Auswahl der wissenschaftlichen Literatur zum Thema „Essais par ultrasons – Simulation par ordinateur“
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Zeitschriftenartikel zum Thema "Essais par ultrasons – Simulation par ordinateur"
Foucher, Fabrice, Sébastien Lonné, Philippe Dubois, Stéphane Leberre, Pierre Calmon, Michael Enright und Yasin Zaman. „Apports d’une cosimulation “END – Tolérance aux dommages” dans la réduction des risques de rupture“. e-journal of nondestructive testing 28, Nr. 9 (September 2023). http://dx.doi.org/10.58286/28527.
Der volle Inhalt der QuelleDissertationen zum Thema "Essais par ultrasons – Simulation par ordinateur"
Verma, Ravi. „Interaction of ultrasonic waves with frictional defects in the context of nondestructive testing of materials“. Electronic Thesis or Diss., Université de Lille (2022-....), 2023. http://www.theses.fr/2023ULILN063.
Der volle Inhalt der QuelleThis thesis concerns theoretical concepts, models, and experiments for elastic wave propagation and vibrations in solids containing internal contacts (cracks, delaminations, etc.) having frictional nature. The study is oriented to nondestructive testing and therefore focuses on the case where the material contains few cracks of known configuration, in contrast to microcracked solids in which a statistical ensemble of a large number of internal contacts is present.An essential part of the work is related to a development of a method of numerical acoustics capable of imitating elastic waves in an environment containing frictional cracks/contacts. These planar defects represent a sort of inner boundaries at which appropriate boundary conditions should set. These boundary conditions are set using an original model for frictional interaction based on Cattaneo-Mindlin (or Hertz-Mindlin) mechanics in which two spheres are mechanically excited with an oblique force. The known solutions are extended to the case of rough surfaces and arbitrary in time oblique excitation.Another component of the numerical acoustics model we present here is a standard finite element description for elastic waves in solid materials (solid mechanics unit in a commercial FEM package). Some technical efforts have been made to integrate a user-defined contact model as a boundary condition into the solid mechanics unit. As a result, a complete model has been obtained that incorporates wave-induced contact frictional interactions described starting from first principles of contact mechanics.An essential progress in comparison to previous works is related to application of the elaborated model to a case that corresponds to a known technique of nonlinear acoustic nondestructive testing. The chosen technique is based on excitation of a sample with a harmonics wave that, after completion of a transient regime, results in a purely harmonic response of an intact sample, whereas the response of a damaged sample will present anharmonicity. The generated harmonics form its own standing wave pattern that can have a clear maximum around the defect. In practice, surface signal measurements are done via laser vibrometry; our modeling therefore represents an attempt to imitate laser vibromenry NDT experiment in geometrically simplified conditions, but fully adhering to its ideology.The simplified conditions are taken in a way that reduces the computation time. The most important assumption is a 2D geometry that immediately disables a quantitative comparison to experiment. Other simplifications are discussed below in greater detail. Keeping, however, the general methodology close to experimental principles we generate a large number of synthetic nonlinear images of an isolated crack immersed into a fragment of a solid plate. We analyze in detail influence of geometric and physical parameters of the system in the cases of one- and two-frequency excitations.Finally, we focus on the case close to real experimental conditions in terms of the sample geometry and boundary conditions selected. A preliminary theory and experiment comparison is presented.Generally, the results of this thesis could be of interest for researchers involved in nonlinear acoustic NDT experiments as well as for those who look for applications of modern semi-analytical contact models based on Cattaneo-Mindlin principles
Dridi, Samia. „Essais de caractérisation des structures tissées“. Lyon, INSA, 2010. http://theses.insa-lyon.fr/publication/2010ISAL0041/these.pdf.
Der volle Inhalt der QuelleIn this work, we interested to the study and the modelling of mechanical behaviour of weave structure. We begin by presenting the properties of tested materials thanks to tests of characterization. An experimental data base is established to analyze the mechanical behaviour of fabric under some solicitations, in particular the shear, using the technique of digital image correlation. Then, by adopting a hyperelastic approach, a simplified model is developed allowing to study numerically the influence of the report of tensile and shearing rigidities on the mechanical behaviour of woven fabric, further to an extension in 45. Finally, by basing on phenomenological approach, a hyperelastic behaviour law is proposed. This model is implanted in a routine Vumat. It is identified from the tensile and the shearing tests and validated by certain cases of composite reinforcement forming
Dautriat, Jérémie. „Comportement hydromécanique de roches réservoir sous contraintes : relations entre évolution de perméabilité et échelles des mécanismes d'endommagement“. Palaiseau, Ecole polytechnique, 2009. http://tel.archives-ouvertes.fr/docs/00/38/57/77/PDF/Manuscrit_These_Dautriat.pdf.
