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Modelisation Et Etude Numerique De La Fissuration Lente Des Ceramiques
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Book Synopsis Modélisation et étude numérique de la fissuration lente des céramiques by : Bassem El Zoghbi
Download or read book Modélisation et étude numérique de la fissuration lente des céramiques written by Bassem El Zoghbi and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Les céramiques sont sensibles à la fissuration lente qui résulte de l'effet conjoint entre un chargement mécanique et l'environnement (taux d'humidité et température). A partir d'études atomistiques disponibles dans la littérature, un modèle cohésif représentant localement la rupture assistée par l'environnement est proposé dans le cadre d'une formulation thermiquement activée. Nous montrons que cette description est capable de rendre compte de la fissuration lente en fatigue statique de monocristaux de céramiques, ainsi que la fissuration lente intergranulaire de polycristaux. Nous soulignons qu'une représentation de la fissuration lente avec la vitesse de propagation V en fonction du taux de restitutions d'énergie G rend compte des caractéristiques intrinsèques de la cinétique de rupture et est préférable à une présentation V-K. Le modèle cohésif permettant d'incorporer une longueur caractéristique dans la description, des effets de taille de grains sont explorés. La prise en compte des contraintes initiales d'origine thermique liées à l'élaboration est nécessaire pour prédire de manière réaliste l'accroissement du seuil de chargement en-dessous duquel aucune propagation n'a lieu ainsi que la résistance à la fissuration lente avec la taille de grains augmentant. La vitesse fissuration lente et le seuil de chargement K0 sont sensibles à l'environnement et notamment à la température et à la concentration d'eau. En augmentant la concentration d'eau et/ou la température, le seuil K0 diminue et la vitesse de fissuration lente augmente. Pour rendre compte de l'influence du taux d'humidité sur la fissuration lente, il est nécessaire de considérer une énergie d'activation ainsi qu'un seuil d'amorçage du mécanisme de réaction-rupture diminuant avec la concentration locale en eau. L'effet de la température est prédit de manière réaliste avec le modèle cohésif proposé et en tenant compte des contraintes initiales thermiques. Nous avons comparé les réponses en fissuration lente de l'alumine et de la zircone et montré qu'intrinsèquement et en l'absence de transformation de phase, la zircone résiste mieux à la fissuration lente que l'alumine. A partir de ces résultats, nous avons abordé l'étude de la fissuration lente de céramiques élaborées par projection plasma. Un endommagement initial de la microstructure à l'échelle des splats est observé sans qu'il n'influence la fissuration lente intra-splats en termes V-G.
Book Synopsis Modélisation de la fissuration lente d'une céramique technique de type ferrite by : Marc Romero de la Osa
Download or read book Modélisation de la fissuration lente d'une céramique technique de type ferrite written by Marc Romero de la Osa and published by . This book was released on 2009 with total page 155 pages. Available in PDF, EPUB and Kindle. Book excerpt: Même s'ils ont été moins étudiés, les ferrites sont sensibles à la rupture différée dans le temps. Le processus de fissuration lente est caractérisé par une vitesse de propagation de fissure V qui augmente avec le niveau de chargement appliqué KI, De plus, la fissuration lente caractérisée par des courbes V-K est dépendante de la microstructure, notamment de la taille de grain, voire de la présence de défauts comme des porosités aux points triples. Les ferrites auxquels nous nous intéressons possèdent une microstructure hétérogène vis à vis de la taille des grains, avec des pores aux points triples. Une telle microstructure conduit à une dispersion des mesures de fissuration lente V-K telle, qu’aucune prédictions fiables de durée de vie est possible à partir d'études expérimentales uniquement. Le recours à la simulation s'avère nécessaire à la fois pour élucider l'influence de la microstructure sur la rupture différée dans le temps et in fine pour estimer la durabilité du matériau. Nous avons développé une description locale de la fissuration lente, à l'échelle de la microstructure. Dans le cadre d'une méthodologie des zones cohésives, à partir des observations et descriptions physico-chimiques disponibles et de calculs atomistiques récents, nous proposons un modèle cohésif viscoplastique pour mimer le mécanisme de réaction-rupture responsable de la fissuration lente. La description permet d'estimer des variations V-K conformes aux observations. Dans les simulations de la rupture intergranulaire des polycristaux pour un chargement de fatigue statique, nous observons que l'avancée de la fissure est discontinue dans le temps avec des vitesses différentes selon l'orientation des grains. Le franchissement des points triples ralentit la progression de la fissure. Nous montrons qu'il est nécessaire de tenir compte des contraintes d'origine thermique pour prédire une influence de la taille des grains.
