Letteratura scientifica selezionata sul tema "In Situ X Ray Nano Tomography"
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Articoli di riviste sul tema "In Situ X Ray Nano Tomography":
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Vanpeene, Victor, Isaac Martens, Jakub Drnec, Tobias Schulli, Ennio Capria e Julie Villanova. "In Situ X-Ray Nano-Tomography at ID16B: A Practical Guide to Battery Analysis". ECS Meeting Abstracts MA2022-01, n. 1 (7 luglio 2022): 119. http://dx.doi.org/10.1149/ma2022-011119mtgabs.
Abstract (sommario):
The past decade faced with rapid development of electric vehicles, portable electronic devices and green energy production, in which lithium-ion batteries (LiBs) technology plays a key role. In this context, extensive research has been made for increasing their energy density along with power density. This challenge requires pushing forward the resolution limits to probe degradation phenomena occurring at the active material level for a deeper understanding of the batter failure mechanism. In this context, X-ray techniques have been intensively used to probe in details the morphological/chemical evolution along cycling of various battery materials. For instance, X-ray computed tomography brings valuable 3D information for material structural analysis at scale ranging from the micrometre to the nanometre. High flux and high coherent X-ray nano-beams provided by the synchrotron sources, combined with the fast acquisition obtained thanks to the new generation of cMOS detectors, make it possible to carry out in situ and operando measurements at the nano-scale to 3D monitor dynamic phenomena. These developments present a real interest for the energy storage applications. This presentation will focus on the hard X-ray nano-tomography set-up developed at the ID16B beamline of the ESRF and its applications toward operando measurements applied to different case studies related to energy materials. This will be discussed as well in regards to the benefits and limitations brought by the extremely brilliant X-ray source EBS developed at the ESRF.
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Antonelli, Stephen, Arthur Ronne, Insung Han, Mingyuan Ge, Bobby Layne, Ashwin J. Shahani, Kazuhiro Iwamatsu et al. "Versatile compact heater design for in situ nano-tomography by transmission X-ray microscopy". Journal of Synchrotron Radiation 27, n. 3 (16 aprile 2020): 746–52. http://dx.doi.org/10.1107/s1600577520004567.
Abstract (sommario):
A versatile, compact heater designed at National Synchrotron Light Source-II for in situ X-ray nano-imaging in a full-field transmission X-ray microscope is presented. Heater design for nano-imaging is challenging, combining tight spatial constraints with stringent design requirements for the temperature range and stability. Finite-element modeling and analytical calculations were used to determine the heater design parameters. Performance tests demonstrated reliable and stable performance, including maintaining the exterior casing close to room temperature while the heater is operating at above 1100°C, a homogenous heating zone and small temperature fluctuations. Two scientific experiments are presented to demonstrate the heater capabilities: (i) in situ 3D nano-tomography including a study of metal dealloying in a liquid molten salt extreme environment, and (ii) a study of pore formation in icosahedral quasicrystals. The progression of structural changes in both studies were clearly resolved in 3D, showing that the new heater enables powerful capabilities to directly visualize and quantify 3D morphological evolution of materials under real conditions by X-ray nano-imaging at elevated temperature during synthesis, fabrication and operation processes. This heater design concept can be applied to other applications where a precise, compact heater design is required.
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Daemi, S. R., X. Lu, D. Sykes, J. Behnsen, C. Tan, A. Palacios-Padros, J. Cookson et al. "4D visualisation of in situ nano-compression of Li-ion cathode materials to mimic early stage calendering". Materials Horizons 6, n. 3 (2019): 612–17. http://dx.doi.org/10.1039/c8mh01533c.
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Costa, G. S. R., G. J. Q. Vasconcelos e N. L. Archilha. "Fluid Injection System for X-ray Tomography Experiments". Journal of Physics: Conference Series 2380, n. 1 (1 dicembre 2022): 012110. http://dx.doi.org/10.1088/1742-6596/2380/1/012110.
Abstract (sommario):
Abstract Due to recent developments on synchrotron sources, time-resolved experiments are favored by fourth-generation machines. In particular, X-ray tomography beamlines can now perform complete experiments in less than one second. MOGNO, the nano and microtomography beamline at Sirius, is designed for in situ and operando experiments. The first designed and tested environmental cell is a complete injection system for porous media materials. This system is composed by a flow cell with fluid injection control and pressure feedback. The cell can be used for experiments with pore pressure up to 750 PSI. To increase the autonomy of the injection system, three syringe pumps with a volume of 15 ml are used, and the flow control is done through three independent step motors, and can vary between 30 to 10,000 µl/minute. A web application was developed to allow MOGNO users to easily control the system and read the pressure feedback.
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Liu, Xiaoyang, Kaustubh Bawane, Yang Liu, Mingyuan Ge, Xiaoyin Zheng, Arthur Ronne, Anna Plonka et al. "Revealing 3D Morphological Evolution and Reaction Kinetics of Metals and Alloys in Molten Salts Via Synchrotron X-Ray Nano-Tomography and Multimodal Studies". ECS Meeting Abstracts MA2022-02, n. 55 (9 ottobre 2022): 2057. http://dx.doi.org/10.1149/ma2022-02552057mtgabs.
Abstract (sommario):
The use of molten salts for large-scale solar concentrated power plants and molten salt reactors has been driving the research to better understand how metals and alloys interact with the molten salt. As the metals may undergo morphological, chemical, and structural change in molten salt environments, it is critical to understand the fundamental mechanisms in these changes. In this work, we will present how we utilized synchrotron X-ray nano-tomography to better understand the 3D morphological evolution of Ni, Cr, and their alloys in molten salt. The effects of temperature and additives in the salt on the morphological evolution will be discussed. At the higher temperature, a characteristic bicontinuous structure can form from molten salt dealloying a binary alloy. [1] This contrasts to the intergranular corrosion found in the same system reacted at a lower temperature. [2] Different additives in the salt were also found to alter the morphological changes of the alloys and can create planar corrosion, percolation dealloying, or redeposition. To complement the morphological studies by X-ray nano-tomography, a suite of X-ray and electron microscopy analyses were also carried out to better understand the chemical and structural (both short-and long-range ordering) evolution. Taking it as a multimodal approach, we will discuss how we couple the analysis from synchrotron operando X-ray absorption spectroscopy, diffraction, and imaging, as well as the multiscale imaging studies from both X-ray and electron microscopy. This work was supported as part of the Molten Salts in Extreme Environments (MSEE) Energy Frontier Research Center (EFRC), funded by the U.S. Department of Energy, Office of Science. References: [1] "Formation of three-dimensional bicontinuous structures via molten salt dealloying studied in real-time by in situ synchrotron X-ray nano-tomography" Xiaoyang Liu, Arthur Ronne*, Lin-Chieh Yu, Yang Liu, Mingyuan Ge, Cheng-Hung Lin, Bobby Layne, Phillip Halstenberg, Dmitry S. Maltsev, Alexander S. Ivanov, Stephen Antonelli, Sheng Dai, Wah-Keat Lee, Shannon M. Mahurin, Anatoly I. Frenkel, James F. Wishart, Xianghui Xiao & Yu-chen Karen Chen-Wiegart* Nature Communications (2021), DOI: 10.1038/s41467-021-23598-8 [2] "Visualizing time-dependent microstructural and chemical evolution during molten salt corrosion of Ni-20Cr model alloy using correlative quasi in situ TEM and in situ synchrotron X-ray nano-tomography" Kaustubh Bawane, Xiaoyang Liu, Ruchi Gakhar, Michael Woods, Mingyuan Ge, Xianghui Xiao, Wah-Keat Lee, Philip Halstenberg, Sheng Dai, Shannon Mahurin, Simon M. Pimblott, James F. Wishart, Yu-chen Karen Chen-Wiegart*, Lingfeng He* Corrosion Science (2021), DOI: 10.1016/j.corsci.2021.109962
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Shapovalov, Viktor, Kristina Kutukova, Sebastian Maletti, Christian Heubner, Vera Butova, Igor Shukaev, Alexander Guda, Alexander Soldatov e Ehrenfried Zschech. "Laboratory X-ray Microscopy Study of Microcrack Evolution in a Novel Sodium Iron Titanate-Based Cathode Material for Li-Ion Batteries". Crystals 12, n. 1 (21 dicembre 2021): 3. http://dx.doi.org/10.3390/cryst12010003.
