hence offers limited blind angles that can be tolerated or corrected for by reconstruction algorithms (Turpin et al, 2020). Pressures and temperatures up to 10 GPa and 1700 C can be targeted with a micrometric spatial resolution for 3D volumes recorded in less than 1 s at full rotation speed.…”

Section: Introductionmentioning

confidence: 99%

Quantitative 4D X-ray microtomography under extreme conditions: a case study on magma migration

Giovenco¹,

Perrillat²,

Boulard³

et al. 2021

J Synchrotron Rad

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X-ray computed tomography (XCT) is a well known method for three-dimensional characterization of materials that is established as a powerful tool in high-pressure/high-temperature research. The optimization of synchrotron beamlines and the development of fast high-efficiency detectors now allow the addition of a temporal dimension to tomography studies under extreme conditions. Presented here is the experimental setup developed on the PSICHE beamline at SOLEIL to perform high-speed XCT in the Ultra-fast Tomography Paris–Edinburgh cell (UToPEc). The UToPEc is a compact panoramic (165° angular aperture) press optimized for fast tomography that can access 10 GPa and 1700°C. It is installed on a high-speed rotation stage (up to 360° s−1) and allows the acquisition of a full computed tomography (CT) image with micrometre spatial resolution within a second. This marks a major technical breakthrough for time-lapse XCT and the real-time visualization of evolving dynamic systems. In this paper, a practical step-by-step guide to the use of the technique is provided, from the collection of CT images and their reconstruction to performing quantitative analysis, while accounting for the constraints imposed by high-pressure and high-temperature experimentation. The tomographic series allows the tracking of key topological parameters such as phase fractions from 3D volumetric data, and also the evolution of morphological properties (e.g. volume, flatness, dip) of each selected entity. The potential of this 4D tomography is illustrated by percolation experiments of carbonate melts within solid silicates, relevant for magma transfers in the Earth's mantle.

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Effect of the number of projections in X-ray CT imaging on image quality and digital volume correlation measurement

et al. 2022

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A Phase Field Approach to Limited-angle Tomographic Reconstruction

Cited by 4 publications

References 18 publications

In situ tomographic study of a 3D-woven SiC/SiC composite part subjected to severe thermo-mechanical loads

In situ tomographic study of a 3D-woven SiC/SiC composite part subjected to severe thermo-mechanical loads

Quantitative 4D X-ray microtomography under extreme conditions: a case study on magma migration

Effect of the number of projections in X-ray CT imaging on image quality and digital volume correlation measurement

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