Book Synopsis ETUDE NUMERIQUE DE LA PROPAGATION DE FISSURES PAR LA MECANIQUE DE LA RUPTURE by : XIA-BING.. ZHANG
Download or read book ETUDE NUMERIQUE DE LA PROPAGATION DE FISSURES PAR LA MECANIQUE DE LA RUPTURE written by XIA-BING.. ZHANG and published by . This book was released on 1992 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: L'OBJET DE CETTE THESE EST D'APPORTER UNE CONTRIBUTION A L'ETUDE NUMERIQUE PAR LA MECANIQUE DE LA RUPTURE, DE LA PROPAGATION ET DE LA BIFURCATION DES FISSURES EXISTANT DANS DES STRUCTURES FORMEES D'UNE OU PLUSIEURS COUCHES DE MATERIAUX ET DE PROPOSER UNE METHODOLOGIE POUR SIMULER L'EVOLUTION DE FISSURE (EN MODE MIXTE) JUSQU'A LA RUINE DE LA STRUCTURE ETUDIEE. L'ETUDE COMPORTE QUATRE PARTIES. LA PREMIERE PARTIE EST UNE ETUDE BIBLIOGRAPHIQUE SUR LA MECANIQUE DE LA RUPTURE. DANS LA DEUXIEME PARTIE, UNE ANALYSE COMPARATIVE ENTRE LES METHODES NUMERIQUES ACTUELLEMENT UTILISEES POUR DETERMINER LES PARAMETRES DE FISSURATION PERMET DE CARACTERISER CHAQUE METHODE, COMPTE TENU DE LEURS POSSIBILITES D'APPLICATION AUX CAS DE MATERIAUX HOMOGENES ET DE BI-MATERIAUX. LA TROISIEME PARTIE EST CONSACREE A DEUX NOUVELLES METHODES NUMERIQUES: LES METHODES DES INTEGRALES T ET A, QUI PERMETTENT DE SEPARER PLUS FACILEMENT LES DEUX MODES DE RUPTURE. LA VALIDATION NUMERIQUE DE LA METHODE DE L'INTEGRALE A MONTRE LE GRAND INTERET DE CETTE METHODE. LA DERNIERE PARTIE CONCERNE L'ETUDE DE LA PROPAGATION ET DE LA BIFURCATION DE FISSURES. LA SIMULATION NUMERIQUE DE L'EVOLUTION DE FISSURE EST EFFECTUEE SUR DES EXEMPLES DIFFERENTES. LES RESULTATS NUMERIQUES OBTENUS SONT CONFIRMES PAR DES RESULTATS EXPERIMENTAUX. L'ANALYSE DE L'INTERACTION DE DEUX FISSURES PERMET DE CERNER LA ZONE D'INFLUENCE SUR LA DIRECTION DE PROPAGATION DE CELLES-CI. LA NON-NECESSITE D'UN MAILLAGE SYMETRIQUE AUTOUR DE LA POINTE DE FISSURE LORS D'UNE TELLE ETUDE CONFIRME TOUT L'INTERET DE LA METHODE DE L'INTEGRALE A
Book Synopsis ETUDE NUMERIQUE PAR ELEMENTS FINIS DE LA FISSURATION AVEC REMAILLAGE AUTOMATIQUE. APPLICATION A LA MECANIQUE DES CHAUSSEES by : AHMED.. ELOUARD
Download or read book ETUDE NUMERIQUE PAR ELEMENTS FINIS DE LA FISSURATION AVEC REMAILLAGE AUTOMATIQUE. APPLICATION A LA MECANIQUE DES CHAUSSEES written by AHMED.. ELOUARD and published by . This book was released on 1993 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: CETTE THESE TRAITE DE L'UTILISATION DE LA MECANIQUE DE LA RUPTURE DANS LE CADRE DU CALCUL PAR ELEMENTS FINIS. LE PREMIER OBJECTIF DE CE TRAVAIL EST DE DEVELOPPER LES TECHNIQUES NUMERIQUES NECESSAIRES A LA MODELISATION DE LA PROPAGATION DE LA FISSURATION SOUS MODE MIXTE. LE SECOND OBJECTIF ETANT DE CREER UN OUTIL PERMETTANT LA SIMULATION NUMERIQUE DE LA PROPAGATION DE LA FISSURATION DANS UN SYSTEME ELASTIQUE BIDIMENSIONNEL. CE TRAVAIL EST CONCRETISE PAR L'IMPLANTATION AU SEIN DU PROGICIEL CESAR-LCPC D'UN CODE PERMETTANT L'ANALYSE ET LA DISCUSSION DU PROBLEME DE LA PROPAGATION DE LA FISSURATION. LES PROBLEMES ABORDES SONT LE CALCUL NUMERIQUE DES QUANTITES LOCALES ET GLOBALES RELATIVES A LA PRESENCE D'UNE FISSURE DANS UNE STRUCTURE ET A SA PROPAGATION, LA CONSTRUCTION D'UN MAILLAGE