Abstract (sommario):
The long-term performance of batteries depends strongly on the 3D morphology of electrode materials. Morphological changes, i.e., particle fracture and surface deterioration, are among the most prominent sources of electrode degradation. A profound understanding of the fracture mechanics of electrode materials in micro- and nanoscale dimensions requires the use of advanced in situ and operando techniques. In this paper, we demonstrate the capabilities of laboratory X-ray microscopy and nano X-ray computed tomography (nano-XCT) for the non-destructive study of the electrode material’s 3D morphology and defects, such as microcracks, at sub-micron resolution. We investigate the morphology of Na0.9Fe0.45Ti1.55O4 sodium iron titanate (NFTO) cathode material in Li-ion batteries using laboratory-based in situ and operando X-ray microscopy. The impact of the morphology on the degradation of battery materials, particularly the size- and density-dependence of the fracture behavior of the particles, is revealed based on a semi-quantitative analysis of the formation and propagation of microcracks in particles. Finally, we discuss design concepts of the operando cells for the study of electrochemical processes.
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Chen, Liang, Lihui Wu, Yu Liu e Wei Chen. "In situ observation of void evolution in 1,3,5-triamino-2,4,6-trinitrobenzene under compression by synchrotron radiation X-ray nano-computed tomography". Journal of Synchrotron Radiation 27, n. 1 (1 gennaio 2020): 127–33. http://dx.doi.org/10.1107/s1600577519014309.
Abstract (sommario):
The formation and development of voids in 1,3,5-triamino-2,4,6-trinitrobenzene crystals under compression were characterized in situ by X-ray nano-computed tomography. Benefiting from high spatial resolution (30 nm) and excellent imaging contrast, the X-ray nano-computed tomography images revealed the presence of a small fraction of inhomogeneous structures in the original crystal (volume ratio ∼1.2%). Such an inhomogeneity acts as a nucleation of voids and produces stress concentration during compression, which leads to continuous growth of the voids under loading. Meanwhile, the results further reveal that the developing voids are not isotropic: voids with higher surface roughness and irregular structures are easier to break and form new micro-voids. These new voids with higher irregular structures are weaker and easier to break into smaller ones compared with the originals, leading to the development of voids along these weak zones. Finally large voids form. The experiments allow direct investigation of void formation and development, which helps in studying the mechanisms of void development and energetic materials deterioration during manufacturing and transporting.
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Schmid, Gregor, Fabian Zeitvogel, Likai Hao, Pablo Ingino, Wolfgang Kuerner, James J. Dynes, Chithra Karunakaran et al. "Synchrotron-Based Chemical Nano-Tomography of Microbial Cell-Mineral Aggregates in their Natural, Hydrated State". Microscopy and Microanalysis 20, n. 2 (19 febbraio 2014): 531–36. http://dx.doi.org/10.1017/s1431927613014104.
Abstract (sommario):
AbstractChemical nano-tomography of microbial cells in their natural, hydrated state provides direct evidence of metabolic and chemical processes. Cells of the nitrate-reducing Acidovorax sp. strain BoFeN1 were cultured in the presence of ferrous iron. Bacterial reduction of nitrate causes precipitation of Fe(III)-(oxyhydr)oxides in the periplasm and in direct vicinity of the cells. Nanoliter aliquots of cell-suspension were injected into custom-designed sample holders wherein polyimide membranes collapse around the cells by capillary forces. The immobilized, hydrated cells were analyzed by synchrotron-based scanning transmission X-ray microscopy in combination with angle-scan tomography. This approach provides three-dimensional (3D) maps of the chemical species in the sample by employing their intrinsic near-edge X-ray absorption properties. The cells were scanned through the focus of a monochromatic soft X-ray beam at different, chemically specific X-ray energies to acquire projection images of their corresponding X-ray absorbance. Based on these images, chemical composition maps were then calculated. Acquiring projections at different tilt angles allowed for 3D reconstruction of the chemical composition. Our approach allows for 3D chemical mapping of hydrated samples and thus provides direct evidence for the localization of metabolic and chemical processes in situ.
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Parks, Huw Christopher William, Aaron Wade, Thomas M. M. Heenan, Chun Tan, Alice V. Llewellyn, Hamish Thomas Reid, Ralf Ziesche et al. "Crack Hysteresis Phenomena in Polycrystalline NMC811 Secondary Particles". ECS Meeting Abstracts MA2023-01, n. 7 (28 agosto 2023): 2847. http://dx.doi.org/10.1149/ma2023-0172847mtgabs.
Abstract (sommario):
Using X-ray tomography, we can predict and study the factors that govern fracture behaviour and cracking in NMC811 particles as a function of potential. Cracking and fracturing is known to cause a decline in battery performance, as regions become disintegrated from the conductive matrix. However, electrochemically induced cracking can be difficult to assess due to complicated sample preparation methods required. An in-situ study that accurately determines the onset of cracking during delithiation from the layered structure is crucial to characterize voltage-induced fracturing in battery particles. Tomography has been extensively used to non-destructively image cracks in li-ion battery materials at the electrode and particle level, making it an ideal candidate for in-situ studies that preserve the electrode during charging and discharging. However, accurately, and reliably tracking operational cracking without the influence of pre-existing cracks is highly challenging, requiring the highest resolutions possible for 3D imaging techniques and small sample geometries while maintaining realistic electrochemical performance. In this study, we present a technique using in-situ synchrotron X-ray computed tomography (CT) and nano-scale CT to completely attribute particle cracking to electrochemical stimulation, corroborated with high-resolution imaging. We demonstrate the cracking hysteresis phenomenon that occurs in NMC811 secondary particles during the first cycle, using a rapid detection algorithm that calculates the extent of cracking in battery particles, even when cracking is not resolvable as compared to nano CT. The results show unprecedented material statistics for understanding and predicting fracture behaviour in battery particles. Figure 1
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Parks, Huw Christopher William, Chun Tan, Aaron Wade, Thomas M. M. Heenan, Paul R. Shearing, Dan Brett e Rhodri Jervis. "Nano Tomography of High Voltage Induced First Cycle Cracking in NMC811". ECS Meeting Abstracts MA2022-01, n. 2 (7 luglio 2022): 345. http://dx.doi.org/10.1149/ma2022-012345mtgabs.
