Relevant bibliographies by topics / Pulsed eddy-current nondestructive testing

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  2. Dissertations / Theses
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Academic literature on the topic 'Pulsed eddy-current nondestructive testing'

Author: Grafiati
Published: 30 May 2022
Last updated: 31 May 2022

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Journal articles on the topic "Pulsed eddy-current nondestructive testing"

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Suh, Dong-Man. "Principles of Pulsed Eddy Current Nondestructive Testing." Journal of the Korean Society for Nondestructive Testing 32, no. 2 (2012): 210–13. http://dx.doi.org/10.7779/jksnt.2012.32.2.210.

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Vasic, D., V. Bilas, and D. Ambrus. "Pulsed Eddy-Current Nondestructive Testing of Ferromagnetic Tubes." IEEE Transactions on Instrumentation and Measurement 53, no. 4 (2004): 1289–94. http://dx.doi.org/10.1109/tim.2004.830594.

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Grochowalski, Jacek Michał, and Tomasz Chady. "Pulsed Multifrequency Excitation and Spectrogram Eddy Current Testing (PMFES-ECT) for Nondestructive Evaluation of Conducting Materials." Materials 14, no. 18 (2021): 5311. http://dx.doi.org/10.3390/ma14185311.

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This paper presents a new method for nondestructive testing—a pulsed multifrequency excitation and spectrogram eddy current testing (PMFES-ECT), which is an extension of the multifrequency excitation and spectrogram eddy current testing. The new method uses excitation in the form of pulses repeated at a specified time, containing several periods of a waveform consisting of the sum of sinusoids with a selected frequency, amplitude and phase. This solution allows the maintenance of the advantages of multifrequency excitation and, at the same time, generates high energy pulses similar to those used in pulse eddy current testing (PECT). The effectiveness of the new method was confirmed by numerical simulations and the measurement of thin Inconel plates, consisting of notches manufactured by the electric-discharge method.
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Dai, X. W., R. Ludwig, and R. Palanisamy. "Numerical simulation of pulsed eddy-current nondestructive testing phenomena." IEEE Transactions on Magnetics 26, no. 6 (1990): 3089–96. http://dx.doi.org/10.1109/20.102897.

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Ghoni, Ruzlaini, Mahmood Dollah, Aizat Sulaiman, and Fadhil Mamat Ibrahim. "Defect Characterization Based on Eddy Current Technique: Technical Review." Advances in Mechanical Engineering 6 (January 1, 2014): 182496. http://dx.doi.org/10.1155/2014/182496.

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Eddy current testing is widely used for nondestructive evaluation of metallic structures in characterizing numerous types of defects occurring in various locations. It offers remarkable advantages over other nondestructive techniques because of its ease of implementation. This paper presents a technical review of Eddy current technique in various scope of defect detection. The first part presents Eddy current evaluation on various defects location and orientation such as steam generator tubes, stress crack corrosion, and fatigue cracks. The next section analyzes the use of pulsed Eddy current and pulsed Eddy current thermography as an alternative method for monitoring the growth of cracks with the aid of computational techniques for postsignal analysis.
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YANG, Binfeng. "Identification of corrosion fringe in pulsed eddy current nondestructive testing." Chinese Journal of Mechanical Engineering 44, no. 12 (2008): 75. http://dx.doi.org/10.3901/jme.2008.12.075.

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Liang, Yiping, Libing Bai, Xu Zhang, Chao Ren, and Yuhua Cheng. "Potential of Eddy Current Pulsed Thermography as a Nondestructive Testing Method." IEEE Instrumentation & Measurement Magazine 25, no. 2 (2022): 5–15. http://dx.doi.org/10.1109/mim.2022.9756437.

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Chen, Kai, Libing Bai, Yifan Chen, Yuhua Cheng, Shulin Tian, and Peipei Zhu. "Defect Automatic Identification of Eddy Current Pulsed Thermography." Journal of Sensors 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/326316.

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Eddy current pulsed thermography (ECPT) is an effective nondestructive testing and evaluation (NDT&E) technique, and has been applied for a wide range of conductive materials. Manual selected frames have been used for defects detection and quantification. Defects are indicated by high/low temperature in the frames. However, the variation of surface emissivity sometimes introduces illusory temperature inhomogeneity and results in false alarm. To improve the probability of detection, this paper proposes a two-heat balance states-based method which can restrain the influence of the emissivity. In addition, the independent component analysis (ICA) is also applied to automatically identify defect patterns and quantify the defects. An experiment was carried out to validate the proposed methods.
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Dolapchiev, Ivaylo, and Kostadin Brandisky. "Crack sizing by using pulsed eddy current technique and neural Network." Facta universitatis - series: Electronics and Energetics 19, no. 3 (2006): 371–77. http://dx.doi.org/10.2298/fuee0603371d.

