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Rupture De Structures Composites Stratifiees Sous Chargements Statique Et De Fatigue
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Book Synopsis Rupture de structures composites stratifiées sous chargements statique et de fatigue by : Stéphanie Miot
Download or read book Rupture de structures composites stratifiées sous chargements statique et de fatigue written by Stéphanie Miot and published by . This book was released on 2009 with total page 115 pages. Available in PDF, EPUB and Kindle. Book excerpt: L’utilisation des matériaux composites est en plein essor depuis quelques années, notamment dans le secteur aéronautique. C’est dans le cadre d’un partenariat avec Eurocopter que s’inscrivent ces travaux de thèse visant à analyser expérimentalement et à modéliser le comportement jusqu’à rupture de structures composites stratifiées sous chargements statique et de fatigue. Pour décrire le comportement mécanique des matériaux composites, plusieurs mécanismes de dégradation sont à considérer. Un modèle, basé sur la Mécanique de l’Endommagement, a récemment été développé au LMA. Il traduit les effets des endommagements transverse et de cisaillement, se caractérisant par la formation de petites fissures évoluant le long des fibres. Ce modèle a été intégré dans le code de calcul Abaqus/Standard afin d’étudier le comportement de structures stratifiées soumises à un chargement statique ou de fatigue. Les comparaisons essais / simulation ayant mis en évidence le fait que les critères de rupture classiques ne fonctionnent pas si le champ de déformation n’est pas homogène, une approche non locale a été développé. Basée sur un Volume Caractéristique de Rupture, elle permet de prendre en compte l’effet des concentrations de contraintes pour décrire la rupture de structures stratifiées. Une confrontation expérimentale a permis de valider le modèle de comportement associé à l’approche non locale pour divers matériaux, stratifiés et géométries pour des cas de chargements statiques. L’application aux cas de chargements de fatigue est encore à l’étude. Toutefois, les premières comparaisons entre les résultats de simulations et les essais sont encourageants.
Book Synopsis Étude de la tolérance aux dommages d'impact sur structure composite en zone de reprise de plis by : Hakim Abdulhamid
Download or read book Étude de la tolérance aux dommages d'impact sur structure composite en zone de reprise de plis written by Hakim Abdulhamid and published by . This book was released on 2015 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: La tenue résiduelle à l'impact basse vitesse est un critère dimensionnant des structures composites minces pour l'aéronautique. La majorité des travaux réalisés jusqu'ici porte sur l'analyse du comportement en zone courante. Ce travail élargit le domaine d'étude aux zones de variation d'épaisseur. L'objectif est d'étudier la tolérance aux dommages d'impact d'un stratifié comportant une zone de reprise de plis (ZRP) dans le cadre d'un dialogue essai/ calcul, en menant en parallèle une campagne d'essais expérimentaux et l'adaptation d'un modèle numérique de l'endommagement des composites.Le volet expérimental étudie successivement l'impact, la compression et la fatigue à R=-l après impact (CAI et FAI) d'éprouvettes comportant une ZRP. L'analyse des essais d'impact a permis d'identifier la résistance à l'impact et le mécanisme d'endommagement des éprouvettes. Ensuite, un outillage d'essai adapté à la géométrie des éprouvettes a été conçu pour les essais de CAI et de FAI. Les essais de compression montrent une tenue résiduelle statique après impact similaire à celle des éprouvettes sans perte de plis. Les essais de fatigue menés à 60 070 de la tenue résiduelle statique montrent une propagation des délaminages d'impact (en dessous du BVID) qui mène à la rupture des éprouvettes pour un nombre de cycles relativement faible. Alors que la tolérance aux dommages d'impact des ZRP sous chargement statique est comparable à celle des zones courantes lisses, on constate une forte vulnérabilité de ces zones sous chargement de fatigue.Le volet numérique a permis de tester l'approche DPM (Discrete Ply Model), développé lors de travaux précédents, sur une configuration particulière. Un maillage spécifique a été réalisé pour tenir compte des discontinuités de la ZRP. Au niveau de la loi matériau, une formulation unifiée de la rupture de fibres en traction/compression a été implémentée. Les résultats de la simulation d'impact sont en bonne corrélation avec les données expérimentales. Le modèle est capable de prédire la réponse globale de l'éprouvette ainsi que l'étendu des dommages internes. La modélisation de la CAI a permis de confirmer les mécanismes de rupture identifiés lors des essais. Ces résultats numériques sont remarquables puisqu' aucune modélisation locale particulière n'a été faite pour les arrêts de plis. L'approche DPM s'est révélée suffisamment robuste et bien adaptée à la modélisation de l'endommagement des stratifiés unidirectionnels.