Abstract (sommario):
Lithium nickel-manganese-cobalt (NMC) oxide-based Li-ion batteries have emerged as the most promising successor to LiCoO2 chemistry and could potentially facilitate ubiquitous adoption of Li-ion in mobile and transport systems. High specific capacities, high-rate capability, and long-term cycling abilities are driving much research into these cathode materials, forcing a greater nickel content with each iteration. NMC811’s high specific capacity makes it highly attractive for battery suppliers and users; however, it suffers significant capacity fade via several degradation modes, one being crack formation within secondary particles. The fresh surface exposed by cracking has been linked with parasitic reactions that evolve oxygen and potentially initiate the formation of inactive crystal structures. [1] X-ray computed tomography (CT) has been utilised extensively to image the morphology of battery particles and with the advancement of lab-based tomography systems, resolution on the nano scale is readily available.[2] Whilst in-situ studies are becoming the standard experimental operation for appraising the dynamic nature of these materials, in-situ cells are complicated for use in lab-based instruments due to their low flux, low energy and reduced working space. Thus, nano tomography rarely provides information that deconvolutes chemo-mechanical cracking from manufacturing defects and calendaring. However, in this work we have developed a unique technique to follow the progression of cracking at the nanometre scale by sequential correlated imaging of a micro-sized tab cut from the electrode.[3,4] This method allows for images of the pristine material to be acquired ex-situ before electrochemical testing, and then sequential imaging of the same region of interest in subsequent scans. Here, nano-CT imaging of the same region of the electrode while fully-lithiated and charged to 4.5 V unveils the propagation of cracks as a function of voltage, and their relaxation phenomena upon discharge. [1] Li, Tianyu, Xiao-Zi Yuan, Lei Zhang, Datong Song, Kaiyuan Shi, and Christina Bock. "Degradation mechanisms and mitigation strategies of nickel-rich NMC-based lithium-ion batteries." Electrochemical Energy Reviews 3, no. 1 (2020): 43-80. [2] Heenan, Thomas MM, Chun Tan, Jennifer Hack, Dan JL Brett, and Paul R. Shearing. "Developments in X-ray tomography characterization for electrochemical devices." Materials Today 31 (2019): 69-85 [3] Tan, C., S. Daemi, T. Heenan, F. Iacoviello, A. S. Leach, L. Rasha, R. Jervis, D. J. L. Brett, and P. R. Shearing. "Rapid preparation of geometrically optimal battery electrode samples for nano scale X-ray characterisation." Journal of The Electrochemical Society 167, no. 6 (2020): 060512. [4] Tan, Chun, Andrew S. Leach, Thomas MM Heenan, Huw Parks, Rhodri Jervis, Johanna Nelson Weker, Daniel JL Brett, and Paul R. Shearing. "Nanoscale state-of-charge heterogeneities within polycrystalline nickel-rich layered oxide cathode materials." Cell Reports Physical Science (2021): 100647. Figure 1
Tesi sul tema "In Situ X Ray Nano Tomography":
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Harrup, Gutierrez Anthony Albert. "Evolution des dommages lors du traitement thermomécanique de plaques épaisses d'aluminium aérospatial". Electronic Thesis or Diss., Université Grenoble Alpes, 2024. http://www.theses.fr/2024GRALI019.
Abstract (sommario):
Les alliages d'aluminium avancés utilisés dans l'industrie aérospatiale nécessitent des propriétés de haute performance telles que la ténacité à la fracture, la résistance à la fatigue et la résistance à la corrosion. L'AA2050 est un alliage d'aluminium largement utilisé pour les composants de structure interne aérospatiale en raison de ses hautes propriétés mécaniques combinées à sa faible densité. Durant le processus de fabrication, les alliages d'aluminium subissent diverses étapes thermomécaniques, telles que le laminage à chaud. En particulier, le laminage à chaud permet de fermer la porosité de ségrégation qui peut se former lors de la coulée. Explorer de nouvelles fenêtres de processus pour ce procédé peut conduire à des conditions extrêmes où le comportement des pores n'est pas bien connu. L'objectif principal de ce travail est de comprendre comment les pores peuvent germer et croître sous des déformations à chaud en traction représentatives de ces conditions de laminage à chaud extrêmes.Dans ce travail, nous avons étudié la germination et la croissance des pores sous différentes conditions thermomécaniques dans l'AA2050 pour imiter les dommages lors du laminage à chaud de plaques épaisses. La partie centrale de cette étude a consisté à utiliser la tomographie aux rayons X multi-échelles réalisée au European Synchrotron Radiation Facility (ESRF). La méthodologie consistait à effectuer une nano-tomographie synchrotron aux rayons X in situ lors de tests de traction micrométriques à haute température et une micro-tomographie synchrotron aux rayons X ex situ de Tests de Traction Secondaires. Des analyses SEM et EBSD ont également été effectuées sur des échantillons de traction micrométriques post-mortem.Avec la nano-tomographie aux rayons X, nous avons observé la germination et l'évolution des pores à trois températures différentes (400°C, 440°C et 480°C). Les pores ont été segmentés et mesurés en termes de volume et de morphologie, ainsi que les intermétalliques et les précipités les entourant. Avec cela, une classification des pores en fonction de leur lieu de germination est proposée.En utilisant des algorithmes de Corrélation de Volume Numérique (DVC), nous avons suivi l'évolution de centaines de pores individuels pour déterminer leur croissance en lien avec la déformation locale à l'intérieur des échantillons. En couplant l'évolution des pores et les données de contrainte locale avec des simulations de Méthode des Éléments Finis de tests de traction à haute température, nous avons déterminé le champ de contrainte local et comparé nos résultats expérimentaux avec cinq modèles existants d'évolution des vides. Les prédictions des modèles sont discutées.Pour relier le comportement du matériau et l'évolution de la porosité à une échelle plus grande, nous avons mené des Tests de Traction Secondaires ex situ. En utilisant le logiciel DVC PT4D, nous avons extrait le champ de déformation des images 3D obtenues, corroborant le comportement du matériau à différentes températures. Cette étude améliore non seulement notre compréhension du comportement de l'AA2050 dans des conditions extrêmes, mais fournit également des informations précieuses sur la formation de défauts dans les processus thermomécaniques avancésAdvanced aluminium alloys used in the aerospace industry require high performance properties such as fracture toughness, fatigue resistance, and corrosion resistance. AA2050 is an aluminium alloy widely used for aerospace internal structure components because of its high mechanical properties combined with its low density. During the manufacturing process of aluminium alloys undergo various thermomechanical steps, such as hot rolling. In particular, hot-rolling enables to close the segregation porosity that may form during casting. Exploring new process windows for this process may lead to extreme conditions where pore behaviour is not well known. The main objective of this work is to understand how pores may nucleate and grow under hot tensile deformations representative of these extreme hot rolling conditions.In this work, we studied pore nucleation and growth under different thermo-mechanical conditions in AA2050 to mimic damage during hot rolling of thick plates. The central part of this study involved multi-scale X-ray tomography performed at the European Synchrotron Radiation Facility (ESRF). The methodology consisted in performing in situ synchrotron X-ray nano-tomography during high-temperature micrometric tensile tests and ex situ synchrotron X-ray micro-tomography of Secondary Tensile Tests. SEM and EBSD analysis were also performed on post-mortem micrometric tensile specimens.With X-ray nano-tomography, we observed the nucleation and evolution of pores at three different temperatures (400°C, 440°C, and 480°C). The pores were segmented and measured in terms of volume and morphology, along with the intermetallics and precipitates surrounding them. With this, a classification of the pores depending on their nucleation location is proposed.Using Digital Volume Correlation (DVC) algorithms, we tracked the evolution of hundreds of individual pores, learning about their growth behaviour and measuring local strain within the specimens. By coupling pore evolution and local strain data with Finite Element Method simulations of high-temperature tensile tests, we determined the local stress field and compared our experimental results with five existing void evolution models. Model predictions are discussed.To link material behaviour and porosity evolution on a larger scale, we conducted ex situ Secondary Tensile Tests. Using the DVC software PT4D, we extracted the strain field from the obtained 3D images, corroborating the material's behaviour at different temperatures. This study not only enhances our understanding of AA2050's behaviour under extreme conditions but also provides valuable insights into defect formation in advanced thermo-mechanical processes
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Acito, Vito. "In situ X-ray computed tomography for soft contact mechanics". Electronic Thesis or Diss., Ecully, Ecole centrale de Lyon, 2023. http://www.theses.fr/2023ECDL0054.