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A neural network approach for solving an inverse problem of identification of crack width and depth is proposed. Radial Basis Function (RBF) neural networks (NN) perform the identification. It was trained using information from numerical simulated pulsed eddy current (PEC) nondestructive testing (NDT). The capability of the RBF NN was checked with information from numerical and physical experiment. The obtained results illustrate the efficiency of the approach.
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Wang, Zhenwei, and Yating Yu. "Traditional Eddy Current–Pulsed Eddy Current Fusion Diagnostic Technique for Multiple Micro-Cracks in Metals." Sensors 18, no. 9 (2018): 2909. http://dx.doi.org/10.3390/s18092909.

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Due to a harsh working environment, micro-cracks in metal structures (e.g., airplane, oil/gas pipeline, hydro-turbine) often lead to serious accidents, so health monitoring of the metals is of great significance to ensure their safe operation. However, it is hard to perform quantitative detection of multiple micro-cracks by a single nondestructive testing (NDT) technique because of their limits. To monitor for multiple micro-cracks in metals, a Traditional Eddy Current (TEC) and Pulsed Eddy Current (PEC) fusion NDT technique is proposed in this paper. In the proposed technique, the TEC technique is adopted to seek the locations of the micro-cracks in the whole of the metal, while the PEC technique is adopted to acquire information on the depth of micro-cracks automatically according to the location information by the TEC. The experiments indicate that the TEC–PEC fusion NDT system can localize the micro-cracks as well as detect the micro-cracks quantitatively and automatically; therefore, it can be applied in structural health monitoring of metal equipment or in picking candidate components in re-manufacturing engineering.
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Dissertations / Theses on the topic "Pulsed eddy-current nondestructive testing"

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Chebbi, Houssem. "Méthode des coordonnées curvilignes pour la modélisation électromagnétique des matériaux complexes : application au contrôle non destructif par courants de Foucault des matériaux composites The fast computation of eddy current distribution and probe response in homogenized composite material based on semi-analytical approach Investigation of layer interface model of multi-layer structure using semi-analytical and FEM analysis for eddy current pulsed thermography." Thesis, université Paris-Saclay, 2020. http://www.theses.fr/2020UPAST004.

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Ce travail de thèse de doctorat, effectué au sein de Laboratoire de Simulation et Modélisation Électromagnétique (LSME) du CEA List, s’intègre dans le cadre du projet européen « NDTonAir » financé sous l'action « H2020-MSCA-ITN-2016- GRANT 722134 ». Le principal objectif est le développement d’un outil de simulation rapide et précis dédié au contrôle non destructif par courants de Foucault des matériaux composites homogénéisés. Comme cas d’application, on s’intéresse particulièrement à l’orientation des fibres d’une part, et d’autre part, à des défauts de type délaminage et ondulation des fibres qui se manifestent par une déformation géométrique locale des interfaces. Les méthodes semi-analytiques existantes dans la littérature, basées sur le formalisme des Dyades de Green, sont limitées jusqu’au là à des structures planes multicouches. Pour introduire des variations locales de géométrie aux interfaces, nous proposons une approche innovante basée sur un changement de coordonnées adapté au profil de la pièce et des interfaces. On propose un modèle numérique performant basé sur le formalisme covariant des équations de Maxwell. Ce formalisme unificateur englobe l'anisotropie du spécimen et les déformations locales des interfaces. La méthode de coordonnées curvilignes est usuellement utilisée pour résoudre des problèmes de diffraction sur des surfaces rugueuses dans le domaine des hautes fréquences (diffraction sur des réseaux). Ce travail de thèse s’inspire des méthodes de Fourier modale et propose de nouveaux outils adaptés au domaine des courants de Foucault. L’extension de la méthode des coordonnées curvilignes au domaine du contrôle des composites par courants de Foucault constitue l’innovation de ce travail. Deux modèles numériques ont été développés pour le calcul de l’interaction du champ émis par un capteur à courants de Foucault avec un matériau composite multicouches. Le modèle numérique développé pour le contrôle des composites plans exploite les structures particulières des matrices creuses pour réduire le temps de calcul sans limitation de nombre de modes utilisés pour la représentation du champ. Dans le cas des profils curvilignes des interfaces, le modèle permet de traiter des interfaces parallèles et quelques cas particuliers des profils non parallèles. Ce cas général présente quelques limitations qui nécessitent le développement des outils numériques complémentaires. Enfin, plusieurs configurations de contrôle ont été envisagées et les résultats numériques produits par les modèles ont été confrontés à des données de simulation par éléments finis. Quelques expérimentations ont été effectuées dans des laboratoires partenaires étrangers pour accroître notre expérience sur la validation expérimentale<br>This doctoral thesis work, carried out within the Laboratory of Simulation and Modeling for Electromagnetics (LSME) of CEA List, is part of the “NDTonAir” European project funded under the action “H2020-MSCA-ITN -2016- GRANT 722134”. The main goal of the project is the development of a fast and accurate simulation tool for the non-destructive eddy current testing of homogenized composite materials. As an application case, we are particularly interested in the orientation of the fibers on the one hand, and on the other hand, in defects as delamination which are manifested by a local geometrical deformation of the interfaces. The semi-analytical methods existing in the literature, based on Green's Dyad formalism, have been limited so far to multilayered and planar structures. To introduce local variations in geometry at the interfaces, we propose an innovative approach based on a change of coordinates adapted to the profile of the local perturbation. We propose a powerful numerical model based on the covariant formalism of Maxwell's equations. This unifying formalism takes in the anisotropy of specimen and the local deformations of the interfaces. The curvilinear coordinate method is usually used to solve diffraction problems on rough interfaces in the high frequency domain (diffraction on gratings). This thesis work is inspired by Fourier Modal Methods and proposes new tools which have been adapted to the field of eddy currents. The extension of the curvilinear coordinate method to the field of eddy currents non-destructive testing technique of composites constitutes the innovation of this work. Two numerical models have been developed to calculate the interaction of the field emitted by an eddy current probe with a multilayered composite material. The numerical model developed for the evaluation of planar composite exploits the particular structures of sparse matrices to reduce the computation time without limiting the number of modes used for the modal expansion of the field. In the case of the curvilinear profiles of the interfaces, the model makes it possible to treat parallel interfaces and some particular cases of non-parallel profiles. The general case of non-identical profiles presents some limitations which require the development of complementary numerical tools. Finally, several testing configurations were considered and the numerical results produced by the models were compared to finite element simulated data. Some experiments were carried out in foreign partner laboratories to increase our experience on experimental validation
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Johnson, Marcus James. "Pulsed eddy-current measurements for materials characterization and flaw detection." Thesis, University of Surrey, 1997. http://epubs.surrey.ac.uk/966/.