Book Synopsis SME Technical Paper by : Society of Manufacturing Engineers
Download or read book SME Technical Paper written by Society of Manufacturing Engineers and published by . This book was released on 2003 with total page 684 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis PREVISION D'ENDOMMAGEMENT SOUS CHARGEMENTS QUASI STATIQUES ET CYCLIQUES DES STRUCTURES COMPOSITES STRATIFIEES by : Alain Thionnet (chercheur en mécanique des matériaux).)
Download or read book PREVISION D'ENDOMMAGEMENT SOUS CHARGEMENTS QUASI STATIQUES ET CYCLIQUES DES STRUCTURES COMPOSITES STRATIFIEES written by Alain Thionnet (chercheur en mécanique des matériaux).) and published by . This book was released on 1991 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: CETTE ETUDE S'INTERESSE AUX MECANISMES D'ENDOMMAGEMENT PAR FISSURATION DES PLIS ET PAR DELAMINAGE DE BORDS LIBRES DANS LES STRUCTURES COMPOSITES STRATIFIEES DE TYPE PLAQUE PLANE. LA FISSURATION DES PLIS, DECRITE PAR UNE UNIQUE VARIABLE DEFINIE A PARTIR DE GRANDEURS PHYSIQUES DU DEFAUT, EST TRAITEE A L'AIDE DE DEUX APPROCHES. LA PREMIERE, QUALIFIEE DE MESO-MACRO EST ECRITE SUR LE PLI EQUIVALENT AU PLI FISSURE AU SENS DE LA MECANIQUE DE L'ENDOMMAGEMENT. LA SECONDE, QUALIFIEE DE MICRO-MACRO, EST FONDEE SUR L'ASPECT STATISTIQUE DU PHENOMENE. DANS LES DEUX CAS, SOIT SOUS UN CHARGEMENT QUASI STATIQUE, SOIT SOUS UN CHARGEMENT DE FATIGUE, ON SIMULE LA MULTIPLICATION DES FISSURES DANS CHAQUE PLI DE LA STRUCTURE. POUR LE DELAMINAGE, ON EVALUE TOUT D'ABORD LES CONSEQUENCES DE CETTE DEGRADATION SUR LE COMPORTEMENT GENERALISE DE LA STRUCTURE. ENSUITE, UN MODELE EST ECRIT ABOUTISSANT A UNE LOI D'EVOLUTION DU DELAMINAGE. LE CARACTERE ANALYTIQUE DE LA MODELISATION PERMET DE COUPLER CETTE DEGRADATION GLOBALE A CELLE LOCALE DUE A LA FISSURATION DANS CHAQUE PLI DE LA STRUCTURE ET DE VOIR, DANS LE CAS D'UNE PLAQUE PLANE LISSE, LES DEUX ENDOMMAGEMENTS EVOLUER ET INTERAGIR DE MANIERE CONTINUE. POUR ETUDIER DES STRUCTURES PLUS COMPLEXES, LES MODELES SONT IMPLEMENTES DANS UN CODE DE CALCUL PAR ELEMENTS FINIS MOYENNANT UNE HYPOTHESE D'EVOLUTION DE TYPE TOUT-OU-RIEN POUR LE DELAMINAGE. DES CALCULS REALISES SUR DES PLAQUES TROUEES MONTRENT UNE BONNE TENDANCE A LA PREVISION DES ZONES ENDOMMAGEES
Book Synopsis Dictionary of Building and Civil Engineering by : Don Montague
Download or read book Dictionary of Building and Civil Engineering written by Don Montague and published by Taylor & Francis. This book was released on 1996 with total page 472 pages. Available in PDF, EPUB and Kindle. Book excerpt: This dual-language dictionary lists over 20,000 specialist terms in both French and English, covering architecture, building, engineering and property terms. It meets the needs of all building professionals working on projects overseas. It has been comprehensively researched and compiled to provide an invaluable reference source in an increasingly European marketplace.
Book Synopsis Polymer Viscoelasticity by : Evaristo Riande
Download or read book Polymer Viscoelasticity written by Evaristo Riande and published by CRC Press. This book was released on 1999-11-05 with total page 906 pages. Available in PDF, EPUB and Kindle. Book excerpt: Showcasing vital engineering applications to transient and dynamic pertubations of macromolecular materials, structural recovery's role in mechanical responses in the glassy state, and viscoelastic parameters that condition the non-Newtonian behaviour of polymers, this work presents a systematic account of the responses of macromolecular materials to mechanical force fields. It focuses on the most important features of the linear stress-strain relationships for ideal solids and liquids.