Abstract (sommario):
L'aire de contact réelle AR entre deux solides en contact est une quantité fondamentale qui contrôle le comportement de frottement d'une interface de contact. Bien que la plupart des techniques expérimentales visant à mesurer cette quantité soient basées sur le contraste optique entre les régions en contact et hors contact, ces méthodes sont limitées par la transparence optique requise par au moins l'un des deux corps en contact. En outre, ces techniques ne permettent d'accéder qu'à l'interface de contact sans fournir d'informations sur d'autres quantités physiques importantes telles que la déformation globale ou les phénomènes hors contact à la surface. À partir de quelques travaux pionniers, nous proposons la tomographie à rayons X (XRCT) in-situ comme méthode alternative pour surmonter ces limites et accéder à la morphologie complète du contact en 3D avec des paires de contacts potentiellement non transparentes. Dans toutes les études précédentes, les analyses ont été effectuées sur des surfaces complexes sans se concentrer sur des examens préliminaires des limites de la XRCT (comme l'estimation des erreurs dans la mesure de AR). Dans ce cadre, nous avons proposé l'utilisation d'un système modèle composé d'une sphère lisse en élastomère (PDMS) et d'une plaque rigide lisse (en PMMA) pour simplifier le problème et souligner les avantages et les inconvénients de cette méthode expérimentale. Nous nous sommes d'abord concentré sur la mesure in-situ de l'évolution de AR au cours d'un essai de compression et de cisaillement réalisé sur notre système modèle. Les résultats ont été comparés à ceux d'un dispositif opto-mécanique 2D déjà maîtrisé. Enfin, à partir de la reconstruction en 3D in-operando du contact modéle indenté cisaillé, nous avons pu extraire les champ de déplacement, déformation et contraintes dans le contact par corrélation numérique des volumes (DVC) en utilisant comme marqueurs des particules préalablement dispersés dans le PDMS. Tous ces résultats ont été mis en regard des prédictions théoriques de modèles de la littératureThe real contact area AR between two solids in contact is a fundamental quantity that controls the frictional behavior of a contact interface. Although most experimental techniques aimed at measuring this quantity are based on the optical contrast between in-contact and out-of-contact regions, these methods are limited by the optical transparency required for least one of the two contacting bodies. Furthermore, these techniques only provide access to the contact interface without providing information on other important physical quantities such as the global deformation or the out-of-contact phenomena at the surface. Building on some pioneering work, we propose in-situ X-ray tomography (XRCT) as an alternative method to overcome these limitations and access the full 3D contact morphology with potentially non-transparent contact pairs. In all previous studies, analyzes were performed on complex surfaces without focusing on preliminary examinations of the limitations of XRCT (such as estimating errors in measuring AR). In this context, we proposed the use of a model system composed of a smooth elastomer sphere (PDMS) and a smooth rigid plate (PMMA) to simplify the problem and highlight the advantages and disadvantages of this experimental method. We first focused on measuring in-situ the evolution of AR during a compression and shear test carried out on our model system. The results were compared to those of a 2D opto-mechanical device already mastered. Finally, from the in-operando 3D reconstruction of the indented and sheared contact , we were able to extract the displacement, deformation and stress fields in the contact by digital correlation of volumes (DVC) using as markers particles previously dispersed in PDMS. All these results were compared to theoretical predictions from models in the literature
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Ando, Edward. "Experimental investigation of microstructural changes in deforming granular media using x-ray tomography". Thesis, Grenoble, 2013. http://www.theses.fr/2013GRENI097/document.
Abstract (sommario):
Cette thèse présente un travail expérimental dans le domaine de la mécanique des milieux granulaires.Ce travail introduit une nouveauté fondamentale: durant la déformation d’échantillonsde sable en compression triaxiale classique, leur micro-structure est enregistrée par tomographieà rayons-x en environ 15 étapes de déformation différentes.Afin que tous les grains d’un échantillon soient individuellement visibles dans les imagesde tomographie, les échantillons sont considérablement réduits pour qu’ils mesurent 11 mm endiamètre et 22 mm en hauteur. Cela permet d’identifier et d’individualiser tous les plus decinquante mille grains d’un échantillon.Dans ce travail expérimental, une série d’essais triaxiaux a été réalisée sur trois sables naturels(le sable d’Hostun, le sable d’Ottawa et des Caicos ooids, tous à partir des états initiauxrelativement denses), à deux valeurs de pression de confinement différents (100 et 300 kPa).Dans les images 3D résultantes de la reconstruction des acquisitions tomographiques réaliséesau cours de chaque essai, les grains sont identifiés dans chaque état en utilisant un algorithmede type watershed (ligne de partage des eaux) classique. À partir de ces données discrétisées,des techniques ont été mises au point pour caractériser les contacts grain-à-grain mais aussipour mesurer la cinématique de tous les grains identifiés entre les états pour lesquels des imagestridimensionnelles existent. La cinématique des grains est mesurée avec deux outils spécialementdéveloppés: “ID-Track” suit les grains et donne leurs déplacements; cette information est ensuitenécessaire pour une technique hybride de corrélation d’images discrète pour mesurer la rotationde chaque grain.Des mesures à l’échelle du grain sont présentées en détail pour un essai, et sont ensuitecomparées à des essais dans des conditions différentes. L’objectif est de mettre en évidence lesmicro-mécanismes responsables des différents comportements macroscopiques observés pour cesmatériaux. Cette comparaison met en évidence certains micro-mécanismes importants tels que,par exemple, la déformation d’un échantillon. Celle-ci est concentrée dans une bande de cisaillementbien développée qui correspond à une bande de grains avec des rotations intenses. Dans unéchantillon de grains arrondis, cette bande – définie par des grains – est très nette. Par contre,avec des grains anguleux, les rotations des grains dans la bande “polluent” les grains voisins;leur forme facilite l’engrenage entre grains, qui limite aussi les grosses rotations individuelles desgrains. Cette différence de mécanisme de déformation est utilisée pour expliquer la différencedans la contrainte résiduelle observée à macro-échelle. Des signes de déformation localisée sontsystématiquement observés en train de se produire avant le pic de déformation des échantillons etdes systèmes complexes de chaînes de rotations de grains (qui correspondent aussi à une mesurelocale de déformation calculée avec les déplacements des grains) sont remarquées autour du picde la réponse macroscopique de chaque échantillonThis doctoral thesis presents an experimental investigation into the mechanics of granular media.The novelty that this work brings is that the specimens of sand tested in this work are systematicallyand non-destructively imaged using x-ray tomography. Sample size is considerably reducedfrom standard (specimens measure approximately 22 mm height by 11 mm diameter), allowingentire specimens to be scanned at a sufficiently high resolution to identify all