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Adewale, Ibukun Dapo. "Multiple parameters based pulsed eddy current non-destructive testing and evaluation." Thesis, University of Newcastle upon Tyne, 2015. http://hdl.handle.net/10443/2766.

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Eddy current sensing technique is widely used primarily because of its high tolerance to harsh environments, low cost, broad bandwidth and ease of automation. And its variant, pulsed eddy current offers richer information of target materials. However, accurate detection and characterisation of defects remains a major challenge in the petro-chemical industry using this technique which leads to spurious detection and false alarm. A number of parameters are contributory, amongst which is the inhomogeneity of the materials, coupling variation effect and relatively large lift-off effect due to coating layers. These sometimes concurrently affect the response signal. For instance, harsh and dynamic operating conditions cause variation in the electrical conductivity and magnetic permeability of materials. Also, there is the increased need to detect defects and simultaneously measure the coating layer. In practice therefore, multi-sensing modalities are employed for a comprehensive assessment which is often capital intensive. In contrast to this, multiple parameter delineation and estimation from a single transient response which is cost-effective becomes essential. The research concludes that multiple parameter delineation helps in mitigating the effect of a parameter of interest to improve the accuracy of the PEC technique for defect detection and characterisation on the one hand and for multi-parameter estimation on the other. This research, partly funded by the Petroleum Technology Development Fund (PTDF), proposes use of a novel multiple parameter based pulsed eddy current NDT technique to address the challenges posed by these factors. Numerical modelling and experimental approaches were employed. The study used a 3D finite element model to understand, predict and delineate the effect of varying EM properties of test materials on PEC response; which was experimentally validated. Also, experimental studies have been carried out to demonstrate the capabilities of the proposed to estimate multiple parameters vis-à-vis defect depth (invariant of lift-off effects) and lift-off. The major contributions of the research can be summarised thus: (1) numerical simulation to understand and separate the effect of material magnetic permeability and electrical conductivity in pulsed eddy current measurements and experimental validation; (2) proposed the lift-off point of intersection (LOI) feature for defect estimation invariant of lift-off effects for ferromagnetic and non-ferromagnetic samples; a feature which is hitherto not apparent in ferromagnetic materials (a primary material used in the oil and gas industry); (3) separation and estimation of defect and the lift-off effects in magnetic sensor based pulsed eddy current response; and (4) application of the LOI feature and demonstration of increased defect sensitivity of the PEC technique with the proposed feature in both ferrous and non-ferrous conductive materials.
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Deng, Xiaodong. "Nondestructive evaluation of thermal sprayed coating by acoustic microscopy and Eddy current testing." Thesis, Lyon, INSA, 2014. http://www.theses.fr/2014ISAL0030/document.

