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Добірка наукової літератури з теми "Tomography in-situ"

Автор: Grafiati

Опубліковано: 11 березня 2023

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Статті в журналах з теми "Tomography in-situ"

Maire, Eric, Jerome Adrien, Caroline Landron, Marco Dimichiel, and Luc Salvo. "OS05-2-1 In situ experiments in Synchrotron X ray Tomography." Abstracts of ATEM : International Conference on Advanced Technology in Experimental Mechanics : Asian Conference on Experimental Mechanics 2011.10 (2011): _OS05–2–1—. http://dx.doi.org/10.1299/jsmeatem.2011.10._os05-2-1-.

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Hata, Satoshi, Shinsuke Miyazaki, Takashi Gondo, Hiroya Miyazaki, Katsumi Kawamoto, Noritaka Horii, Hiromitsu Furukawa, Kazuhisa Sato, Hiroyuki Kudo, and Mitsuhiro Murayama. "Electron Tomography with in-situ Deformation." Materia Japan 55, no. 12 (2016): 595. http://dx.doi.org/10.2320/materia.55.595.

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Vamvakeros, Antonios, Simon D. M. Jacques, Marco Di Michiel, Pierre Senecal, Vesna Middelkoop, Robert J. Cernik, and Andrew M. Beale. "Interlaced X-ray diffraction computed tomography." Journal of Applied Crystallography 49, no. 2 (March 1, 2016): 485–96. http://dx.doi.org/10.1107/s160057671600131x.

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An X-ray diffraction computed tomography data-collection strategy that allows, post experiment, a choice between temporal and spatial resolution is reported. This strategy enables time-resolved studies on comparatively short timescales, or alternatively allows for improved spatial resolution if the system under study, or components within it, appear to be unchanging. The application of the method for studying an Mn–Na–W/SiO2 fixed-bed reactor in situ is demonstrated. Additionally, the opportunities to improve the data-collection strategy further, enabling post-collection tuning between statistical, temporal and spatial resolutions, are discussed. In principle, the interlaced scanning approach can also be applied to other pencil-beam tomographic techniques, like X-ray fluorescence computed tomography, X-ray absorption fine structure computed tomography, pair distribution function computed tomography and tomographic scanning transmission X-ray microscopy.

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Merkle, Arno, Marijn Boone, and Denis Van Loo. "In situ Dynamic X-ray Tomography in the Laboratory." Microscopy and Microanalysis 24, S1 (August 2018): 998–99. http://dx.doi.org/10.1017/s1431927618005482.

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Nestola, Fabrizio, Marcello Merli, Paolo Nimis, Matteo Parisatto, Maya Kopylova, Andrea De Stefano, Micaela Longo, Luca Ziberna, and Murli Manghnani. "In situ analysis of garnet inclusion in diamond using single-crystal X-ray diffraction and X-ray micro-tomography." European Journal of Mineralogy 24, no. 4 (July 30, 2012): 599–606. http://dx.doi.org/10.1127/0935-1221/2012/0024-2212.

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Jørgensen, J. S., E. Ametova, G. Burca, G. Fardell, E. Papoutsellis, E. Pasca, K. Thielemans, et al. "Core Imaging Library - Part I: a versatile Python framework for tomographic imaging." Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 379, no. 2204 (July 5, 2021): 20200192. http://dx.doi.org/10.1098/rsta.2020.0192.

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We present the Core Imaging Library (CIL), an open-source Python framework for tomographic imaging with particular emphasis on reconstruction of challenging datasets. Conventional filtered back-projection reconstruction tends to be insufficient for highly noisy, incomplete, non-standard or multi-channel data arising for example in dynamic, spectral and in situ tomography. CIL provides an extensive modular optimization framework for prototyping reconstruction methods including sparsity and total variation regularization, as well as tools for loading, preprocessing and visualizing tomographic data. The capabilities of CIL are demonstrated on a synchrotron example dataset and three challenging cases spanning golden-ratio neutron tomography, cone-beam X-ray laminography and positron emission tomography. This article is part of the theme issue ‘Synergistic tomographic image reconstruction: part 2’.