APPROPRIE A LA REPRESENTATION DES CHAMPS SINGULIERS ET SON EVOLUTION AU FUR ET A MESURE DE LA PROPAGATION. LE CAS DE STRUCTURES MULTICOUCHES EST ABORDE. L'ETUDE DES CHAMPS DE CONTRAINTE POUR UNE FISSURE SITUEE PARALLELEMENT ET PERPENDICULAIREMENT A UNE INTERFACE EST TRAITEE SUR LE PLAN THEORIQUE ET NUMERIQUE. CE MEMOIRE COMPORTE UNE SERIE D'ANALYSES SUR DES CAS TESTS VARIES: 1) ESSAI DE FENDAGE SUR UNE ROCHE, 2) FISSURATION EN FATIGUE D'UN PROFILE METALLIQUE, 3) POUTRES EN FLEXION TROIS ET QUATRE POINTS
Book Synopsis La simulation numérique de la propagation des fissures by : Sylvie Pommier
Download or read book La simulation numérique de la propagation des fissures written by Sylvie Pommier and published by . This book was released on 2009 with total page 240 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Terra 2008 written by Leslie Rainer and published by Getty Publications. This book was released on 2011-06-14 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt: Earthen architecture constitutes one of the most diverse forms of cultural heritage and one of the most challenging to preserve. It dates from all periods and is found on all continents but is particularly prevalent in Africa, where it has been a building tradition for centuries. Sites range from ancestral cities in Mali to the palaces of Abomey in Benin, from monuments and mosques in Iran and Buddhist temples on the Silk Road to Spanish missions in California. This volume's sixty-four papers address such themes as earthen architecture in Mali, the conservation of living sites, local knowledge systems and intangible aspects, seismic and other natural forces, the conservation and management of archaeological sites, research advances, and training.
Book Synopsis Dislocations, Mesoscale Simulations and Plastic Flow by : Ladislas Kubin
Download or read book Dislocations, Mesoscale Simulations and Plastic Flow written by Ladislas Kubin and published by OUP Oxford. This book was released on 2013-04-18 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the past twenty years, new experimental approaches, improved models and progress in simulation techniques brought new insights into long-standing issues concerning dislocation-based plasticity in crystalline materials. During this period, three-dimensional dislocation dynamics simulations appeared and reached maturity. Their objectives are to unravel the relation between individual and collective dislocation processes at the mesoscale, to establish connections with atom-scale studies of dislocation core properties and to bridge, in combination with modelling, the gap between defect properties and phenomenological continuum models for plastic flow. Dislocation dynamics simulations are becoming accessible to a wide range of users. This book presents to students and researchers in materials science and mechanical engineering a comprehensive coverage of the physical body of knowledge on which they are based. It includes classical studies, which are too often ignored, recent experimental and theoretical advances, as well as a discussion of selected applications on various topics.