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La thèse a mis en œuvre deux méthodes inverses pour l’évaluation non destructive d’un milieu multicouche anisotrope : la microscopie acoustique et les courants de Foucault. Pour la microscopie acoustique, nous avons adapté un modèle de propagation de l'onde acoustique dans un milieu multicouche, en calculant les coefficients de réflexion et de transmission d’un revêtement multicouche sur un substrat et en modélisant la réponse acoustique V(z) propre à la microscopie acoustique. Une méthode inverse utilisant l’algorithme de Levenberg-Marquardt donne accès à l’épaisseur, au module de Young et à la densité du revêtement. Pour les courants de Foucault, une méthode inverse similaire basée sur le formalisme de Tree a été mise au point, qui donne accès à l’épaisseur, à la conductivité électrique et à la perméabilité magnétique du revêtement. Après des vérifications de l’algorithme sur des matériaux massifs de référence, nous avons appliqué ces méthodes à un métal revêtu pour tuyauteries de centrale thermique : de l’acier inoxydable austénitique type 304 revêtu par pulvérisation thermique de superalliage Hastelloy C22 à base de nickel. La corrosion sèche sous l’effet des gaz chauds (air contenant du gaz SO2) amincit graduellement la paroi des tubes, ce qui peut les rendre dangereux. Il a fallu tenir compte de l’effet du grenaillage préalable à la pulvérisation, qui crée une mince couche de martensite à laquelle les courants de Foucault sont très sensibles : un modèle à trois couches substrat / martensite / revêtement a été utilisé. Nous avons caractérisé des échantillons de métal avant et après exposition à l’air avec ou sans SO2 à 650°C. Les deux méthodes d’évaluation non destructive permettent une détermination très satisfaisante de l’épaisseur de revêtement et se complètent bien. L’évaluation des caractéristiques physiques (acoustiques et électromagnétiques) met en évidence des hétérogénités du revêtement liées à son mode d’élaboration et des évolutions au cours du temps. Des pistes d’amélioration des méthodes sont proposées<br>In the current work, we investigate the nondestructive evaluation of a thermal sprayed coating (Hastelloy C22 Ni-based alloy) on substrate (type 304 austenitic stainless steel) using acoustic microscopy and ECT method. Two models were built for the evaluation of this kind of material: one is for acoustic V(z) measurement and the other is for swept eddy current measurement. The implementation of these two models is used for the evaluation and properties measurement of the thermal sprayed coatings, such as elastic properties, electromagnetic properties. In particular, the main achievements and results are as follows: 1. Acoustic wave propagation in an anisotropic multilayered medium was investigated. The formula for calculating the reflection and transmission coefficients of the multilayered medium on or without a substrate were derived, which is necessary for the modeling of acoustic V(z) measurement of the thermal sprayed coating on substrate. 2. A model was built for the acoustic V(z) measurement of the thermal sprayed coatings on substrate, which can deal with anisotropic multilayered media. Specifically, we used a model of multilayered coatings with graded properties on substrate to calculate the acoustic reflection coefficient of our sample. Treating the thermal sprayed coating, deposited on a 304 steel substrate, as FGMs, we evaluated the coating thickness and the Young’s modulus evolution along the depth of the coating. 3. A model was built for the swept eddy current measurement of the thermal sprayed coatings. Since before the spraying process, the surface of the substrate is usually shot-peened (SP), the coated material is considered as a three-layer medium. The coating thickness and electromagnetic properties of each of the 3 layers were determined by an effective reverse process. 4. The thermal sprayed coated material after exposure in different conditions, i.e., as-received, heat-treated in air and heat-treated in SO2 environment, and after different exposure time was evaluated by the integrity of acoustic microscopy and ECT method. The coating thickness and the electromagnetic properties of the coated material under different conditions were measured
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Лисенко, Юлія Юріївна. "Інформаційно–діагностична система імпульсного вихрострумового неруйнівного контролю виробів машинобудування". Doctoral thesis, Київ, 2017. https://ela.kpi.ua/handle/123456789/21603.

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Дисертація присвячена розробці інформаційно – діагностичної системи імпульсного вихрострумового неруйнівного контролю виробів машинобудування. В роботі проаналізовано процеси в ланцюгах вихрострумового перетворювача в умовах імпульсному режиму збудження та визначено умови виникнення загасаючих гармонічних коливань, що дозволило в якості інформативних параметрів сигналів вихрострумового перетворювача запропонувати використання їх власної частоти та коефіцієнта загасання. В роботі розроблено методику обробки та аналізу інформативних параметрів сигналів вихрострумового перетворювача в імпульсному режимі збудження, в основі якої лежить визначення запропонованих інформативних параметрів цих сигналів через їх амплітудну та фазову характеристики за допомогою застосування перетворення Гільберта. Запропоновано використання експоненційної апроксимації для амплітудної характеристики та лінійного тренду для фазової характеристики сигналу вихрострумового перетворювача для підвищення точності визначення інформативних параметрів цього сигналу. Проведено аналіз похибок визначення частоти власних коливань та коефіцієнта загасання сигналу вихрострумового перетворювача, який дозволив визначити умови отримання мінімальної похибки визначення цих інформативних параметрів сигналу та визначити оптимальний час аналізу, що суттєво впливає на результати контролю в умовах впливу завад і шумів.
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Ashigwuike, Evans Chinemezu. "Coupled finite element modelling and transduction analysis of a novel EMAT configuration operating on pipe steel materials." Thesis, Brunel University, 2014. http://bura.brunel.ac.uk/handle/2438/10497.