the grains (morethan fifty thousand) in each specimen.A campaign of triaxial compression tests has been run on a series of three different naturalsands with different grain shapes (Hostun sand, Ottawa sand and Caicos ooids – all prepared atrelatively dense initial states), and tested at 100 or 300 kPa cell pressure. In each test around 15x-ray scans are performed. In the 3D images resulting from the reconstruction of the x-ray scansperformed, grains are identified each state using a standard watershed algorithm. Starting fromthese discretised data, techniques are developed in order characterise grain-to-grain contacts,as well as to measure the kinematics of all the identified grains between imaged states. Grainkinematics are measured with two specifically-developed tools: “ID-Track” to track grains yieldingtheir displacements, and a discrete image correlation technique to measure grain rotations.Grain-scale measurements are reported in detail for one test, and are then compared to testsin different conditions, in order to highlight the micro-mechanisms responsible for the observedmacroscopic behaviour. This comparison highlights some important micro-scale mechanisms suchas the increasing rotational frustration of more angular grains when the sample’s deformation isconcentrated in a fully developed shear band; this is used to explain to some extent the highervalue of their residual stress for these materials. Signs of localised deformation are seen to occurwell before the peak in many samples, and complex patterns of rotating grains (which match alocal, grain-based measurement of strain) are noticed around the peak of each sample’s response
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Ren, Wenyuan. "In-situ X-ray computed tomography characterisation and mesoscale image based fracture modelling of concrete". Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/insitu-xray-computed-tomography-characterisation-and-mesoscale-image-based-fracture-modelling-of-concrete(3307ca0b-b492-4bfc-91f7-61c092b21707).html.
Abstract (sommario):
This study develops a 3D meso-scale fracture characterisation and modelling framework for better understanding of the failure mechanisms in concrete, by combining in-situ micro-scale X-ray computed tomography (XCT) experiments and XCT image-based finite element (FE) simulations. Firstly, sophisticated in-situ XCT experiments are conducted on concrete cubes under Brazilian-like, uniaxial and cyclic compression. Proper procedures for XCT image reconstruction and multi-phasic segmentation are identified. The fracture evolution at different loading stages is characterised and visualised as well as the detailed distributions of aggregates and voids. The Young's moduli of aggregate and cement are obtained by micro-indentation tests and used in XCT-image based asymptotic homogenisation simulations to calculate effective elastic constants of concrete cubes. The XCT technique proves very powerful in characterising and visualising the complicated 3D fracture evolution in concrete. The material properties and the segmented 3D images from the experiments are then used for FE fracture simulations with realistic aggregates, cement and voids. Image-based mesh generation algorithms are developed for 2D in a MATLAB code and identified for 3D in Simpleware. Cohesive interface elements are embedded within cement and aggregate-cement interfaces to simulate the complex nonlinear fracture. Extensive simulations of 40mm and 20mm cubes under compression and tension are carried out. Good agreements are achieved between the load-displacement curves and final crack patterns from the simulations and those from the compressive in-situ XCT tests. The XCT image-based modelling proves very promising in elucidating fundamental mechanisms of complicated crack initiation and propagation in concrete.
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Lalechos, Antonios V. "Evaluation of X-ray CT tomography as a means for investigating in-situ electrical contact interfaces". Thesis, University of Southampton, 2010. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.536365.
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Qsymah, Ansam. "In-situ X-ray computed tomography tests and numerical modelling of ultra high performance fibre reinforced concrete". Thesis, University of Manchester, 2016. https://www.research.manchester.ac.uk/portal/en/theses/insitu-xray-computed-tomography-tests-and-numerical-modelling-of-ultra-high-performance-fibre-reinforced-concrete(7c27ef36-afc8-4ea7-8c72-7d92eba924f9).html.
Abstract (sommario):
Ultra high performance fibre reinforced concrete (UHPFRC) is a relatively new fibre reinforced cementitious composite and has become very popular in construction applications. Extensive experimental studies have been conducted, demonstrating its superior properties such as much higher strength, ductility and durability than conventional fibre reinforced concrete (FRC) and high performance concrete. However, the material's damage and fracture mechanisms at meso/micro scales are not well understood, limiting its wider applications considerably. This study aims at an in-depth understanding of the damage and fracture mechanisms of UHPFRC, combining microscale in-situ X-ray computed tomography (µXCT) experiments and mesoscale image-based numerical modelling. Firstly, in-situ µXCT tests of small-sized UHPFRC specimens under wedge splitting loading were carried out, probably for the first time in the world, using an in-house designed loading rig. With a voxel resolution of 16.9µm, the complicated fracture mechanisms are clearly visualised and characterised using both 2D images and 3D volumes at progressive loading stages, such as initiating of micro-cracks, arresting of cracks by fibres, bending and pulling out of fibres and spalling of mortar at the exit points of inclined fibres. Secondly, based on the statistics of pores in the µXCT images obtained for a 20mm cube specimen, an efficient two-scale analytical-numerical homogenisation method was developed to predict the effective elastic properties of the UHPFRC. The large number of small pores were first homogenised at microscale with sand and cement paste, using elastic moduli from micro-indentation tests. 3D mesoscale finite element models were built at the second scale by direct conversion of the µXCT images, with fibres and large pores were faithfully represented. The effects of the volume fraction and the orientation of steel fibres on the elastic modulus were investigated, indicating that this method can be used to optimise the material micro-structure. Thirdly, 3D mesoscale finite element models were built for the specimen used in the in-situ µXCT wedge splitting test, with embedded fibre elements directly converted from the µXCT images. The fracture behaviour in the mortar was simulated by the damage plasticity model available in ABAQUS. Finally, 2D mesoscale finite element models were developed to simulate the fracture behaviour of UHPFRC using cohesive interface elements to simulate cracks in the mortar, and randomly distributed two-noded 1D fibres and connector elements to simulate the pull-out behaviour of fibres. This approach offers a link between the fibres pull-out behaviour and the response of the whole composite at the macroscale, thus it can be used to conduct parametric studies to optimise the material properties.
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Wheatland, Jonathan Antony Thomas. "Characterising the multi-scale properties of flocculated sediment by X-ray and focused ion beam nano-tomography". Thesis, Queen Mary, University of London, 2017. http://qmro.qmul.ac.uk/xmlui/handle/123456789/25984.
