ETUDE ET SIMULATION DE TEXTURES DE DEFORMATION A CHAUD D'ALLIAGES D'ALUMINIUM PDF Download
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Author: FRANCK.. PEROCHEAU
Publisher:
ISBN:
Category :
Languages : fr
Pages : 230
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Book Description
CETTE ETUDE CONCERNE LES TEXTURES DE DEFORMATION A CHAUD D'ALLIAGES D'ALUMINIUM, LEUR SIMULATION ET LES MECANISMES DE DEFORMATION. A FROID, L'ALUMINIUM SE DEFORME PAR GLISSEMENT SUR DES SYSTEMES 111110. A CHAUD, CES SYSTEMES PRESENTENT UN COMPORTEMENT VISCOPLASTIQUE ET D'AUTRES S'ACTIVENT. AFIN DE PRECISER CE PHENOMENE, DES MONOCRISTAUX D'AL-1%MN ONT ETE COMPRIMES EN CHANNEL-DIE. LES ORIENTATIONS CHOISIES SOLLICITENT PREFERENTIELLEMENT LES SYSTEMES 110, 001 ET 111110. LES COURBES CONTRAINTE-DEFORMATION INDIQUENT QU'UNE LOI PUISSANCE PERMET D'APPROCHER LEUR RHEOLOGIE. AINSI, LE COMPORTEMENT DE CES DIFFERENTS SYSTEMES EST QUANTIFIE ENTRE 400 ET 500\C A DES VITESSES COMPRISES ENTRE 10 - 3 ET 10S - 1. CES SYSTEMES SONT ACTIFS DANS CES CONDITIONS ET LES PARAMETRES DE LEUR LOI D'ECOULEMENT DEPENDENT PRINCIPALEMENT DE LA TEMPERATURE. DES TEXTURES EXPERIMENTALES SONT ANALYSEES QUANTITATIVEMENT PAR L'INTERMEDIAIRE DE LEUR FDOC ET DES FRACTIONS VOLUMIQUES DE LEURS COMPOSANTES. EN COMPRESSION PLANE ET TORSION, POUR UNE DEFORMATION DONNEE, LA TEMPERATURE EST LE FACTEUR PRINCIPAL DE LEURS EVOLUTIONS. GRACE A DES TEXTURES DE LAMINAGE ET D'EXTRUSION, UNE DESCRIPTION UNIFIEE DES TEXTURES DE DEFORMATION PLANE EST PROPOSEE. LES SIMULATIONS UTILISENT LES SYSTEMES 111, 001, 110 ET 112110 ASSOCIES A LA LOI PUISSANCE. L'HYPOTHESE DE LOCALISATION EST DE TYPE TAYLOR A DEFORMATIONS RELACHEES. UNE PREMIERE PARTIE EST CONSACREE AUX MODES DE DEFORMATION SIMPLES. LE CHANGEMENT DES PARAMETRES RHEOLOGIQUES DES SYSTEMES INFLUENCE NETTEMENT LES RESULTATS EN COMPRESSION PLANE MAIS PEU EN TORSION. UNE SECONDE PARTIE ETEND CES SIMULATIONS A DES CHEMINS DE DEFORMATION PLANE COMPLEXES AFIN DE PREDIRE DES TEXTURES DE LAMINAGE ET D'EXTRUSION. DANS CES CAS, LES CHEMINS DE DEFORMATION ONT ETE CALCULES PAR ELEMENTS FINIS EN CONSIDERANT UN MATERIAU ISOTROPE. LES TEXTURES AINSI CALCULEES PREDISENT TRES CONVENABLEMENT LES TEXTURES EXPERIMENTALES.