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Electromagnetic Acoustic Transducers (EMATs) are advanced ultrasonic transducers that generate and detect acoustic waves in an electrically conducting material without making physical contact with the material unlike its counterpart, the piezoelectric transducers (PZT). The conventional EMAT consists of copper coil that generates the dynamic field when excited with a sinusoidal current, a permanent or electromagnet that provides the bias field and the conducting material specimen. The complex interaction between the bias field and the Eddy current induced within the skin depth of the conducting material by the dynamic field gives rise to the acoustic wave that then propagates within the surface of the material. Within the research a finite element EMAT model was developed using commercial software Comsol Multiphysics, to study and compare the Eddy current density and Lorentz force density generated by three EMAT configurations: The Meander-line, Spiral and Key Type EMAT configuration respectively. It was observed that apart from the ease of fabrication and simplicity of connectivity when stacked in layers, the Key Type coil EMAT showed a high tendency to generate higher amplitude of Eddy current and Lorentz force test materials especially when stacked in layers. Also, the effect of varying some key EMAT parameters was investigated to determine the optimal performance of Key Type EMAT configuration on CS70 pipe steel plate. The research further developed a coupled finite element model using the same software, Comsol Multiphysics to account for the generation, propagation and detection of acoustic wave by the Key Type EMAT configuration on CS70 grade of pipe steel. The model can solve the magnetostatic, electrodynamic and elastic equations that give rise to acoustic wave generation, propagation and detection on the test material. The developed coupled finite element model was validated both analytically and experimentally to establish the validity of the finite element model. The analytical and experimental results obtained were consistent with the numerical result with an average discrepancy less than 9 % percent. Finally, the research developed a novel modelling strategy to decouple and quantify the various transduction forces in operation when normally-biased EMAT and magnetostrictive EMAT configurations are used on various grades of pipe steel materials. The strategy established the value of the critical excitation current beyond which acoustic wave is generated solely by the dynamic Lorentz force mechanism. The critical excitation currents when Magnetostrictive EMAT configurations are used to generate acoustic wave was found to be; 268A, 274A, 279A, 290A and 305A for CS70, L80SS, L80A, TN80Cr3 and J55 respectively. While for Normally-Biased EMAT configurations, the critical excitation current was found to be 190A, 205A, 240A, 160A and 200A respectively. This work also compared the critical excitation current of the two EMAT configurations studied and established that normally-biased EMATs are more efficient in the generation of acoustic waves than their magnetostrictive counterpart due to their lower value of critical excitation current.
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Li, Xin. "Eddy current techniques for non-destructive testing of carbon fibre reinforced plastic (CFRP)." Thesis, University of Manchester, 2012. https://www.research.manchester.ac.uk/portal/en/theses/eddy-current-techniques-for-nondestructive-testing-of-carbon-fibre-reinforced-plastic-cfrp(e8aa9a3f-108d-49a4-9f32-2e6118195898).html.

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AbstractThis thesis describes research on the use of eddy current techniques for nondestructivetesting of carbon fibre reinforced plastic (CFRP). The research hasinvolved bulk conductivity testing, fibre direction characterization and 3D FEMmodeling of the CFPR and eddy current probes geometry. In the conductivity testing,how the sample thickness, fibre volume content and fibre conductivity affects thesignal from the eddy current has been evaluated. Eddy current testing shows gooddirectionality as CFRP is an anisotropic material, thus is very suitable to characterizethe fibre orientation. Direction sensitive probes have been developed and tested toreveal information about the fibre direction and layer. Computer FEM software hasbeen used to analyze the magnetic field inside the sample and probes. Specific probegeometries have been designed depending on the electrical properties of thecomposites and testing requirement. The experiment, simulation and analysis resultsshow very good agreement. However, when the measuring frequency increases, noisesand parasitic capacitance inevitably become significant and have a negative influenceon the results. Improvements and further research are proposed which are believed tomake eddy-current techniques a more feasible and efficient measurement method, willcontribute to the development and maintenance of light weight CFRP composites.
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Fletcher, Adam. "Non-destructive testing of the graphite core within an advanced gas-cooled reactor." Thesis, University of Manchester, 2014. https://www.research.manchester.ac.uk/portal/en/theses/nondestructive-testing-of-the-graphite-core-within-an-advanced-gascooled-reactor(3ca5c904-6860-46b8-8538-4136cb2aedcd).html.

