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Author: Thierry Cutard
Publisher:
ISBN:
Category :
Languages : fr
Pages : 164
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Book Description
DANS LES COMPOSITES A MATRICE CERAMIQUE ET A FIBRES NICALON SIC, L'EXISTENCE D'UNE INTERPHASE DE CARBONE ENTRE LA FIBRE ET LA MATRICE JOUE UN ROLE PRIMORDIAL SUR LE CARACTERE NON FRAGILE DE CES MATERIAUX. EN L'ABSENCE DE REVETEMENT DE PROTECTION ANTI-OXYDATION, CES COMPOSITES SONT TRES SENSIBLES A LA PRESENCE D'OXYGENE A HAUTE TEMPERATURE, PUISQU'ELLE PROVOQUE UNE COMBUSTION DE L'INTERPHASE CARBONE, SUIVIE DE SON REMPLACEMENT PAR DE LA SILICE. CES MECANISMES D'OXYDATION SONT SUSCEPTIBLES D'EVOLUER LORSQUE LE MATERIAU EST SOUMIS A DES SOLLICITATIONS MECANIQUES EXTERIEURES, A HAUTE TEMPERATURE. FONDEE SUR L'UTILISATION DE METHODES DE CARACTERISATION NON DESTRUCTIVES, CETTE ETUDE PORTE SUR LE COMPORTEMENT DE COMPOSITES SIC/C/SIC BIDIRECTIONNELS, ELABORES PAR LA SOCIETE EUROPEENNE DE PROPULSION, ET DE COMPOSITES SIC/MAS-L UNI- ET BIDIRECTIONNELS, ELABORES PAR L'AEROSPATIALE, EN FONCTION DE DIVERS PARAMETRES D'ENVIRONNEMENT: TEMPERATURE, ATMOSPHERE, PRESSION GAZEUSE, CONTRAINTE DE TRACTION. L'ETUDE DU COMPORTEMENT DES COMPOSITES SIC/MAS-L LORS DE CYCLES THERMIQUES ET LORS DE VIEILLISSEMENTS ISOTHERMES SANS SOLLICITATION MECANIQUE EXTERIEURE A REVELE LES MODIFICATIONS MICROSTRUCTURALES QUI ONT LIEU DANS LA MATRICE ET AU NIVEAU DES INTERFACES FIBRE-MATRICE A HAUTE TEMPERATURE. DES PHENOMENES DE CRISTALLISATION ET DE CHANGEMENTS DE PHASE ONT ETE MIS EN EVIDENCE DANS LA MATRICE MAS-L LORS DE VIEILLISSEMENT ISOTHERMES SOUS VIDE ET SOUS AIR. SOUS AIR, DES MECANISMES D'OXYDATION DES INTERPHASES CARBONE SIMILAIRES A CEUX DES COMPOSITES SIC/C/SIC ONT ETE OBSERVES. UN ENSEMBLE DE SUIVI DU MODULE D'YOUNG A HAUTE TEMPERATURE ET SOUS CONTRAINTE DE TRACTION DE COMPOSITES CERAMIQUE-CERAMIQUE A ETE DEVELOPPE AU MOYEN D'UNE PROPAGATION ULTRASONORE EN MODE BARRE LONGUE. CET ENSEMBLE PERMET D'EVALUER LA PROGRESSION DE L'ENDOMMAGEMENT DANS DES EPROUVETTES SOUMISES A DES CONTRAINTES DE TRACTION, SOIT A TEMPERATURE AMBIANTE, SOIT LORS DE VIEILLISSEMENTS ISOTHERMES. CONCERNANT LES SIC/C/SIC, L'ANALYSE DU COMPORTEMENT SOUS TRACTION A TEMPERATURE AMBIANTE ET A HAUTE TEMPERATURE A ETE ABORDEE. A HAUTE TEMPERATURE, L'INFLUENCE D'UNE CONTRAINTE DE TRACTION SUR LES CINETIQUES D'OXYDATION DES INTERFACES FIBRE-MATRICE A ETE MISE EN EVIDENCE
Author: Thierry Cutard
Publisher:
ISBN:
Category :
Languages : fr
Pages : 164
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Book Description
DANS LES COMPOSITES A MATRICE CERAMIQUE ET A FIBRES NICALON SIC, L'EXISTENCE D'UNE INTERPHASE DE CARBONE ENTRE LA FIBRE ET LA MATRICE JOUE UN ROLE PRIMORDIAL SUR LE CARACTERE NON FRAGILE DE CES MATERIAUX. EN L'ABSENCE DE REVETEMENT DE PROTECTION ANTI-OXYDATION, CES COMPOSITES SONT TRES SENSIBLES A LA PRESENCE D'OXYGENE A HAUTE TEMPERATURE, PUISQU'ELLE PROVOQUE UNE COMBUSTION DE L'INTERPHASE CARBONE, SUIVIE DE SON REMPLACEMENT PAR DE LA SILICE. CES MECANISMES D'OXYDATION SONT SUSCEPTIBLES D'EVOLUER LORSQUE LE MATERIAU EST SOUMIS A DES SOLLICITATIONS MECANIQUES EXTERIEURES, A HAUTE TEMPERATURE. FONDEE SUR L'UTILISATION DE METHODES DE CARACTERISATION NON DESTRUCTIVES, CETTE ETUDE PORTE SUR LE COMPORTEMENT DE COMPOSITES SIC/C/SIC BIDIRECTIONNELS, ELABORES PAR LA SOCIETE EUROPEENNE DE PROPULSION, ET DE COMPOSITES SIC/MAS-L UNI- ET BIDIRECTIONNELS, ELABORES PAR L'AEROSPATIALE, EN FONCTION DE DIVERS PARAMETRES D'ENVIRONNEMENT: TEMPERATURE, ATMOSPHERE, PRESSION GAZEUSE, CONTRAINTE DE TRACTION. L'ETUDE DU COMPORTEMENT DES COMPOSITES SIC/MAS-L LORS DE CYCLES THERMIQUES ET LORS DE VIEILLISSEMENTS ISOTHERMES SANS SOLLICITATION