Abstract (sommario):
The hydrodynamic behaviour of fine suspended aqueous sediments, and stability of the bedforms they create once settled, are governed by the physical properties (e.g., size, shape, porosity and density) of the flocculated particles in suspension (flocs). Consequently, accurate prediction of the transport and fate of sediments and of the nutrients and pollutants they carry depends on our ability to characterise aqueous flocs. Current research primarily focuses on characterising flocs based on their external gross-scale (>1 μm) properties (e.g., gross morphology, size and settling velocity) using in situ techniques such as photography and videography. Whilst these techniques provide valuable information regarding the outward behaviour of flocculated sediment (i.e. transport and settling), difficulties associated with extracting 3D geometries from 2D projections raises concerns regarding their accuracy and key parameters such as density can only be estimated. In addition, they neglect to inform on the internal micro- and nano-scale structure of flocs, responsible for much of their behaviour and development. Transmission electron microscope (TEM) and environmental electron microscope may be used to obtain nano-scale information in, essentially, 2D but there is a large scale gap between this information and the macro-scale of optical techniques. To address this issue this study uses 3D tomographic imaging over a range of spatial scales. Whilst commonly used in materials science and the life sciences, correlative tomography has yet to be applied in the environmental sciences. Threading together 3D Xray micro-computed tomography (X-ray μCT) and focused ion beam nano-tomography (FIBnt) with 2D TEM makes material characterisation from the centimetre to nanometre-scale possible. Here, this correlative imaging strategy is combined with a non-destructive stabilisation procedure and applied to the investigation of flocculated estuarine sediment, enabling the multi length-scale properties of flocs to be accurately described for the first time. This work has demonstrated that delicate aqueous flocs can be successfully stabilised via a resin embedding process and contrasted for both electron microscopy and X-ray tomography imaging. The 3D information obtained can be correlated across all length-scales from nm to mm revealing new information about the structure and morphology of flocs. A new system of characterising floc structure can be defined based on the association of particles and their stability in the structure rather than simply their size. This new model refutes the postulate that floc structures are fractal in nature.
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Costin, Marius. "Multiresolution Image Reconstruction in X-ray Micro- and Nano- Computed Tomography : Application in Materials Non-Destructive Testing". Lyon, INSA, 2010. http://theses.insa-lyon.fr/publication/2010ISAL0034/these.pdf.
Abstract (sommario):
Dans le cadre d'une large coopération internationale, le projet Saphir a comme but principal la production sure, intégrée et contrôlée de produits nano-structurés multifonctionnels. Dans ce contexte, notre contribution consiste à développer une méthode d'imagerie tridimensionnelle pour inspecter et caractériser les échantillons et les pièces fournis par les partenaires du projet. La tomographie par rayonnement X a été choisie car elle constitue une technique adaptée au contrôle non-destructif. Mais pour des échantillons très complexes présentant des détails sur plusieurs ordres de grandeur, les scanners commerciaux ne répondent pas à tous les besoins et une méthode adaptée a du être développée. Cette thèse établit une base théorique et expérimentale pour une méthode originale capable de produire des images multi-résolution et que nous avons nommé ASDIR (Approximate Single Detail Image Reconstruction). Dans une configuration de type « zoom-in », deux jeux de données sont acquis et fusionnés. La reconstruction de ces données combinées est basée sur l'algorithme standard de rétroprojection filtrée (FBP), mais notre méthode est une extension qui implémente une accélération par l'utilisation de la théorie des ondelettes. Deux versions préliminaires sont également présentées : elles produisent des résultats moins satisfaisants et ont servi de base pour la version finale. Une période importante a été consacrée aux expériences ainsi qu'à l'étude et la compréhension des phénomènes physiques intervenant en CT. Des corrections pour les plus importantes sources d'artefacts ont été mises en oeuvre et leur efficacité a été démontré e grâce à la qualité des images obtenues. Nous avons validé notre approche sur des données simulées et expérimentales. Nous avons généré des données simulées avec des fantômes que nous avons spécialement conçus pour évaluer différentes caractéristiques de la méthode et des échantillons. Les données expérimentales ont été acquises avec deux dispositifs différents, un microtomographe et un nanotomographe, et sur des échantillons de tailles différentes. Une étude de métrologie a été menée sur les images produites et des informations sur la porosité des échantillons ont pu être extraitesIn a large international cooperation, the Saphir project aims at producing in a safe, integrated and controlled way, multifunctional nanostructured products. Within this framework, our contribution is the development of a method for three dimensional inspection and characterization of samples and parts produced by the partners. As a starting point, the X-ray computed tomography (CT) was chosen as the most appropriate non-destructive technique. But because the samples are very complex, with features over more orders of magnitude, the available commercial devices could not solve all the requirements and an adapted method for the image reconstruction needed to be developed. This thesis puts a theoretical and an experimental basis for an original method that we abbreviated ASDIR (Approximate Single Detail Image Reconstruction), capable of producing multiresolution images. In a zoom in CT setup, two sets of projections are acquired and combined. The reconstruction is based on the standard filtered backprojection (FBP) algorithm, but we extended it by implementing an acceleration technique that uses a wavelet processing of the data. Two preliminary variants are also presented, which turned out to produce unsatisfactory results, but they were the basis for the final version. We validated our approach on both simulated and experimental data. We generated numerical data with phantoms that we designed specially to assess different features of the method and of the samples. The experimental data was acquired with two different devices, a micro-tomograph and a nano-tomograph, with samples of different sizes. The images that we produced were subject to a basic analysis and we are confident that more information can be extracted from a detailed study
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Cai, Biao. "In situ synchrotron tomographic quantification of semi-solid properties of aluminum-copper alloys". Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/in-situ-synchrotron-tomographic-quantification-of-semisolid-properties-of-aluminumcopper-alloys(60c222d0-7e70-4a1e-9ed4-75b8f559d5de).html.
Abstract (sommario):
Semi-solid deformation mechanisms are important in a range of manufacturing and natural phenomena, which range from squeeze casting to magma flows. In this thesis, using high speed synchrotron X-ray tomography and a bespoke precision thermo-mechanical rig, a four dimensional (3D plus time) quantitative investigation was performed to study the mechanical / rheological behavior of semi-solid Al-Cu alloys. Various deformation techniques, namely, isothermal semi-solid compression, extrusion and indentation were used. The time-resolved dynamic 3D images were analyzed with the help of novel image quantification techniques including digital volume correlation and image-based simulations of fluid flow. The quantified dynamics at a microstructural scale was then linked with macroscopic mechanical properties. The qualitative and quantitative analyses revealed a range of important semi-solid micromechanical mechanisms including the occurrence and effects of dilatancy, associated liquid flow through the equiaxed microstructure, intra-dendritic deformation, and strain localization during semi-solid deformation, not only shedding new insights into the mechanisms of deformation-induced solidification defect formation (solute segregation, porosity and hot tearing) of semi-solid alloys at both a macroscopic and microscopic level, but also providing benchmark cases for semi-solid deformation models and theories. The experimental methodology, techniques and analysis procedures developed in this thesis are generic in nature and can be applied to a wide range of research fields.
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Weber, Loriane. "Iterative tomographic X-Ray phase reconstruction". Thesis, Lyon, 2016. http://www.theses.fr/2016LYSEI085/document.