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The aim of this work has been to apply the techniques of non-destructive testing and evaluation to the graphite fuel channel bricks which form the core of an Advanced Gas-Cooled reactor. Two modes of graphite degradation have been studied: subsurface cracks originating from the keyway corners of the bricks and the reduction in material density caused by radiolytic oxidation. This work has focused on electromagnetic inspection techniques. Brick cracking has been studied using a multi-frequency eddy current technique with the aim of determining quantitative information. In order to accurately control the crack dimensions this work has used radially machined slots as an analogue. Two sensor geometries were studied and it was determined that slots of at least 10 mm through-wall extent could be located. A novel, empirical method of determining the slot size is presented using a brick machined with a series of reference slots. Machined slots originating from a keyway could be sized to within 2 mm using this method. A parametric 3D finite element study was also carried out on this problem. These simulations could distinguish the location of the slots and had some sensitivity to their size, however, the model was found to be overly sensitive to the specific mesh used. Two new contributions to the inverse problem are presented. The first is a minor extension to the usual adjoint problem in which one system now contains a gradiometer. The second is a proposed solution to the ambiguous nature of the inner product required by the sensitivity formulation. This solution has been validated with finite element modelling. Density reduction has been studied via its relationship with electrical conductivity using a technique based on impedance spectroscopy. An inverse eddy current problem has been solved using the regularised Gauss-Newton method to determine the conductivity of the brick over its cross section. The associated forward problem has been solved using the finite element method on a simplified geometry. Tikhonov regularisation has been employed to overcome the ill-posed nature of the inverse problem. This method has been applied to a range of sample and sensor geometries and found to produce excellent results from laboratory data provided the finite element model is well calibrated. Bore or surface conductivity values can be reproduced to better than 1% with the accuracy reducing with distance from the sensor. The sensitivity of the algorithm to the regularisation parameter has been studied using the L-curve method and the effect of two regularisation operators has also been examined. A new method of choosing the regularisation parameter a priori is proposed and tested. Data taken during reactor outages produces physically realistic profiles although the results appear off-set from electrical resistivity values measured using the four-point method. The focus of future work should be to remove this effect which will likely require improvements to the forward model.
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ALENCAR, DONIZETE A. de. "Avaliacao de integridade de revestimentos de combustiveis de reatores de pesquisa e teste de materiais utilizando o ensaio de correntes parasitas." reponame:Repositório Institucional do IPEN, 2004. http://repositorio.ipen.br:8080/xmlui/handle/123456789/11236.

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Made available in DSpace on 2014-10-09T12:49:48Z (GMT). No. of bitstreams: 0<br>Made available in DSpace on 2014-10-09T14:03:09Z (GMT). No. of bitstreams: 1 09810.pdf: 7314670 bytes, checksum: 5232e1c4a6554def247601f9a049ba1f (MD5)<br>Tese (Doutoramento)<br>IPEN/T<br>Instituto de Pesquisas Energeticas e Nucleares - IPEN/CNEN-SP
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Heideklang, René. "Data Fusion for Multi-Sensor Nondestructive Detection of Surface Cracks in Ferromagnetic Materials." Doctoral thesis, Humboldt-Universität zu Berlin, 2018. http://dx.doi.org/10.18452/19586.