MECANIQUE EXTERIEURE A REVELE LES MODIFICATIONS MICROSTRUCTURALES QUI ONT LIEU DANS LA MATRICE ET AU NIVEAU DES INTERFACES FIBRE-MATRICE A HAUTE TEMPERATURE. DES PHENOMENES DE CRISTALLISATION ET DE CHANGEMENTS DE PHASE ONT ETE MIS EN EVIDENCE DANS LA MATRICE MAS-L LORS DE VIEILLISSEMENT ISOTHERMES SOUS VIDE ET SOUS AIR. SOUS AIR, DES MECANISMES D'OXYDATION DES INTERPHASES CARBONE SIMILAIRES A CEUX DES COMPOSITES SIC/C/SIC ONT ETE OBSERVES. UN ENSEMBLE DE SUIVI DU MODULE D'YOUNG A HAUTE TEMPERATURE ET SOUS CONTRAINTE DE TRACTION DE COMPOSITES CERAMIQUE-CERAMIQUE A ETE DEVELOPPE AU MOYEN D'UNE PROPAGATION ULTRASONORE EN MODE BARRE LONGUE. CET ENSEMBLE PERMET D'EVALUER LA PROGRESSION DE L'ENDOMMAGEMENT DANS DES EPROUVETTES SOUMISES A DES CONTRAINTES DE TRACTION, SOIT A TEMPERATURE AMBIANTE, SOIT LORS DE VIEILLISSEMENTS ISOTHERMES. CONCERNANT LES SIC/C/SIC, L'ANALYSE DU COMPORTEMENT SOUS TRACTION A TEMPERATURE AMBIANTE ET A HAUTE TEMPERATURE A ETE ABORDEE. A HAUTE TEMPERATURE, L'INFLUENCE D'UNE CONTRAINTE DE TRACTION SUR LES CINETIQUES D'OXYDATION DES INTERFACES FIBRE-MATRICE A ETE MISE EN EVIDENCE
Author: J. Belle
Publisher:
ISBN:
Category : Nuclear fuels
Languages : en
Pages : 146
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Author: Agnes Buka
Publisher: World Scientific
ISBN: 1848167997
Category : Science
Languages : en
Pages : 299
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Book Description
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: International Atomic Energy Agency
Publisher: International Atomic Energy Agency
ISBN: 9789201063205
Category : Technology & Engineering
Languages : en
Pages : 72
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Book Description
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.
Author: Ellis L. Krinitzsky
Publisher:
ISBN:
Category : Gravel
Languages : en
Pages : 178
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Book Description
Author: Igor Bezverkhyy
Publisher: Trans Tech Publications Ltd
ISBN: 3038137030
Category : Technology & Engineering
Languages : en
Pages : 600
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Book Description
The International Conference on Diffusion in Materials (DIMAT) is the benchmark conference series for diffusion in solids. DIMAT 2011 was organized by the University of Bourgogne in association with CNRS, Dijon (France). The conference showcased new results concerning theoretical tools as well as applied research approaches. Diffusion processes affect all types of materials: nanomaterials, materials for energy, metallurgy, glasses and ceramics, but each requires its own numerical tools. Volume is indexed by Thomson Reuters CPCI-S (WoS). This volume comprises most of the contributions presented at DIMAT 2011: 4 plenary lectures delivered by famous high-level scientists plus 88 contributions in the form of keynote lectures, talks and posters.
Author: P. Kartaschoff
Publisher:
ISBN:
Category : Frequencies of oscillating systems
Languages : en
Pages : 284
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Author: William John Palm
Publisher:
ISBN:
Category : Science
Languages : en
Pages : 728
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Book Description
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
Author: Jerome V. Moloney
Publisher: Springer Science & Business Media
ISBN: 9780387985817
Category : Business & Economics
Languages : en
Pages : 270
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Book Description
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.
Author: Canada. Patent Office
Publisher:
ISBN:
Category : Copyright
Languages : en
Pages : 1070
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Book Description