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Patterson, Brian M., Nikolaus L. Cordes, Kevin Henderson, Xianghui Xiao, and Nikhilesh Chawla. "In situ Imaging of Materials using X-ray Tomography." Microscopy and Microanalysis 24, S1 (August 2018): 1002–3. http://dx.doi.org/10.1017/s1431927618005500.

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Meglis, I. L., T. Chow, C. D. Martin, and R. P. Young. "Assessing in situ microcrack damage using ultrasonic velocity tomography." International Journal of Rock Mechanics and Mining Sciences 42, no. 1 (January 2005): 25–34. http://dx.doi.org/10.1016/j.ijrmms.2004.06.002.

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Eggert, Anja, Martina Müller, Frank Nachtrab, Jannika Dombrowski, Alexander Rack, and Simon Zabler. "High-speed in-situ tomography of liquid protein foams." International Journal of Materials Research 105, no. 7 (July 14, 2014): 632–39. http://dx.doi.org/10.3139/146.111057.

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Erdmann, Philipp S., Jürgen M. Plitzko, and Wolfgang Baumeister. "Addressing cellular compartmentalization by in situ cryo-electron tomography." Current Opinion in Colloid & Interface Science 34 (March 2018): 89–99. http://dx.doi.org/10.1016/j.cocis.2018.05.003.

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Більше джерел

Дисертації з теми "Tomography in-situ"

Jailin, Clément. "Projection-based in-situ 4D mechanical testing." Thesis, Université Paris-Saclay (ComUE), 2018. http://www.theses.fr/2018SACLN034/document.

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L'analyse quantitative de volumes 3D obtenus par tomographie permet l’identification et la validation de modèles. La séquence d’analyse consiste en trois problèmes inverses successifs : (i) reconstruction des volumes (ii) mesure cinématique par corrélation d'images volumiques (DVC) et (iii) identification. Les très longs temps d’acquisition nécessaires interdisent de capter des phénomènes rapides. Une méthode de mesures, Projection-based Digital Volume Correlation (P-DVC), raccourcit la séquence précédente en identifiant les quantités clés sur les projections. Cette technique réduit jusqu'à 2 le nombre de radiographies utilisées pour le suivi de l’essai au lieu de 500 à 1000. Cette thèse étend cette approche en réduisant la quantité d’informations acquises, rendant ainsi accessibles des phénomènes de plus en plus rapides et repoussant les limites de la résolution temporelle. Deux axes ont ainsi été développés : - d’une part, l'utilisation de différentes régularisations, spatiales et temporelles des champs 4D (espace/temps) mesurés généralise la méthode P-DVC (avec volume de référence) à l'exploitation d’une seule radiographie par étape de chargement. L’essai peut désormais être réalisé de façon continue, en quelques minutes au lieu de plusieurs jours; - d’autre part, la mesure du mouvement peut être utilisée pour corriger le volume reconstruit lui-même. Cette observation conduit à proposer une nouvelle procédure de co-détermination du volume et de sa cinématique (sans prérequis), ce qui ouvre ainsi de nouvelles perspectives pour l’imagerie des matériaux et médicale où parfois le mouvement ne peut pas être interrompu. Le développement de ces deux axes permet d’envisager de nouvelles façons de réaliser les essais, plus rapides et plus centrés sur l’identification de quantités clés. Ces méthodes sont compatibles avec les récents développements « instrumentaux » de la tomographie rapide en synchrotron ou laboratoire, et permettent de réduire de plusieurs ordres de grandeurs les temps d’acquisition et les doses de rayonnement
The quantitative analysis of 3D volumes obtained from tomography allows models to be identified and validated. It consists of a sequence of three successive inverse problems: (i) volume reconstruction (ii) kinematic measurement from Digital Volume Correlation (DVC) and (iii) identification. The required very long acquisition times prevent fast phenomena from being captured.A measurement method, called Projection-based DVC (P-DVC), shortens the previous sequence and identifies the kinematics directly from the projections. The number of radiographs needed for tracking the time evolution of the test is thereby reduced from 500 to 1000 down to 2.This thesis extends this projection-based approach to further reduce the required data, letting faster phenomena be captured and pushing the limits of time resolution. Two main axes were developed:- On the one hand, the use of different spatial and temporal regularizations of the 4D fields (space/time) generalizes the P-DVC approach (with a known reference volume) to the exploitation of a single radiograph per loading step. Thus, the test can be carried out with no interruptions, in a few minutes instead of several days.- On the other hand, the measured motion can be used to correct the reconstructed volume itself. This observation leads to the proposition of a novel procedure for the joint determination of the volume and its kinematics (without prior knowledge) opening up new perspectives for material and medical imaging where sometimes motion cannot be interrupted.end{itemize}The development of these two axes opens up new ways of performing tests, faster and driven to the identification of key quantities of interest. These methods are compatible with the recent ``hardware" developments of fast tomography, both at synchrotron beamlines or laboratory and save several orders of magnitude in acquisition time and radiation dose