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Ermüdungsrissbildung ist ein gefährliches und kostenintensives Phänomen, welches frühzeitig erkannt werden muss. Weil kleine Fehlstellen jedoch hohe Testempfindlichkeit erfordern, wird die Prüfzuverlässigkeit durch Falschanzeigen vermindert. Diese Arbeit macht sich deshalb die Diversität unterschiedlicher zerstörungsfreier Oberflächenprüfmethoden zu Nutze, um mittels Datenfusion die Zuverlässigkeit der Fehlererkennung zu erhöhen. Der erste Beitrag dieser Arbeit in neuartigen Ansätzen zur Fusion von Prüfbildern. Diese werden durch Oberflächenabtastung mittels Wirbelstromprüfung, thermischer Prüfung und magnetischer Streuflussprüfung gewonnen. Die Ergebnisse zeigen, dass schon einfache algebraische Fusionsregeln gute Ergebnisse liefern, sofern die Daten adäquat vorverarbeitet wurden. So übertrifft Datenfusion den besten Einzelsensor in der pixelbasierten Falscherkennungsrate um den Faktor sechs bei einer Nutentiefe von 10 μm. Weiterhin wird die Fusion im Bildtransformationsbereich untersucht. Jedoch werden die theoretischen Vorteile solcher richtungsempfindlichen Transformationen in der Praxis mit den vorliegenden Daten nicht erreicht. Nichtsdestotrotz wird der Vorteil der Fusion gegenüber Einzelsensorprüfung auch hier bestätigt. Darüber hinaus liefert diese Arbeit neuartige Techniken zur Fusion auch auf höheren Ebenen der Signalabstraktion. Ein Ansatz, der auf Kerndichtefunktionen beruht, wird eingeführt, um örtlich verteilte Detektionshypothesen zu integrieren. Er ermöglicht, die praktisch unvermeidbaren Registrierungsfehler explizit zu modellieren. Oberflächenunstetigkeiten von 30 μm Tiefe können zuverlässig durch Fusion gefunden werden, wogegen das beste Einzelverfahren erst Tiefen ab 40–50 μm erfolgreich auffindet. Das Experiment wird auf einem zweiten Prüfkörper bestätigt. Am Ende der Arbeit werden Richtlinien für den Einsatz von Datenfusion gegeben, und die Notwendigkeit einer Initiative zum Teilen von Messdaten wird betont, um zukünftige Forschung zu fördern.<br>Fatigue cracking is a dangerous and cost-intensive phenomenon that requires early detection. But at high test sensitivity, the abundance of false indications limits the reliability of conventional materials testing. This thesis exploits the diversity of physical principles that different nondestructive surface inspection methods offer, by applying data fusion techniques to increase the reliability of defect detection. The first main contribution are novel approaches for the fusion of NDT images. These surface scans are obtained from state-of-the-art inspection procedures in Eddy Current Testing, Thermal Testing and Magnetic Flux Leakage Testing. The implemented image fusion strategy demonstrates that simple algebraic fusion rules are sufficient for high performance, given adequate signal normalization. Data fusion reduces the rate of false positives is reduced by a factor of six over the best individual sensor at a 10 μm deep groove. Moreover, the utility of state-of-the-art image representations, like the Shearlet domain, are explored. However, the theoretical advantages of such directional transforms are not attained in practice with the given data. Nevertheless, the benefit of fusion over single-sensor inspection is confirmed a second time. Furthermore, this work proposes novel techniques for fusion at a high level of signal abstraction. A kernel-based approach is introduced to integrate spatially scattered detection hypotheses. This method explicitly deals with registration errors that are unavoidable in practice. Surface discontinuities as shallow as 30 μm are reliably found by fusion, whereas the best individual sensor requires depths of 40–50 μm for successful detection. The experiment is replicated on a similar second test specimen. Practical guidelines are given at the end of the thesis, and the need for a data sharing initiative is stressed to promote future research on this topic.
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Books on the topic "Pulsed eddy-current nondestructive testing"

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Hagemaier, Donald J. Fundamentals of eddy current testing. American Society for Nondestructive Testing, 1990.

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Theodoulidis, Theodoros P. Eddy current canonical problems (with applications to nondestructive evaluation). Tech Science Press, 2006.

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International, Workshop on Electromagnetic Nondestructive Evaluation (6th 2001 Budapest Hungary). Electromagnetic nondestructive evaluation (V). IOS, 2001.

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Inc, ebrary. Electromagnetic nondestructive evaluation (XIV). IOS Press, 2011.

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Cartz, Louis. Nondestructive testing: Radiography, ultrasonics, liquid penetrant, magnetic particle, eddy current. ASM International, 1995.

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Zoofan, Bahman. Radiographic testing lecture guide: RT. American Society for Nondestructive Testing, 2007.

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Sabbagh, Harold A. Computational Electromagnetics and Model-Based Inversion: A Modern Paradigm for Eddy-Current Nondestructive Evaluation. Springer New York, 2013.

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He, Yunze, Bin Gao, Ali Sophian, and Ruizhen Yang. Transient Electromagnetic-Thermal Nondestructive Testing: Pulsed Eddy Current and Transient Eddy Current Thermography. Elsevier Science & Technology Books, 2017.

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Eddy current testing. GP Courseware, 1987.

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R, Collins, and International Workshop on Electromagnetic Nondestructive Evaluation (1st : 1995 : London, England), eds. Nondestructive testing of materials. IOS Press, 1995.

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Book chapters on the topic "Pulsed eddy-current nondestructive testing"

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Crostack, H. A., W. Bischoff, and J. Nehring. "Nondestructive Testing of Forged Components Using CS-pulsed Eddy-current Technique." In Nondestructive Characterization of Materials. Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-84003-6_68.

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Chen, Zhenmao, Cherdpong Jomdecha, and Shejuan Xie. "Eddy Current Testing." In Handbook of Advanced Nondestructive Evaluation. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-26553-7_40.

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Huang, Songling, and Shen Wang. "The Pulsed Eddy Current Testing." In New Technologies in Electromagnetic Non-destructive Testing. Springer Singapore, 2016. http://dx.doi.org/10.1007/978-981-10-0578-7_2.

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Brauer, Hartmut, and Marek Ziolkowski. "Motion-Induced Eddy Current Testing." In Handbook of Advanced Nondestructive Evaluation. Springer International Publishing, 2019. http://dx.doi.org/10.1007/978-3-319-26553-7_25.

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Beissner, R. E., J. H. Rose, and N. Nakagawa. "Pulsed Eddy Current Method: an Overview." In Review of Progress in Quantitative Nondestructive Evaluation. Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-4791-4_59.