Der volle Inhalt der QuelleThe Understanding and the prevention of damage mechanisms, which have an impact on the kinetics of production and the rate of recovery, remain an outstanding issue in reservoir engineering. The aim of this study, based on the characterization of the hydromechanical behaviour of sandstone and carbonate rocks in 'reservoir conditions', is the identification of the local mechanisms responsible for changes in permeability measured macroscopically. The experimental work was performed with an original triaxial set-up, which allows measurements of the stress-induced permeability evolutions in the principal directions of the stress tensor. A first experimental campaign, consisting in hydrostatic and uniaxial compression tests, has been performed on Fontainebleau and Bentheim sandstones. In one hand, we showed that experimental end-effects might affect significantly the ‘classical' axial permeability measurements, and in the other hand, we have determined the impact of brittle failure on directional permeabilities. Compression experiments, following different stress-paths, were also carried out on a carbonate, the Estaillades limestone. In elastic deformation regime, the reduction of permeability was modelized by pore network simulations, based on 3D reconstructions of μ-tomography RX and a simplified representation of the pore space. While brittle fracture of carbonate samples induced slight permeability evolutions, at higher effective pressure, permeability drops can reach 90% to the initial values and are associated with mechanisms of pore collapse. The post-mortem analysis of deformed samples, coupled with digital image correlation methods, using both SEM and Optical acquisition devices, provide a better understanding of the role of the heterogeneities, identified at different scales, in the strain localization and their potential impacts on permeability changes at the sample scale
Rocher-Lacoste, Frédéric. „Etude expérimentale en vraie grandeur et étude numérique des pieux vibrofoncés : Vibrations dans l’Environnement et Capacité Portante“. Paris Est, 2008. http://pastel.paristech.org/5507/01/FRL-rapport_final.pdf.
Der volle Inhalt der QuelleThe objective of this work is to better understand the phenomena related to vibratory driving and to capitalize on it. This report is organized into three chapters. The first describes two techniques of driven piles: impact driving and vibratory driving. The second chapter is based on two axes : 1) A full scale experimental study of acoustic impact of sound and especially an analysis of noise caused by the driving piles with a vibrator, a hydraulic hammer or a pneumatic hammer, 2) A full scale experimental study of particulate velocity during pile driving, coupled with a numerical analysis (both in 2D and in 3D), with the finite element software package CESAR-LCPC. From full-scale experiments, the third chapter compares the bearing capacity of piles implemented by impact and vibratory driving and proposes to take into account the vibratory driving piles into the French rules
Gaudillière, Camille. „Cisaillage à grande vitesse : des essais à la simulation“. Paris, ENSAM, 2011. http://www.theses.fr/2011ENAM0052.
Der volle Inhalt der QuelleTo increase their productivity, blanking professionals are interested by an emerging process: the high speed blanking. For this process, the punch speed reaches10m/s whereas this speed does not exceed 0,1m/s for conventional blanking process. However, even if the quality of the obtained surfaces is close to those obtained with fine blanking, the occurence of hard dynamic phenomena makes difficult the deployment of the high speed blanking process. This work proposes to better control this process using experimentations and numerical simulations. An instrumented device has been designed to observe in detail the existing phenomenon during cutting. This device is similar to the industrial one. It includes a punch with non-constant sections and a matrix linked to an Hopkinson's tube in order to measure the blanking cutting forces. This measure requires a specific treatment to correct dynamic effects present in the matrix during the cutting. This treatment, which uses a calibration of the device, was validated thanks to a one-dimensional numerical model. Many observations made on the blanked surfaces have shown that adiabatic shear bands (ASB) can take place. A thermo-mechanical constitutive model (Johnson-Cook's law) of the C40 steel has been identified and used into simulations to reproduce real experimentations. The used simulation is based on a C-NEM approach (Constrained Natural Element Method). A comparative study between simulation and experimental results has been done. Results show a good correlation with experimental tests
Albach, Daniel. „Amplified Spontaneous Emission and Thermal Management on a High Average-Power Diode-Pumped Solid-State Laser – The Lucia Laser System“. Palaiseau, Ecole polytechnique, 2010. http://tel.archives-ouvertes.fr/docs/00/50/49/15/PDF/these_final.pdf.