Abstract (sommario):
L’imagerie par contraste de phase suscite un intérêt croissant dans le domaine biomédical, puisqu’il offre un contraste amélioré par rapport à l’imagerie d’atténuation conventionnelle. En effet, le décalage en phase induit par les tissus mous, dans la gamme d’énergie utilisée en imagerie, est environ mille fois plus important que leur atténuation. Le contraste de phase peut être obtenu, entre autres, en laissant un faisceau de rayons X cohérent se propager librement après avoir traversé un échantillon. Dans ce cas, les signaux obtenus peuvent être modélisés par la diffraction de Fresnel. Le défi de l’imagerie de phase quantitative est de retrouver l’atténuation et l’information de phase de l’objet observé, à partir des motifs diffractés enregistrés à une ou plusieurs distances. Ces deux quantités d’atténuation et de phase, sont entremêlées de manière non-linéaire dans le signal acquis. Dans ces travaux, nous considérons les développements et les applications de la micro- et nanotomographie de phase. D’abord, nous nous sommes intéressés à la reconstruction quantitative de biomatériaux à partir d’une acquisition multi-distance. L’estimation de la phase a été effectuée via une approche mixte, basée sur la linéarisation du modèle de contraste. Elle a été suivie d’une étape de reconstruction tomographique. Nous avons automatisé le processus de reconstruction de phase, permettant ainsi l’analyse d’un grand nombre d’échantillons. Cette méthode a été utilisée pour étudier l’influence de différentes cellules osseuses sur la croissance de l’os. Ensuite, des échantillons d’os humains ont été observés en nanotomographie de phase. Nous avons montré le potentiel d’une telle technique sur l’observation et l’analyse du réseau lacuno-canaliculaire de l’os. Nous avons appliqué des outils existants pour caractériser de manière plus approfondie la minéralisation et les l’orientation des fibres de collagènes de certains échantillons. L’estimation de phase, est, néanmoins, un problème inverse mal posé. Il n’existe pas de méthode de reconstruction générale. Les méthodes existantes sont soit sensibles au bruit basse fréquence, soit exigent des conditions strictes sur l’objet observé. Ainsi, nous considérons le problème inverse joint, qui combine l’estimation de phase et la reconstruction tomographique en une seule étape. Nous avons proposé des algorithmes itératifs innovants qui couplent ces deux étapes dans une seule boucle régularisée. Nous avons considéré un modèle de contraste linéarisé, couplé à un algorithme algébrique de reconstruction tomographique. Ces algorithmes sont testés sur des données simuléesPhase contrast imaging has been of growing interest in the biomedical field, since it provides an enhanced contrast compared to attenuation-based imaging. Actually, the phase shift of the incoming X-ray beam induced by an object can be up to three orders of magnitude higher than its attenuation, particularly for soft tissues in the imaging energy range. Phase contrast can be, among others existing techniques, achieved by letting a coherent X-ray beam freely propagate after the sample. In this case, the obtained and recorded signals can be modeled as Fresnel diffraction patterns. The challenge of quantitative phase imaging is to retrieve, from these diffraction patterns, both the attenuation and the phase information of the imaged object, quantities that are non-linearly entangled in the recorded signal. In this work we consider developments and applications of X-ray phase micro and nano-CT. First, we investigated the reconstruction of seeded bone scaffolds using sed multiple distance phase acquisitions. Phase retrieval is here performed using the mixed approach, based on a linearization of the contrast model, and followed by filtered-back projection. We implemented an automatic version of the phase reconstruction process, to allow for the reconstruction of large sets of samples. The method was applied to bone scaffold data in order to study the influence of different bone cells cultures on bone formation. Then, human bone samples were imaged using phase nano-CT, and the potential of phase nano-imaging to analyze the morphology of the lacuno-canalicular network is shown. We applied existing tools to further characterize the mineralization and the collagen orientation of these samples. Phase retrieval, however, is an ill-posed inverse problem. A general reconstruction method does not exist. Existing methods are either sensitive to low frequency noise, or put stringent requirements on the imaged object. Therefore, we considered the joint inverse problem of combining both phase retrieval and tomographic reconstruction. We proposed an innovative algorithm for this problem, which combines phase retrieval and tomographic reconstruction into a single iterative regularized loop, where a linear phase contrast model is coupled with an algebraic tomographic reconstruction algorithm. This algorithm is applied to numerical simulated data
Capitoli di libri sul tema "In Situ X Ray Nano Tomography":
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Terzi, Sofiane, Rémi Daudin, Julie Villanova, Prakash Srirangam, Pierre Lhuissier, Luc Salvo, Elodie Boller et al. "X-Ray Tomography and Small-Angle Neutron Scattering Characterization of Nano-Composites: Static and In Situ Experiments". In Light Metals 2014, 1389–93. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118888438.ch232.
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Terzi, Sofiane, Rémi Daudin, Julie Villanova, Prakash Srirangam, Pierre Lhuissier, Luc Salvo, Elodie Boller et al. "X-Ray Tomography and Small-Angle Neutron Scattering Characterization of Nano-Composites: Static and In Situ Experiments". In Light Metals 2014, 1389–93. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-48144-9_232.
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Wells, J. M. "In-Situ Fragment Analysis with X-Ray Computed Tomography, XCT". In Advances in Ceramic Armor III, 181–92. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2009. http://dx.doi.org/10.1002/9780470339695.ch16.
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Greenawald, Edward C., James B. Nagode, Chester F. Poranski e Young S. Ham. "In-Situ NDE of Navy Sonar Domes Via X-Ray Backscatter Tomography". In Review of Progress in Quantitative Nondestructive Evaluation, 881–88. Boston, MA: Springer US, 1995. http://dx.doi.org/10.1007/978-1-4615-1987-4_110.
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Hubálková, Jana, e Christos G. Aneziris. "Qualitative and Quantitative X-ray Tomography of Filter Macrostructures and Functional Components". In Multifunctional Ceramic Filter Systems for Metal Melt Filtration, 257–74. Cham: Springer International Publishing, 2024. http://dx.doi.org/10.1007/978-3-031-40930-1_11.
Abstract (sommario):
AbstractThis chapter focuses on the application of a conventional attenuation based X-ray computed tomography for the investigation of porous and dense structural components in different stages of the manufacturing process and loading. Firstly, the image acquisition process, image processing and qualitative evaluation are introduced using reticulated foam filter and a nozzle component as examples. Secondly, the quantification strategies of the reconstructed volume data involving segmentation of targeted features and its geometrical characterization are presented. Thirdly, the issue of ex-situ investigations is outlined and discussed using differently sized carbon-bonded alumina filters subjected to thermomechanical loading. Fourthly, the interrupted in-situ compression testing of glass foam structures is demonstrated. Finally, the benefits and limitations of conventional X-ray computed tomography as analysis method for porous and dense materials are emphasized.
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Patterson, Brian M., Nikolaus L. Cordes, Kevin Henderson, Xianghui Xiao e Nikhilesh Chawla. "Data Challenges of In Situ X-Ray Tomography for Materials Discovery and Characterization". In Materials Discovery and Design, 129–65. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-99465-9_6.