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Fisher, J. L., and R. E. Beissner. "Pulsed Eddy-Current Crack-Characterization Experiments." In Review of Progress in Quantitative Nondestructive Evaluation. Springer US, 1986. http://dx.doi.org/10.1007/978-1-4615-7763-8_21.

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Bowler, J. R. "Pulsed Eddy-Current Interaction with Subsurface Cracks." In Review of Progress in Quantitative Nondestructive Evaluation. Springer US, 1999. http://dx.doi.org/10.1007/978-1-4615-4791-4_60.

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Dobmann, Gerd, Kurt Betzold, and Paul Höller. "Recent Developments in Eddy Current Testing." In Review of Progress in Quantitative Nondestructive Evaluation. Springer US, 1985. http://dx.doi.org/10.1007/978-1-4615-9421-5_44.

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Podney, Walter, and John Moulder. "Electromagnetic Microscope for Deep, Pulsed, Eddy Current Inspections." In Review of Progress in Quantitative Nondestructive Evaluation. Springer US, 1997. http://dx.doi.org/10.1007/978-1-4615-5947-4_135.

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Beissner, R. E., and J. L. Fisher. "A Model of Pulsed Eddy Current Crack Detection." In Review of Progress in Quantitative Nondestructive Evaluation. Springer US, 1986. http://dx.doi.org/10.1007/978-1-4615-7763-8_20.

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Conference papers on the topic "Pulsed eddy-current nondestructive testing"

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Brown, D. J. "Massively Multiplexed Eddy Current Testing and its Comparison with Pulsed Eddy Current Testing." In QUANTITATIVE NONDESTRUCTIVE EVALUATION. AIP, 2004. http://dx.doi.org/10.1063/1.1711649.

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Jiabao, Cai, and Wang Haibo. "PULSE EDDY CURRENT NONDESTRUCTIVE TESTING." In International Conference on New Materials and Intelligent Manufacturing (ICNMIM). Volkson Press, 2018. http://dx.doi.org/10.26480/icnmim.01.2018.351.353.

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Peng, Jianping, Guiyun Tian, Li Wang, Xiaorong Gao, Yu Zhang, and Zeyong Wang. "Rolling contact fatigue detection using eddy current pulsed thermography." In 2014 IEEE Far East Forum on Nondestructive Evaluation/Testing (FENDT). IEEE, 2014. http://dx.doi.org/10.1109/fendt.2014.6928257.

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Li, Kongjing, and Gui Yun Tian. "Emissivity-adjusted based depth profiling in eddy current pulsed thermography." In 2014 IEEE Far East Forum on Nondestructive Evaluation/Testing (FENDT). IEEE, 2014. http://dx.doi.org/10.1109/fendt.2014.6928261.

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Liu, Jia, Wenwei Ren, Gui Yun Tian, Bin Gao, Jin Song Meng, and Yizhe Wang. "Early contact fatigue evaluation of gear using eddy current pulsed thermography." In 2014 IEEE Far East Forum on Nondestructive Evaluation/Testing (FENDT). IEEE, 2014. http://dx.doi.org/10.1109/fendt.2014.6928264.

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Tian, Gui Yun, Aijun Yin, Bin Gao, Jishan Zhang, and Brian Shaw. "Eddy current pulsed thermography for fatigue evaluation of gear." In 40TH ANNUAL REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION: Incorporating the 10th International Conference on Barkhausen Noise and Micromagnetic Testing. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4865022.

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Gao, Bin, Libing Bai, W. L. Woo, Gui Yun Tian, and Yuhua Cheng. "Single channel blind source separation for defect identification using Eddy Current Pulsed Thermography." In 2013 Far East Forum on Nondestructive Evaluation/Testing: New Technology & Application (FENDT). IEEE, 2013. http://dx.doi.org/10.1109/fendt.2013.6635536.

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Jialong Wu, Deqiang Zhou, Jun Wang, et al. "Surface crack detection for carbon fiber reinforced plastic (CFRP) materials using pulsed eddy current testing." In 2014 IEEE Far East Forum on Nondestructive Evaluation/Testing (FENDT). IEEE, 2014. http://dx.doi.org/10.1109/fendt.2014.6928258.

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Li, Yong, Xiangbiao Liu, Yong Qi, and Zhenmao Chen. "Efficient analytical modelling for Pulsed Remote Field Eddy Current evaluation of stratified tubular structures." In 2013 Far East Forum on Nondestructive Evaluation/Testing: New Technology & Application (FENDT). IEEE, 2013. http://dx.doi.org/10.1109/fendt.2013.6635521.

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Shin, Young-Kil. "Design of encircling send-receive type pulsed eddy current probe." In 40TH ANNUAL REVIEW OF PROGRESS IN QUANTITATIVE NONDESTRUCTIVE EVALUATION: Incorporating the 10th International Conference on Barkhausen Noise and Micromagnetic Testing. AIP Publishing LLC, 2014. http://dx.doi.org/10.1063/1.4864985.

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