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.
Book Synopsis Polymer Microscopy by : Linda Sawyer
Download or read book Polymer Microscopy written by Linda Sawyer and published by Springer Science & Business Media. This book was released on 2008-12-24 with total page 568 pages. Available in PDF, EPUB and Kindle. Book excerpt: This extensively updated and revised Third Edition is a comprehensive and practical guide to the study of the microstructure of polymers. It is the result of the authors' many years of academic and industrial experience. Introductory chapters deal with the basic concepts of both polymer morphology and processing and microscopy and imaging theory. The core of the book is more applied, with many examples of specimen preparation and image interpretation leading to materials characterization. Emerging techniques such as compositional mapping in which microscopy is combined with spectroscopy are considered. The book closes with a problem solving guide.
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 Environmental Effects on Composite Materials, Volume I by : George S. Springer
Download or read book Environmental Effects on Composite Materials, Volume I written by George S. Springer and published by CRC Press. This book was released on 1981 with total page 222 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Composite Materials by : Isaac M. Daniel
Download or read book Composite Materials written by Isaac M. Daniel and published by ASTM International. This book was released on 1982 with total page 608 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Behavior of Deep Foundations by : Raymond Lundgren
Download or read book Behavior of Deep Foundations written by Raymond Lundgren and published by ASTM International. This book was released on 1979 with total page 621 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Mechanical Vibration by : William John Palm
Download or read book Mechanical Vibration written by William John Palm and published by . This book was released on 2007 with total page 728 pages. Available in PDF, EPUB and Kindle. Book excerpt: Model, analyze, and solve vibration problems, using modern computer tools. Featuring clear explanations, worked examples, applications, and modern computer tools, William Palm's Mechanical Vibration provides a firm foundation in vibratory systems. You'll learn how to apply knowledge of mathematics and science to model and analyze systems ranging from a single degree of freedom to complex systems with two and more degrees of freedom. Separate MATLAB sections at the end of most chapters show how to use the most recent features of this standard engineering tool, in the context of solving vibration problems. The text introduces Simulink where solutions may be difficult to program in MATLAB, such as modeling Coulomb friction effects and simulating systems that contain non-linearities. Ample problems throughout the text provide opportunities to practice identifying, formulating, and solving vibration problems. KEY FEATURES Strong pedagogical approach, including chapter objectives and summaries Extensive worked examples illustrating applications Numerous realistic homework problems Up-to-date MATLAB coverage The first vibration textbook to cover Simulink Self-contained introduction to MATLAB in Appendix A Special section dealing with active vibration control in sports equipment Special sections devoted to obtaining parameter values from experimental data
Book Synopsis Advanced Micro- & Mesoporous Materials by : K. Hadjiivanov
Download or read book Advanced Micro- & Mesoporous Materials written by K. Hadjiivanov and published by Heron Press. This book was released on 2008-10-31 with total page 391 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Modelling and Simulation in Thermal and Chemical Engineering by : J. Thoma
Download or read book Modelling and Simulation in Thermal and Chemical Engineering written by J. Thoma and published by Springer Science & Business Media. This book was released on 2000 with total page 248 pages. Available in PDF, EPUB and Kindle. Book excerpt: The main object of this book is modeling and simulation of energetic processes by bond graphs. But even without knowledge of this powerful method it can be used to a certain extent as an introduction to simulation in thermodynamics. The book addresses advanced students, lecturers and researchers in mechanical engineering and automation as well as experienced engineers in process industries.
Book Synopsis Progress in Clean Energy, Volume 2 by : Ibrahim Dincer
Download or read book Progress in Clean Energy, Volume 2 written by Ibrahim Dincer and published by Springer. This book was released on 2015-11-12 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: This expansive reference provides readers with the broadest available single-volume coverage of leading-edge advances in the development and optimization of clean energy technologies. From innovative biofuel feed stocks and processing techniques, to novel solar materials with record-breaking efficiencies, remote-sensing for offshore wind turbines to breakthroughs in high performance PEM fuel cell electrode manufacturing, phase change materials in green buildings to bio sorption of pharmaceutical pollutants, the myriad exciting developments in green technology described in this book will provide inspiration and information to researchers, engineers and students working in sustainability around the world.
Book Synopsis Construction Dictionary by : Nawic Education Foundation
Download or read book Construction Dictionary written by Nawic Education Foundation and published by . This book was released on 2014 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: An extensive listing of the terms and phrases used in construction. Included are many that are encountered daily on the jobsite or in the construction office.