Author: FRANCK.. PEROCHEAU
Publisher:
ISBN:
Category :
Languages : fr
Pages : 230
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Book Description
CETTE ETUDE CONCERNE LES TEXTURES DE DEFORMATION A CHAUD D'ALLIAGES D'ALUMINIUM, LEUR SIMULATION ET LES MECANISMES DE DEFORMATION. A FROID, L'ALUMINIUM SE DEFORME PAR GLISSEMENT SUR DES SYSTEMES 111110. A CHAUD, CES SYSTEMES PRESENTENT UN COMPORTEMENT VISCOPLASTIQUE ET D'AUTRES S'ACTIVENT. AFIN DE PRECISER CE PHENOMENE, DES MONOCRISTAUX D'AL-1%MN ONT ETE COMPRIMES EN CHANNEL-DIE. LES ORIENTATIONS CHOISIES SOLLICITENT PREFERENTIELLEMENT LES SYSTEMES 110, 001 ET 111110. LES COURBES CONTRAINTE-DEFORMATION INDIQUENT QU'UNE LOI PUISSANCE PERMET D'APPROCHER LEUR RHEOLOGIE. AINSI, LE COMPORTEMENT DE CES DIFFERENTS SYSTEMES EST QUANTIFIE ENTRE 400 ET 500\C A DES VITESSES COMPRISES ENTRE 10 - 3 ET 10S - 1. CES SYSTEMES SONT ACTIFS DANS CES CONDITIONS ET LES PARAMETRES DE LEUR LOI D'ECOULEMENT DEPENDENT PRINCIPALEMENT DE LA TEMPERATURE. DES TEXTURES EXPERIMENTALES SONT ANALYSEES QUANTITATIVEMENT PAR L'INTERMEDIAIRE DE LEUR FDOC ET DES FRACTIONS VOLUMIQUES DE LEURS COMPOSANTES. EN COMPRESSION PLANE ET TORSION, POUR UNE DEFORMATION DONNEE, LA TEMPERATURE EST LE FACTEUR PRINCIPAL DE LEURS EVOLUTIONS. GRACE A DES TEXTURES DE LAMINAGE ET D'EXTRUSION, UNE DESCRIPTION UNIFIEE DES TEXTURES DE DEFORMATION PLANE EST PROPOSEE. LES SIMULATIONS UTILISENT LES SYSTEMES 111, 001, 110 ET 112110 ASSOCIES A LA LOI PUISSANCE. L'HYPOTHESE DE LOCALISATION EST DE TYPE TAYLOR A DEFORMATIONS RELACHEES. UNE PREMIERE PARTIE EST CONSACREE AUX MODES DE DEFORMATION SIMPLES. LE CHANGEMENT DES PARAMETRES RHEOLOGIQUES DES SYSTEMES INFLUENCE NETTEMENT LES RESULTATS EN COMPRESSION PLANE MAIS PEU EN TORSION. UNE SECONDE PARTIE ETEND CES SIMULATIONS A DES CHEMINS DE DEFORMATION PLANE COMPLEXES AFIN DE PREDIRE DES TEXTURES DE LAMINAGE ET D'EXTRUSION. DANS CES CAS, LES CHEMINS DE DEFORMATION ONT ETE CALCULES PAR ELEMENTS FINIS EN CONSIDERANT UN MATERIAU ISOTROPE. LES TEXTURES AINSI CALCULEES PREDISENT TRES CONVENABLEMENT LES TEXTURES EXPERIMENTALES.
Author: Claire Maurice
Publisher:
ISBN:
Category :
Languages : fr
Pages : 199
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Book Description
L'ANISOTROPIE FINALE DES TOLES D'ALLIAGE D'ALUMINIUM EST TRES SENSIBLE AUX TEXTURES CRISTALLOGRAPHIQUES DEVELOPPEES AU COURS DU LAMINAGE A CHAUD, ET NOTAMMENT A LA COMPOSANTE CUBE 100001. NOUS ETUDIONS ICI L'INFLUENCE DES PARAMETRES VITESSE ET TEMPERATURE DE DEFORMATION SUR L'EVOLUTION DE LA TEXTURE DE LAMINAGE A CHAUD D'UN ALLIAGE 3004 (AL+1%MN+1%MG). LES ETATS DE CONTRAINTE ET DE DEFORMATION DU LAMINAGE SONT SIMULES AU MOYEN D'UN DISPOSITIF ORIGINAL DE COMPRESSION PLANE A CHAUD. L'AUGMENTATION DE LA TEMPERATURE ET/OU LA DIMINUTION DE LA VITESSE DE DEFORMATION PROVOQUENT UN ACCROISSEMENT SYSTEMATIQUE DE L'INTENSITE DE LA COMPOSANTE LAITON 110112 AU DETRIMENT DES COMPOSANTES CUIVRE 112111 ET S 123634, CARACTERISTIQUES DES TEXTURES DE LAMINAGE A FROID. EN OUTRE, LA COMPOSANTE CUBE 100001, CARACTERISTIQUE DE LA RECRISTALLISATION DES METAUX CFC, APPARAIT ICI COMME COMPOSANTE MINEURE DES TEXTURES DE DEFORMATION A CHAUD. L'ETUDE DE L'INFLUENCE DE LA TEMPERATURE ET DE LA VITESSE SUR LES MECANISMES DE DEFORMATION DE MONOCRISTAUX REVELE UNE STABILISATION DE L'ORIENTATION CUBE A PLUS HAUTE TEMPERATURE ET PLUS FAIBLE VITESSE. CETTE STABILISATION PEUT ETRE EXPLIQUEE PAR L'ACTIVATION DU GLISSEMENT SUR DES PLANS NON-OCTAEDRIQUES 110. L'INFLUENCE DES SYSTEMES DE GLISSEMENT NON-OCTAEDRIQUES 110110, 112110 ET 001110 SUR L'EVOLUTION DES TEXTURES DE DEFORMATION DE POLYCRISTAUX EST ALORS ETUDIEE PAR SIMULATION NUMERIQUE. L'EMPLOI D'UNE LOI D'ECOULEMENT MICROSCOPIQUE VISCOPLASTIQUE, COUPLEE A DES MODELES D'ACCOMMODATION DES CONTRAINTES DU TYPE TAYLOR RELACHE OU AUTO-COHERENT CONDUISENT A DES TEXTURES SIMULEES PRESENTANT LES MEMES CARACTERISTIQUES QUE NOS TEXTURES EXPERIMENTALES
Author:
Publisher:
ISBN:
Category : Metallurgy
Languages : en
Pages : 950
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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: Regis Blondeau
Publisher: John Wiley & Sons
ISBN: 1118623746
Category : Technology & Engineering
Languages : en
Pages : 384
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Book Description
This book offers a comprehensive overview on the subject of welding. Written by a group of expert contributors, the book covers all welding methods, from traditional to high-energy plasmas and lasers. The reference presents joint welding, stainless steel welding, aluminum welding, welding in the nuclear industry, and all aspects of welding quality control.