Book Synopsis Basic Technics in Ecological Farming / Techniques de Base en Agriculture Biologique / Grundsätzliche Verfahren der ökologischen Landwirtschaft / Le Maintien de la Fertilité des Sols / The Maintenance of Soil Fertility / Die Erhaltung der Bodenfruchtbarkeit by : Stuart Hill
Download or read book Basic Technics in Ecological Farming / Techniques de Base en Agriculture Biologique / Grundsätzliche Verfahren der ökologischen Landwirtschaft / Le Maintien de la Fertilité des Sols / The Maintenance of Soil Fertility / Die Erhaltung der Bodenfruchtbarkeit written by Stuart Hill and published by Birkhäuser. This book was released on 2013-12-14 with total page 364 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :International Atomic Energy Agency Publisher :International Atomic Energy Agency ISBN 13 :9789201063205 Total Pages :72 pages Book Rating :4.0/5 (632 download)
Book Synopsis In-Vessel Melt Retention and Ex-Vessel Corium Cooling: IAEA Tecdoc No. 1906 by : International Atomic Energy Agency
Download or read book In-Vessel Melt Retention and Ex-Vessel Corium Cooling: IAEA Tecdoc No. 1906 written by International Atomic Energy Agency and published by International Atomic Energy Agency. This book was released on 2020-08-06 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt: This publication results from a technical meeting on phenomenology and technologies relevant to in-vessel melt retention (IVMR) and ex-vessel corium cooling (EVCC). The purpose of the publication is to capture the state of knowledge, at the time of that meeting, related to phenomenology and technologies as well as the challenges and pending issues relevant to IVMR and EVCC for water cooled reactors by summarizing the information provided by the meeting participants in a form useful to practitioners in Member States.
Book Synopsis Dynamic Behavior of Materials, Volume 1 by : Bo Song
Download or read book Dynamic Behavior of Materials, Volume 1 written by Bo Song and published by Springer. This book was released on 2015-10-23 with total page 265 pages. Available in PDF, EPUB and Kindle. Book excerpt: Dynamic Behavior of Materials, Volume 1 represents the first of nine volumes of technical papers presented at the Society for Experimental Mechanics SEM 15th International Congress & Exposition on Experimental and Applied Mechanics, held at Costa Mesa, California, June 8-11, 2015. The full set of proceedings also includes volumes on: Challenges in Mechanics of Time Dependent Materials, Advancement of Optical Methods in Experimental Mechanics, Experimental and Applied Mechanics 16th International Symposium on MEMS and Nanotechnology, 5th International Symposium on the Mechanics of Biological Systems and Materials, International Symposium on the Mechanics of Composite and Multi-functional Materials, Fracture, Fatigue, Failure and Damage Evolution; and Residual Stress, Thermomechanics & Infrared Imaging, Hybrid Techniques and Inverse Problems.
Download or read book Satellite Situation Report written by and published by . This book was released on 1978-12 with total page 132 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Solid-Earth Sciences and Society by : National Research Council
Download or read book Solid-Earth Sciences and Society written by National Research Council and published by National Academies Press. This book was released on 1993-02-01 with total page 369 pages. Available in PDF, EPUB and Kindle. Book excerpt: As environmental problems move upward on the public agenda, our knowledge of the earth's systems and how to sustain the habitability of our world becomes more critical. This volume reports on the state of earth science and outlines a research agenda, with priorities keyed to the real-world challenges facing human society. The product of four years of development with input from more than 200 earth-science specialists, the volume offers a wealth of historical background and current information on: Plate tectonics, volcanism, and other heat-generated earth processes. Evolution of our global environment and of life itself, as revealed in the fossil record. Human exploitation of water, fossil fuels, and minerals. Interaction between human populations and the earth's surface, discussing the role we play in earth's systems and the dangers we face from natural hazards such as earthquakes and landslides. This volume offers a comprehensive look at how earth science is currently practiced and what should be done to train professionals and adequately equip them to find the answers necessary to manage more effectively the earth's systems. This well-organized and practical book will be of immediate interest to solid-earth scientists, researchers, and college and high school faculty, as well as policymakers in the environmental arena.
