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Author: Pascal Matthieu
Publisher:
ISBN:
Category :
Languages : fr
Pages : 214
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Book Description
Lors des simulations numériques par éléments finis des grands déplacements, rotations et grandes déformations, observés dans la majorité des problèmes mécaniques non linéaires et notamment en forgeage, la géométrie de certains éléments se dégrade au point de mettre en péril la performance du modèle. Une technique de reconstruction du maillage, ou remaillage est nécessaire pour de tels problèmes. Dans le schéma présenté du programme de calcul par la méthode des éléments finis ASTRID, un test de précision des calculs est introduit avant chaque nouvel incrément. Si un remaillage est justifié, le nouveau maillage est construit, par un nouveau mailleur de couches, à partir de la géométrie du contour de l'ancien. Les champs des variables d'état sont alors transférés et les conditions aux limites imposées, la simulation peut ainsi continuer. L'algorithme mis au point par l'auteur est applique à un modèle éléments finis de la mise en forme d'une pièce creuse ogivée, comprenant trois séquences: une extrusion à 1150 degrés Celsius avec une réduction de hauteur initiale du lopin de 94%, un étirage à 1150 degrés Celsius et un ogivage à température ambiante. Le modèle inclut une loi de croissance de cavités selon un potentiel endommagé. A chaque séquence les cartes des variables d'état sont présentées et en particulier, la fraction volumique de cavités sur la pièce ogivée. En conclusion, l'auteur montre l'apport essentiel et les performances des modèles éléments finis avec reconstruction du maillage.
Author: Pascal Matthieu
Publisher:
ISBN:
Category :
Languages : fr
Pages : 214
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Book Description
Lors des simulations numériques par éléments finis des grands déplacements, rotations et grandes déformations, observés dans la majorité des problèmes mécaniques non linéaires et notamment en forgeage, la géométrie de certains éléments se dégrade au point de mettre en péril la performance du modèle. Une technique de reconstruction du maillage, ou remaillage est nécessaire pour de tels problèmes. Dans le schéma présenté du programme de calcul par la méthode des éléments finis ASTRID, un test de précision des calculs est introduit avant chaque nouvel incrément. Si un remaillage est justifié, le nouveau maillage est construit, par un nouveau mailleur de couches, à partir de la géométrie du contour de l'ancien. Les champs des variables d'état sont alors transférés et les conditions aux limites imposées, la simulation peut ainsi continuer. L'algorithme mis au point par l'auteur est applique à un modèle éléments finis de la mise en forme d'une pièce creuse ogivée, comprenant trois séquences: une extrusion à 1150 degrés Celsius avec une réduction de hauteur initiale du lopin de 94%, un étirage à 1150 degrés Celsius et un ogivage à température ambiante. Le modèle inclut une loi de croissance de cavités selon un potentiel endommagé. A chaque séquence les cartes des variables d'état sont présentées et en particulier, la fraction volumique de cavités sur la pièce ogivée. En conclusion, l'auteur montre l'apport essentiel et les performances des modèles éléments finis avec reconstruction du maillage.
Author: THIERRY.. COUPEZ
Publisher:
ISBN:
Category :
Languages : fr
Pages : 242
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Book Description
DES CONDITIONS D'INCOMPRESSIBILITE INCREMENTALE NON LINEAIRE ET LINEARISEE SONT PROPOSEES DANS LE CHAPITRE 1. ELLES PERMETTENT D'ASSURER LA CONSERVATION DU VOLUME DANS LES FORMULATIONS INCREMENTALES DITES LAGRANGIENNES REACTUALISEES. LE CHAPITRE 2 EST CONSACRE A LA PRISE EN COMPTE DE L'INCOMPRESSIBILITE DANS LES METHODES ELEMENTS FINIS APPLIQUEES A LA VISCOPLASTICITE. UN MAILLEUR AUTOMATIQUE BI-DIMENSIONNEL, BASEE SUR L'ALGORITHME DE LA TRIANGULATION DE DELAUNAY EST PRESENTE DANS LE CHAPITRE 3. ON DECRIT L'ALGORITHME D'UN GENERATEUR DE CONTOUR. ON APPLIQUE CES OUTILS AU REMAILLAGE AUTOMATIQUE DANS LA SIMULATION NUMERIQUE BI-DIMENSIONNEL ET AXISYMETRIQUE DU FORGEAGE. UNE NOUVELLE METHODE DE GENERATION DE MAILLAGE EST PROPOSEE DANS LE CHAPITRE 4. ELLE EST BASEE SUR L'AMELIORATION DE TOPOLOGIE DE MAILLAGE GENERALISEE ET UN PRINCIPE DE VOLUME MINIMAL. UN MAILLEUR DE SURFACE GAUCHE PERMETTANT DE TRAITER LA SURFACE DES MAILLAGES EST PROPOSE, QUI ASSURE LA PRESERVATION DE LA GEOMETRIE A L'AIDE D'UNE MESURE ANGULAIRE DE LA COURBURE CONCENTREE AU NUDS DE LA TRIANGULATION. L'APPLICATION DE CES OUTILS AU REMAILLAGE AUTOMATIQUE 3D EST PRESENTEE ET ILLUSTREE PAR LES EXEMPLES DE CAS INDUSTRIELS DU CHAPITRE 5
Author: Grigore Gogu
Publisher: Springer Science & Business Media
ISBN: 940170161X
Category : Technology & Engineering
Languages : en
Pages : 541
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Book Description
This book presents recent advances in the integration and the optimization of product design and manufacturing systems. The book is divided into 3 chapters corresponding to the following three main topics : - optimization of product design process (mechanical design process, mass customization, modeling the product representation, computer support for engineering design, support systems for tolerancing, simulation and optimization tools for structures and for mechanisms and robots), -optimization of manufacturing systems (multi-criteria optimization and fuzzy volumes, tooth path generation, machine-tools behavior, surface integrity and precision, process simulation), - methodological aspects of integrated design and manufacturing (solid modeling, collaborative tools and knowledge formalization, integrating product and process design and innovation, robust and reliable design, multi-agent approach in VR environment). The present book is of interest to engineers, researchers, academic staff, and postgraduate students interested in integrated design and manufacturing in mechanical engineering.