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Arnold, Klaus, Astrid Ziemann, and Armin Raabe. "Acoustic tomography in comparision to in-situ temperature and wind measurements." Universitätsbibliothek Leipzig, 2016. http://nbn-resolving.de/urn:nbn:de:bsz:15-qucosa-216523.

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Acoustic travel time tomography is presented as an experimental technique for remote monitoring of areally averaged meteorological quantities as the air temperature and the horizontal wind speed. This ground based remote sensing technique uses the nearly horizontal propagation of sound waves in the atmospheric surface layer. Here the acoustic travel time tomography was applied by measuring the travel time at defined propagation paths between several sound sources and receivers. The resulting sound speed were used to obtain estimates of the meteorological parameters. A measuring campaign was carried out at the test site in Lindenberg (DWD) to compare the acoustically derived data with conventional systems. These observations demonstrated that on one side the accuracy of the acoustic system is comparable with in-situ measurements and on the other side the temperature was particularly significant overestimated by the standard sensors, e.g. due to the radiation influence
Die Akustische Laufzeittomographie wird als ein experimentelles Verfahren zur Sondierung meteorologischer Parameter, wie z.B. der Lufttemperatur und der horizontalen Windgeschwindigkeit, vorgestellt. Dieses bodengebundene Fernerkundungsverfahren nutzt die horizontale Ausbreitung von Schallwellen in der atmosphärischen Grenzschicht. Hier wird das Verfahren der Laufzeittomographie angewendet, d.h. bei bekannter Weglänge wird die Ausbreitungszeit von ausgesendeten Schallsignalen zwischen mehreren Schallquellen und Empfängern gemessen. Die resultierenden Schallgeschwindigkeitsinformationen werden genutzt, um daraus die entsprechenden meteorologischen Parameter abzuleiten. Auf dem Gelände des Meteorologischen Observatoriums Lindenberg (DWD) wurde eine Messkampagne durchgeführt, um die akustischen Sondierungen mit konventionellen Systemen zu vergleichen. Die Auswertungen zeigen, dass einerseits die Genauigkeit der Akustischen Tomographie vergleichbar mit den konventionellen in-situ Messungen ist und andererseits, dass die Lufttemperatur aufgrund des Strahlungseinflusses bei Messungen mit den üblichen Sensoren zum Teil erheblich überschätzt wird

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Arnold, Klaus, Astrid Ziemann, and Armin Raabe. "Acoustic tomography in comparision to in-situ temperature and wind measurements." Wissenschaftliche Mitteilungen des Leipziger Instituts für Meteorologie ; 22 = Meteorologische Arbeiten aus Leipzig ; 6 (2001), S. 60-68, 2001. https://ul.qucosa.de/id/qucosa%3A15201.