Book Synopsis Flexoelectricity in Liquid Crystals by : Agnes Buka
Download or read book Flexoelectricity in Liquid Crystals written by Agnes Buka and published by World Scientific. This book was released on 2013 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: The book intends to give a state-of-the-art overview of flexoelectricity, a linear physical coupling between mechanical (orientational) deformations and electric polarization, which is specific to systems with orientational order, such as liquid crystals. Chapters written by experts in the field shed light on theoretical as well as experimental aspects of research carried out since the discovery of flexoelectricity. Besides a common macroscopic (continuum) description the microscopic theory of flexoelectricity is also addressed. Electro-optic effects due to or modified by flexoelectricity as well as various (direct and indirect) measurement methods are discussed. Special emphasis is given to the role of flexoelectricity in pattern-forming instabilities. While the main focus of the book lies in flexoelectricity in nematic liquid crystals, peculiarities of other mesophases (bent-core systems, cholesterics, and smectics) are also reviewed. Flexoelectricity has relevance to biological (living) systems and can also offer possibilities for technical applications. The basics of these two interdisciplinary fields are also summarized.
Author :John Henry Lorentz Publisher :Historical Dictionaries of Asia, Oceania, and the Middle East ISBN 13 : Total Pages :570 pages Book Rating :4.F/5 ( download)
Book Synopsis Historical Dictionary of Iran by : John Henry Lorentz
Download or read book Historical Dictionary of Iran written by John Henry Lorentz and published by Historical Dictionaries of Asia, Oceania, and the Middle East. This book was released on 2007 with total page 570 pages. Available in PDF, EPUB and Kindle. Book excerpt: Provides an overview of specific events, movements, people, political and social groups, places, trends, and chronology. Allows for considerable exploration of a number of historical and contemporary topics and issues. The modern period, defined as 1800-present, is covered extensively.
Download or read book Space Debris written by Heiner Klinkrad and published by Springer Science & Business Media. This book was released on 2006-09-01 with total page 438 pages. Available in PDF, EPUB and Kindle. Book excerpt: The future evolution of the debris environment will be forecast on the basis of traffic models and possible hazard mitigation practices. The text shows how large trackable objects will have re-entry pinpointed and predictions made on related risk assessment for possible ground impact. Models will also be described for meteoroids which are also a prevailing risk.
Book Synopsis David Adjaye's GEO-graphics by : David Adjaye
Download or read book David Adjaye's GEO-graphics written by David Adjaye and published by Silvana Editoriale. This book was released on 2010 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Confronting contemporary African art's awkward coexistence with earlier African art as "ethnographic artifact," Geo-Graphics celebrates the flourishing of African art on the international circuit, while simultaneously asserting its ancestry and critiquing the valorization of heritage. David Adjaye's photographs of African capitals and an examination of contemporary African art centers further contextualize the continent's recent cultural transformations.
Book Synopsis Nonlinear Optical Materials by : Jerome V. Moloney
Download or read book Nonlinear Optical Materials written by Jerome V. Moloney and published by Springer Science & Business Media. This book was released on 1998-08-13 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: Mathematical methods play a significant role in the rapidly growing field of nonlinear optical materials. This volume discusses a number of successful or promising contributions. The overall theme of this volume is twofold: (1) the challenges faced in computing and optimizing nonlinear optical material properties; and (2) the exploitation of these properties in important areas of application. These include the design of optical amplifiers and lasers, as well as novel optical switches. Research topics in this volume include how to exploit the magnetooptic effect, how to work with the nonlinear optical response of materials, how to predict laser-induced breakdown in efficient optical devices, and how to handle electron cloud distortion in femtosecond processes.