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: Claude Bathias
Publisher: John Wiley & Sons
ISBN: 1118623371
Category : Technology & Engineering
Languages : en
Pages : 415
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Book Description
The design of mechanical structures with improved and predictable durability cannot be achieved without a thorough understanding of the mechanisms of fatigue damage and more specifically the relationships between the microstructure of materials and their fatigue properties. Written by leading experts in the field, this book (which is complementary to Fatigue of Materials and Structures: Application to Damage and Design, also edited by Claude Bathias and André Pineau), provides an authoritative, comprehensive and unified treatment of the mechanics and micromechanisms of fatigue in metals, polymers and composites. Each chapter is devoted to one of the major classes of materials or to different types of fatigue damage, thereby providing overall coverage of the field. The book deals with crack initiation, crack growth, low-cycle fatigue, gigacycle fatigue, shorts cracks, fatigue micromechanisms and the local approach to fatigue damage, corrosion fatigue, environmental effects and variable amplitude loadings, and will be an important and much used reference for students, practicing engineers and researchers studying fracture and fatigue in numerous areas of mechanical, structural, civil, design, nuclear, and aerospace engineering as well as materials science.
Author: Georges Cailletaud
Publisher: John Wiley & Sons
ISBN: 1848215800
Category : Technology & Engineering
Languages : en
Pages : 293
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Book Description
This book focuses on a particular class of models (namely Multi-Mechanism models) and their applications to extensive experimental data base related to different kind of materials. These models (i) are able to describe the main mechanical effects in plasticity, creep, creep/plasticity interaction, ratcheting extra-hardening under non-proportional loading (ii) provide local information (such us local stress/strain fields, damage, ….). A particular attention is paid to the identification process of material parameters. Moreover, finite element implementation of the Multi-Mechanism models is detailed.
Author: Jacques Besson
Publisher: Springer Science & Business Media
ISBN: 9048133564
Category : Science
Languages : en
Pages : 433
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Book Description
In mechanical engineering and structural analysis there is a significant gap between the material models currently used by engineers for industry applications and those already available in research laboratories. This is especially apparent with the huge progress of computational possibilities and the corresponding dissemination of numerical tools in engineering practice, which essentially deliver linear solutions. Future improvements of design and life assessment methods necessarily involve non-linear solutions for inelastic responses, in plasticity or viscoplasticity, as well as damage and fracture analyses. The dissemination of knowledge can be improved by software developments, data base completion and generalization, but also by information and training. With such a perspective Non-Linear Mechanics of Materials proposes a knowledge actualization, in order to better understand and use recent material constitutive and damage modeling methods in the context of structural analysis or multiscale material microstructure computations.
Author: Georg J. Schmitz
Publisher: John Wiley & Sons
ISBN: 3527339027
Category : Technology & Engineering
Languages : en
Pages : 628
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Book Description
As one of the results of an ambitious project, this handbook provides a well-structured directory of globally available software tools in the area of Integrated Computational Materials Engineering (ICME). The compilation covers models, software tools, and numerical methods allowing describing electronic, atomistic, and mesoscopic phenomena, which in their combination determine the microstructure and the properties of materials. It reaches out to simulations of component manufacture comprising primary shaping, forming, joining, coating, heat treatment, and machining processes. Models and tools addressing the in-service behavior like fatigue, corrosion, and eventually recycling complete the compilation. An introductory overview is provided for each of these different modelling areas highlighting the relevant phenomena and also discussing the current state for the different simulation approaches. A must-have for researchers, application engineers, and simulation software providers seeking a holistic overview about the current state of the art in a huge variety of modelling topics. This handbook equally serves as a reference manual for academic and commercial software developers and providers, for industrial users of simulation software, and for decision makers seeking to optimize their production by simulations. In view of its sound introductions into the different fields of materials physics, materials chemistry, materials engineering and materials processing it also serves as a tutorial for students in the emerging discipline of ICME, which requires a broad view on things and at least a basic education in adjacent fields.