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Анотація:

Acoustic travel time tomography is presented as an experimental technique for remote monitoring of areally averaged meteorological quantities as the air temperature and the horizontal wind speed. This ground based remote sensing technique uses the nearly horizontal propagation of sound waves in the atmospheric surface layer. Here the acoustic travel time tomography was applied by measuring the travel time at defined propagation paths between several sound sources and receivers. The resulting sound speed were used to obtain estimates of the meteorological parameters. A measuring campaign was carried out at the test site in Lindenberg (DWD) to compare the acoustically derived data with conventional systems. These observations demonstrated that on one side the accuracy of the acoustic system is comparable with in-situ measurements and on the other side the temperature was particularly significant overestimated by the standard sensors, e.g. due to the radiation influence.
Die Akustische Laufzeittomographie wird als ein experimentelles Verfahren zur Sondierung meteorologischer Parameter, wie z.B. der Lufttemperatur und der horizontalen Windgeschwindigkeit, vorgestellt. Dieses bodengebundene Fernerkundungsverfahren nutzt die horizontale Ausbreitung von Schallwellen in der atmosphärischen Grenzschicht. Hier wird das Verfahren der Laufzeittomographie angewendet, d.h. bei bekannter Weglänge wird die Ausbreitungszeit von ausgesendeten Schallsignalen zwischen mehreren Schallquellen und Empfängern gemessen. Die resultierenden Schallgeschwindigkeitsinformationen werden genutzt, um daraus die entsprechenden meteorologischen Parameter abzuleiten. Auf dem Gelände des Meteorologischen Observatoriums Lindenberg (DWD) wurde eine Messkampagne durchgeführt, um die akustischen Sondierungen mit konventionellen Systemen zu vergleichen. Die Auswertungen zeigen, dass einerseits die Genauigkeit der Akustischen Tomographie vergleichbar mit den konventionellen in-situ Messungen ist und andererseits, dass die Lufttemperatur aufgrund des Strahlungseinflusses bei Messungen mit den üblichen Sensoren zum Teil erheblich überschätzt wird.

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Kareh, Kristina Maria. "In situ synchrotron tomography of granular deformation in semi-solid Al-Cu alloys." Thesis, Imperial College London, 2013. http://hdl.handle.net/10044/1/29367.

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Optimising casting routes involving semi-solid deformation such as semi-solid processing and high-pressure die casting requires a fundamental understanding of the globule-scale mechanisms behind the macroscopic rheological behaviour. This thesis uses time-resolved 3D imaging to directly observe and measure semi-solid alloy deformation from a microstructural perspective. Under isothermal conditions and constant strain rates, deformation mechanisms both at the crystal scale and at the specimen scale were identified during deformation in globular Al-Cu alloys at 64-93% solid. Imaging and quantifying these mechanisms has led to the emergence of a refined understanding of semi-solid deformation based on granular material concepts. It is shown that globularised crystals (above fs > 60%) exclusively rearrange as individual grains during parallel plate compression and backward extrusion at low strain rates. Crystal-crystal interactions are identified for the two loading modes and are not accompanied by plastic deformation of the individual crystals during acquisition. The ubiquitous grain rearrangement is coupled with shear-induced dilation of the solid assembly, whereby the crystals push each other apart in order to accommodate the increasing strain. It is also shown that, for specimens lacking a liquid reservoir, shear-induced dilation causes menisci to be pulled into the specimen from the surface and additionally, at high solid fractions, internal pores to grow. The origins of cracking during semi-solid processing are explored in a granular framework and linked to the shear-induced dilation associated with the solid assembly which increases the initial width of the liquid channels between the grains. Finally, the discrete grain analysis is coupled with the bulk mechanical results to explore the shape of the stress-strain curve and relate it to the imaged and quantified behaviours. All solid fractions tend to the same final stress, hinting at the possibility of a critical state analogous to that in soil mechanics, although fully testing this hypothesis requires varying the confining pressure.

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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.

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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 échantillon
This 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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Philippe, Julien. "Développement d'une presse portative pour les études in et ex situ sous conditions extrêmes de pression, température et déformation." Thesis, Paris 6, 2017. http://www.theses.fr/2017PA066008.