Der volle Inhalt der QuelleOn trouve sur la plateforme de thèses en ligne Pastel le résumé suivant : The development of the laser triggered the birth of numerous fields in both scientific and industrial domains. High intensity laser pulses are a unique tool for light/matter interaction studies and applications. However, current flash-pumped glass-based systems are inherently limited in repetition-rate and efficiency. Development within recent years in the field of semiconductor lasers and gain media drew special attention to a new class of lasers, the so-called Diode Pumped Solid State Laser (DPSSL). DPSSLs are highly efficient lasers and are candidates of choice for compact, high average-power systems required for industrial applications but also as high-power pump sources for ultra-high intense lasers. The work described in this thesis takes place in the context of the 1 kilowatt average-power DPSSL program Lucia, currently under construction at the ‘Laboratoire d'Utilisation des Laser Intenses' (LULI) at the Ecole Polytechnique, France. Generation of sub-10 nanosecond long pulses with energies of up to 100 joules at repetition rates of 10 hertz are mainly limited by Amplified Spontaneous Emission (ASE) and thermal effects. These limitations are the central themes of this work. Their impact is discussed within the context of a first Lucia milestone, set around 10 joules. The developed laser system is shown in detail from the oscillator level to the end of the amplification line. A comprehensive discussion of the impact of ASE and thermal effects is completed by related experimental benchmarks. The validated models are used to predict the performances of the laser system, finally resulting in a first activation of the laser system at an energy level of 7 joules in a single-shot regime and 6. 6 joules at repetition rates up to 2 hertz. Limitations and further scaling approaches are discussed, followed by an outlook for the further development
Ledoux, Yann. „Optimisation des procédés d'emboutissage par caractérisation géométrique et essais numériques“. Phd thesis, Chambéry, 2005. http://tel.archives-ouvertes.fr/tel-00419320.
Der volle Inhalt der QuelleCollin, Jean-Marc. „Identifiabilité des paramètres de lois de comportement de matériaux par essais d’indentation continue“. Rennes 1, 2008. http://www.theses.fr/2008REN1S079.
Der volle Inhalt der QuelleThe aim of this thesis is to study the potential of indentation test in the determination of the materials behaviour laws parameters. From a study of the spherical indentation, some models describing indentation data changes were proposed. They allow a good evaluation of the stress-strain curve of several metallic samples by inversion. However, it has been observed that isotropic hardening is not sufficient to describe the unloading and reloading during an indentation test. Thus, models combining both isotropic and kinematic hardening were used in order to describe the whole indentation test. They depend on many parameters; an approach by inversion of models becomes then difficult. We then propose the use of inverse analysis approach on indentation tests in order to determine the parameters of these behaviour models
Bittencourt, Machado Christiano. „Suivi de la consolidation des fractures par transmission axiale ultrasonore : effet de la composition et de la minéralisation du cal osseux“. Paris 6, 2011. http://www.theses.fr/2011PA066450.
Der volle Inhalt der QuelleChen, Yu. „Contribution à l'optimisation de l'aisance d'un vêtement par les techniques de calcul avancé“. Lille 1, 2006. http://www.theses.fr/2006LIL10020.
Der volle Inhalt der QuelleBücher zum Thema "Essais par ultrasons – Simulation par ordinateur"
Sivertsen, Ole Ivar, und Bjorn Haugen. Automation in the Virtual Testing of Mechanical Systems: Theories and Implementation Techniques. Taylor & Francis Group, 2018.
Den vollen Inhalt der Quelle findenSivertsen, Ole Ivar, und Bjorn Haugen. Automation in the Virtual Testing of Mechanical Systems: Theories and Implementation Techniques. Taylor & Francis Group, 2018.
Den vollen Inhalt der Quelle findenJorgensen, Paul C. Craft of Model-Based Testing. Taylor & Francis Group, 2017.
Den vollen Inhalt der Quelle findenJorgensen, Paul C. Craft of Model-Based Testing. Auerbach Publishers, Incorporated, 2017.
Den vollen Inhalt der Quelle findenJorgensen, Paul C. Craft of Model-Based Testing. Auerbach Publishers, Incorporated, 2017.
Den vollen Inhalt der Quelle findenJorgensen, Paul C. Craft of Model-Based Testing. Auerbach Publishers, Incorporated, 2017.
Den vollen Inhalt der Quelle findenJorgensen, Paul C. Craft of Model-Based Testing. Auerbach Publishers, Incorporated, 2017.
Den vollen Inhalt der Quelle findenStreibig, Jens Carl, Christian Ritz, Signe Marie Jensen und Daniel Gerhard. Dose-Response Analysis Using R. Taylor & Francis Group, 2019.
Den vollen Inhalt der Quelle findenStreibig, Jens Carl, Christian Ritz, Signe Marie Jensen und Daniel Gerhard. Dose-Response Analysis Using R. Taylor & Francis Group, 2019.
Den vollen Inhalt der Quelle findenStreibig, Jens Carl, Christian Ritz, Signe Marie Jensen und Daniel Gerhard. Dose-Response Analysis Using R. Chapman and Hall/CRC, 2021.
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