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Singh, Sudhanshu S., Jason J. Williams, X. Xiao, F. De Carlo e N. Chawla. "In Situ Three Dimentional (3D) X-Ray Synchrotron Tomography of Corrosion Fatigue in Al7075 Alloy". In Fatigue of Materials II, 17–25. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-48105-0_2.
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Sun, Y. L., T. Lowe, S. A. McDonald, Q. M. Li e P. J. Withers. "In Situ Investigation and Image-Based Modelling of Aluminium Foam Compression Using Micro X-Ray Computed Tomography". In Augmented Vision and Reality, 189–97. Berlin, Heidelberg: Springer Berlin Heidelberg, 2014. http://dx.doi.org/10.1007/978-3-642-55131-4_10.
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Wingate, Brian P., e Michael W. Czabaj. "In-Situ Imaging of Flexure-Induced Fracture in Fiber-Reinforced Composites Using High-Resolution X-Ray Computed Tomography". In Mechanics of Composite, Hybrid and Multifunctional Materials, Volume 5, 331–34. Cham: Springer International Publishing, 2018. http://dx.doi.org/10.1007/978-3-319-95510-0_44.
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Grupp, R., M. Nöthe, B. Kieback e J. Banhart. "In-Situ Investigation of the Cooperative Material Transport during the Early Stage of Sintering by Synchrotron X-Ray Computed Tomography". In Ceramic Transactions Series, 83–90. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2010. http://dx.doi.org/10.1002/9780470599730.ch9.
Atti di convegni sul tema "In Situ X Ray Nano Tomography":
1
De Andrade, Vincent, Alex Deriy, Michael Wojcik, Doga Gürsoy, Deming Shu, Tim Mooney, Kevin M. Peterson et al. "A new transmission x-ray microscope for in-situ nano-tomography at the APS (Conference Presentation)". In Developments in X-Ray Tomography X, a cura di Bert Müller, Ge Wang e Stuart R. Stock. SPIE, 2016. http://dx.doi.org/10.1117/12.2239449.
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Starchenko, Vitalii, Ke Yuan, Juliane Weber, Michael Cheshire, Nikhil Rampal e Andrew G. Stack. "Connecting in situ X-Ray Nano- and Micro-Tomography via Fluid Dynamics Simulations to Study Barium Sulfate Mineral Precipitation". In Goldschmidt2020. Geochemical Society, 2020. http://dx.doi.org/10.46427/gold2020.2451.
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MEHDIKHANI, MAHOOR, SHAILEE UPADHYAY, JEROEN SOETE, YENTL SWOLFS, ABRAHAM GEORGE SMITH, M. ALI ARAVAND, ANDREW H. LIOTTA et al. "DEEP-LEARNING DETECTION OF CRACKS IN IN-SITU COMPUTED TOMOGRAMS OF NANO-ENGINEERED COMPOSITES". In Proceedings for the American Society for Composites-Thirty Seventh Technical Conference. Destech Publications, Inc., 2022. http://dx.doi.org/10.12783/asc37/36481.
Abstract (sommario):
The deformation and damage development of nano-engineered composites have not yet been investigated in 3D, although it can provide a deeper insight into their damage behavior. To fill this gap, we perform a tensile test on a nano-engineered composite with in-situ X-ray micro-Computed Tomography (micro-CT). The composite is made from woven alumina fibers with grafted carbon nanotubes (CNTs) and epoxy. More diffuse damage seems to exist for the materials with CNTs compared to the baseline material. However, at such resolution where individual fibers are vaguely visible, grayscale thresholding does not accurately characterize the matrix cracks due to their small opening and low contrast with the material itself. Thus, we employ a deep-learning tool, called RootPainter, for segmentation of cracks with small opening in relation to the voxel size, in the 3D images. The results show that RootPainter can reliably identify these small cracks. In addition to the investigation of the mechanical performance of the nano-engineered composite, this study provides a novel and reliable method for the characterization of micro-cracks in in-situ tomograms of these composites.
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Jadhav, Manavi, Martin Holt e Robert Winarski. "COMBINED NANO-COMPUTED TOMOGRAPHY AND X-RAY FLUORESCENCE EXPERIMENTS: A POWERFUL, NON-DESTRUCTIVE TECHNIQUE FOR THE IN-SITU CHEMICAL ANALYSES OF EXTRATERRESTRIAL MATERIALS". In GSA Annual Meeting in Indianapolis, Indiana, USA - 2018. Geological Society of America, 2018. http://dx.doi.org/10.1130/abs/2018am-324814.
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Schneider, Gerd, Peter Guttmann, Stefan Heim, Waltraud Müller e Jim McNally. "X-Ray Nano-Tomography at HZB". In Frontiers in Optics. Washington, D.C.: OSA, 2009. http://dx.doi.org/10.1364/fio.2009.fthg1.
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Rau, Christoph, Shashidhara Marathe, Andrew J. Bodey, Malte Storm, Darren Batey, Silvia Cipiccia, Peng Li e Ralf Ziesche. "High-throughput micro and nano-tomography". In Developments in X-Ray Tomography XIII, a cura di Bert Müller e Ge Wang. SPIE, 2021. http://dx.doi.org/10.1117/12.2598470.
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Moosmann, Julian, D. C. Florian Wieland, Berit Zeller-Plumhoff, Silvia Galli, Diana Krüger, Alexey Ershov, Silke Lautner et al. "A load frame for in situ tomography at PETRA III". In Developments in X-Ray Tomography XII, a cura di Bert Müller e Ge Wang. SPIE, 2019. http://dx.doi.org/10.1117/12.2530445.
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Le Bourlot, Christophe, Amin Azman, Jérôme Adrien e Eric Maire. "An example of in situ ductile damage analysis by tracking algorithm". In Developments in X-Ray Tomography XII, a cura di Bert Müller e Ge Wang. SPIE, 2019. http://dx.doi.org/10.1117/12.2531357.
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Humbel, Mattia, Mario Scheel, Christine Tanner, Griffin Rodgers, Georg Schulz, Corinne Carlucci, Jeannette von Jackowski et al. "Nano-tomography of dental composites with wide color matching". In Developments in X-Ray Tomography XIV, a cura di Bert Müller e Ge Wang. SPIE, 2022. http://dx.doi.org/10.1117/12.2635928.
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Li, Mengzhou, Victoria Cooley, Viktor Nikitin, Stuart R. Stock e Ge Wang. "Metal pin artifact reduction with masked iterative nano-CT reconstruction". In Developments in X-Ray Tomography XIV, a cura di Bert Müller e Ge Wang. SPIE, 2022. http://dx.doi.org/10.1117/12.2635261.
Rapporti di organizzazioni sul tema "In Situ X Ray Nano Tomography":
1
Hunter, Bryan. Compression Analysis of Materials via in situ X-ray Computed Tomography. Office of Scientific and Technical Information (OSTI), giugno 2022. http://dx.doi.org/10.2172/1872330.
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Patterson, Brian M., Nikolaus Lynn Cordes, Bryce C. Tappan, Darla Graff Thompson e Virginia Warren Manner. Damaging HMX/HTPB formulations: In-situ compression imaging using X-ray micro computed tomography. Office of Scientific and Technical Information (OSTI), aprile 2015. http://dx.doi.org/10.2172/1178309.