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Les hautes pressions sont précieuses à plusieurs disciplines scientifiques. Ce sera le cas dans cette thèse avec le développement d'un nouvel appareil permettant des possibilités inédites de tomographie et de déformation sous haute pression et haute température. Il apporte la possibilité de nouvelles études scientifiques dans les différents champs disciplinaires que sont les sciences de la Terre, la chimie mécanique, la physique des matériaux et la physique des liquides
High pressures are essential in several scientific field. This will be the case in this thesis with the development of a new device enabling new possibilities tomography and deformation under high pressure and high temperature. It brings the possibility of further scientific studies in the various disciplines that are Earth science, mechanical chemistry, physics of materials and liquids physics

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Renner, Axel, Uwe Marschner, and Wolf-Joachim Fischer. "A new imaging approach for in situ and ex situ inspections of conductive fiber–reinforced composites by magnetic induction tomography." Sage, 2014. https://tud.qucosa.de/id/qucosa%3A35619.

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Fiber-reinforced plastics for industrial applications face constantly increasing demands regarding efficiency, reliability, and economy. Furthermore, it was shown that fiber-reinforced plastics with tailored reinforcements are superior to metallic or monolithic materials. However, a trustworthy description of the load-specific failure behavior and damage evolution of composite structures can hardly be given, because these processes are very complex and are still not entirely understood. Among other things, several research groups have shown that material damages like fiber fracture, delamination, matrix cracking, or flaws can be discovered by analyzing the electrical properties of conductive composites, for example, carbon fiber–reinforced plastics. Furthermore, it was shown that this method could be used for structural health monitoring or nondestructive evaluation. Within this study, magnetic induction tomography, which is a new imaging approach, is introduced in the topic of nondestructive evaluation of carbon fiber–reinforced plastics. This non-contacting imaging method gains the inner spatial distribution of conductivity of a specimen and depicts material inhomogeneity, like damages, not only in two-dimensional images but also in three-dimensional images. Numerical and experimental investigations are presented, which give a first impression of the performance of this technique. It is demonstrated that magnetic induction tomography is a promising approach for nondestructive evaluation. Potentially, it can be used for fabrication quality control of conductive fiber–reinforced plastics and as a structural health monitoring system using an integrated or superficially applied magnetic induction tomography setup.

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Tireira, Aly. "Endommagement dans les alliages AlSi12 pour moteurs automobiles : Observations in situ et modélisation micromécanique." Thesis, Saint-Etienne, EMSE, 2015. http://www.theses.fr/2015EMSE0780/document.

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Cette thèse s'intéresse aux mécanismes de déformations et d’endommagement dans les alliages de coulée pour l’industrie automobile. Les études ont porté sur un alliage modèle contenant 12% de silicium et des éléments d’addition. Il a été fabriqué par le procédé squeeze-casting (coulée sous haute pression) au LKR de l’Université Technologique de Vienne avec laquelle cette thèse s’est déroulée en collaboration. Des essais de traction in situ dans le MEB ainsi que sous tomographie aux rayons X ont permis de suivre l’évolution des microstructures pendant le chargement. Une attention particulière a été portée sur les mécanismes d’initiation et de propagation de l’endommagement. Par ailleurs la technique de la corrélation d’images numérique 2D spécialement développée pour être appliquée à des images MEB a été utilisée pour mesurer les mécanismes d’endommagement à l’échelle des inclusions. Une attention particulièreest portée sur les mécanismes de localisation de la déformation. La corrélation d’images numériques 3D appliquée aux images tomographiques a permis une mesure précise de l’évolution de l’endommagement au cours du chargement. Les données expérimentales obtenues ont permis d’adapter un modèle d’endommagement de type GTN. Une dernière étape s’est consacrée à une modélisation micro mécaniques des microstructures. Des méthodes de caractérisations basées sur des hypothèses statistiques ont permis de mesurer et d’identifier des paramètres microstructuraux. Au regard des mécanismes de déformations et de la morphologie des particules de seconde phases, des microstructures modèles sont proposées pour simuler le comportement du matériau réel. Cette démarche servant essentiellement à simplifier les modèles éléments finis afin de gagner en temps de calcul, elle sert aussi à insérer des mécanismes complexes afin de serapprocher le plus possible du comportement réel du matériau
This thesis focuses on the mechanisms of deformation and damage in cast aluminum alloysfor automotive industry. Studies were carried on a model alloy containing 12% silicon and added element like iron and nickel. The material was prepared by squeeze-casting process at the Vienna University of Technology in Austria with which this thesis was held in collaboration. In situ tensile test with X-rays tomographic observations as well as with Scanning Electron Microscope observations were performed. They allowed following microstructure evolution under mechanical loading. Particular attention was paid to the mechanisms of initiation and propagation of damage. Furthermore the technic of Digital Image Correlation (DIC) developed to be applied to SEM images was used to visualize 2D strain localization mechanisms at second phases particles scale. DIC were also applied on tomographic images and allowed to measure accurately in 3D damage evolution under loading. Experimental data obtained from DIC were used to identify parameters of a Gurson Tvergaard Needleman model and allow to simulate by Finite Element Modeling the damage evolution. At last stages micro mechanical studies were performed by FEM using microstructure obtained from tomographic images. Algorithms were developed to measure and identify statistics parameters of the microstructure. In consideration of the mechanism of deformations and second phase particles morphology, generatedmicrostructures are proposed to simulate the behavior of the material. This approach aims to simplify the FEM models by reducing the number of degree of Freedom and, then reduce computation time. It also enables to insert complex mechanisms in the model to be as close as possible the actual behavior of the material

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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.

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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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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.

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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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Книги з теми "Tomography in-situ"

Tweeton, Daryl R. A tomographic computer program with constraints to improve reconstructions for monitoring in situ mining leachate. Pittsburgh, Pa: U.S. Dept. of the Interior, Bureau of Mines, 1988.

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In-Situ X-Ray Tomographic Study of Materials. MDPI, 2020. http://dx.doi.org/10.3390/books978-3-03936-530-2.

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Частини книг з теми "Tomography in-situ"

Sause, Markus G. R. "Computed Tomography." In In Situ Monitoring of Fiber-Reinforced Composites, 457–532. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-30954-5_6.

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Baumeister, Wolfgang. "Cryoelectron Tomography or Doing Structural Biology In Situ." In Macromolecular Crystallography, 51–54. Dordrecht: Springer Netherlands, 2011. http://dx.doi.org/10.1007/978-94-007-2530-0_4.

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Englmeier, Robert, and Friedrich Förster. "In Situ Studies of Mitochondrial Translation by Cryo-Electron Tomography." In Methods in Molecular Biology, 243–68. New York, NY: Springer US, 2020. http://dx.doi.org/10.1007/978-1-0716-0834-0_18.

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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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Lai, Longsheng, Yee-Wai Cheung, Matthew Martinez, Kathryn Kixmoeller, Leon Palao, Stefan Steimle, Meng-Chiao Ho, Ben E. Black, Erh-Min Lai, and Yi-Wei Chang. "In Situ Structure Determination of Bacterial Surface Nanomachines Using Cryo-Electron Tomography." In Methods in Molecular Biology, 211–48. New York, NY: Springer US, 2023. http://dx.doi.org/10.1007/978-1-0716-3060-0_18.

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Greenawald, Edward C., James B. Nagode, Chester F. Poranski, and 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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Zhu, Shiwei, Zhuan Qin, Juyu Wang, Dustin R. Morado, and Jun Liu. "In Situ Structural Analysis of the Spirochetal Flagellar Motor by Cryo-Electron Tomography." In Methods in Molecular Biology, 229–42. New York, NY: Springer New York, 2017. http://dx.doi.org/10.1007/978-1-4939-6927-2_18.

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Patterson, Brian M., Nikolaus L. Cordes, Kevin Henderson, Xianghui Xiao, and 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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Kaplan, Mohammed, William J. Nicolas, Wei Zhao, Stephen D. Carter, Lauren Ann Metskas, Georges Chreifi, Debnath Ghosal, and Grant J. Jensen. "In Situ Imaging and Structure Determination of Biomolecular Complexes Using Electron Cryo-Tomography." In cryoEM, 83–111. New York, NY: Springer US, 2020. http://dx.doi.org/10.1007/978-1-0716-0966-8_4.

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Singh, Sudhanshu S., Jason J. Williams, X. Xiao, F. De Carlo, and 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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Тези доповідей конференцій з теми "Tomography in-situ"

Scopelliti, Matteo Giuseppe, Yasin Karimi, and Maysamreza Chamanzar. "Ultrasonically-assisted in-situ Micro-endoscopic Optical Imaging." In Optical Tomography and Spectroscopy. Washington, D.C.: OSA, 2020. http://dx.doi.org/10.1364/ots.2020.stu4d.1.

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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, edited by Bert Müller and Ge Wang. SPIE, 2019. http://dx.doi.org/10.1117/12.2530445.

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Le Bourlot, Christophe, Amin Azman, Jérôme Adrien, and Eric Maire. "An example of in situ ductile damage analysis by tracking algorithm." In Developments in X-Ray Tomography XII, edited by Bert Müller and Ge Wang. SPIE, 2019. http://dx.doi.org/10.1117/12.2531357.

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Albinet, C., P. Borderies, A. Hamadi, P. Dubois-Fernandez, T. Koleck, S. Angelliaume, and Hubert Cantalloube. "High resolution in-situ tomography on pine forests." In IGARSS 2013 - 2013 IEEE International Geoscience and Remote Sensing Symposium. IEEE, 2013. http://dx.doi.org/10.1109/igarss.2013.6721090.

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Holodovsky, Vadim, Yoav Y. Schechner, Anat Levin, Aviad Levis, and Amit Aides. "In-situ multi-view multi-scattering stochastic tomography." In 2016 IEEE International Conference on Computational Photography (ICCP). IEEE, 2016. http://dx.doi.org/10.1109/iccphot.2016.7492869.

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Zheng, Yi, Melania Rogowska, Yi Yang, and Carsten Gundlach. "Micro-CT in situ study of carbonate rock microstructural evolution for geologic CO2 storage." In Developments in X-Ray Tomography XI, edited by Bert Müller and Ge Wang. SPIE, 2017. http://dx.doi.org/10.1117/12.2273877.

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Wu, Yanlin, Hidekazu Takano, and Atsushi Momose. "In situ observation of polymer blend phase separation by x-ray Talbot-Lau interferometer." In Developments in X-Ray Tomography XI, edited by Bert Müller and Ge Wang. SPIE, 2017. http://dx.doi.org/10.1117/12.2273320.

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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, edited by Bert Müller, Ge Wang, and Stuart R. Stock. SPIE, 2016. http://dx.doi.org/10.1117/12.2239449.

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Shi, Lei, Wen-Zhan Song, Fan Dong, and Goutham Kamath. "Sensor Network for Real-time In-situ Seismic Tomography." In International Conference on Internet of Things and Big Data. SCITEPRESS - Science and and Technology Publications, 2016. http://dx.doi.org/10.5220/0005897501180128.

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Croton, Linda, Kelly Crossley, Courtney McDonald, Kaye Morgan, Tayla Penny, Robert Galinsky, Stuart Hooper, et al. "Pre-clinical phase-contrast imaging of the whole brain in situ: from traumatic to diffuse white matter injury." In Developments in X-Ray Tomography XIV, edited by Bert Müller and Ge Wang. SPIE, 2022. http://dx.doi.org/10.1117/12.2633340.

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Звіти організацій з теми "Tomography in-situ"

Hunter, Bryan. Compression Analysis of Materials via in situ X-ray Computed Tomography. Office of Scientific and Technical Information (OSTI), June 2022. http://dx.doi.org/10.2172/1872330.

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Patterson, Brian M., Nikolaus Lynn Cordes, Bryce C. Tappan, Darla Graff Thompson, and Virginia Warren Manner. Damaging HMX/HTPB formulations: In-situ compression imaging using X-ray micro computed tomography. Office of Scientific and Technical Information (OSTI), April 2015. http://dx.doi.org/10.2172/1178309.

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