Author: Shakeel Ahmed
Publisher: Springer Science & Business Media
ISBN: 140206540X
Category : Science
Languages : en
Pages : 265
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Book Description
This book contains the results and findings of the advanced research carried out in a pilot area with a thorough investigation of the structure and functioning of an aquifer in a granitic formation. It characterizes the hard rock aquifer system and examines its properties and behavior as well as systematically details the geophysical, geological and remote sensing applications to conceptualize such an aquifer system.
Author: Max Giordano
Publisher: John Wiley & Sons
ISBN: 1118587529
Category : Business & Economics
Languages : en
Pages : 389
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Book Description
This book gives a comprehensive view of the most recent major international research in the field of tolerancing, and is an excellent resource for anyone interested in Computer Aided Tolerating. It is organized into 4 parts. Part 1 focuses on the more general problems of tolerance analysis and synthesis, for tolerancing in mechanical design and manufacturing processes. Part 2 specifically highlights the simulation of assembly with defects, and the influence of tolerances on the quality of the assembly. Part 3 deals with measurement aspects, and quality control throughout the life cycle. Different measurement technologies and methods for estimating uncertainty are considered. In Part 4, different aspects of tolerancing and their interactions are explored, from the definition of functional requirement to measurement processes in a PLM approach.
Author: A Chrysanthou
Publisher: Woodhead Publishing
ISBN: 0857098845
Category : Technology & Engineering
Languages : en
Pages : 231
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Book Description
Due to its speed, low energy requirements, and the fact that it does not require a pre-drilled hole, the technique of self-piercing riveting (SPR) has been increasingly adopted by many industries as a high-speed mechanical fastening technique for the joining of sheet material components. Self-piercing riveting comprehensively reviews the process, equipment, and corrosion behaviour of self-piercing riveting, and also describes the process of evaluation and modelling of strength of self-piercing riveted joints, quality control methods and non-destructive testing.Part one provides an extensive overview of the properties of self-piercing riveting. Chapters in this section review the mechanical strength, fatigue, and corrosion behaviour of self-piercing riveted joints. The second part of the book outlines the processing and applications of SPRs, and describes the dynamic strength evaluation/crashworthiness of SPRs, and the modelling of strength of self-piercing riveted joints, before going on to discuss the assessment of the suitability of materials for self-piercing riveting. The concluding chapters describe the quality control and non-destructive testing of self-piercing riveted joints, optimization of the strength of self-piercing rivets, and provides an overview of self-piercing rivets in the automotive industry and the applications of self-piercing riveting in automated vehicle construction.Self-piercing riveting is a standard reference for engineers and designers in the aerospace, materials, welding, joining, automotive and white goods industries, as well as manufacturers of metal components for the automotive, aerospace, white goods and building industries. - Comprehensively reviews the process, equipment, and corrosion behaviour of self-piercing riveting - Describes the process of evaluation and modelling of strength of self-piercing riveted joints, quality control methods and non-destructive testing - Provides an overview of quality, optimization, applications and strength evaluations of self-piercing riveting
Author: J. F. T. Pittman
Publisher:
ISBN:
Category : Crafts & Hobbies
Languages : en
Pages : 848
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Book Description
Author: Aldo Ofenheimer
Publisher: Trans Tech Publications Ltd
ISBN: 3038269336
Category : Technology & Engineering
Languages : en
Pages : 1660
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Book Description
Selected, peer reviewed papers from the 18th International ESAFORM Conference on Material Forming (ESAFORM 2015), April 15-17, 2015, Graz, Austria
Author: B. H. V. Topping
Publisher:
ISBN: 9781874672173
Category : Computer-aided engineering
Languages : en
Pages : 0
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Book Description
Contains invited lectures presented at the Third International Conference on Engineering Computational Technology, held in Prague, Czech Republic, 4-6 September 2002. It includes contributions from: CG Armstrong, SN Atluri, AC Benim, P Bomme, D Bowman, RS Crouch, Y Dere, O Hassan, and more.
Author: Frederick Buechner
Publisher: Harper Collins
ISBN: 0060611626
Category : Religion
Languages : en
Pages : 196
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Book Description
Frederick Buechner's Godric "retells the life of Godric of Finchale, a twelfth-century English holy man whose projects late in life included that of purifying his moral ambition of pride...Sin, spiritual yearning, rebirth, fierce asceticism--these hagiographic staples aren't easy to revitalize but Frederick Buechner goes at the task with intelligent intensity and a fine readiness to invent what history doesn't supply. He contrives a style of speech for his narrator--Godric himself--that's brisk and tough-sinewed...He avoids metaphysical fiddle, embedding his narrative in domestic reality--familiar affection, responsibilities, disasters...All on his own, Mr. Buechner has managed to reinvent projects of self-purification and of faith as piquant matter for contemporary fiction [in a book] notable for literary finish...Frederick Buechner is a very good writer indeed." -- Benjamin DeMott, The New York Times Book Review "From the book's opening sentence...and sensible reader will be caught in Godric's grip...Godric glimmers brightly." -- Peter S. Prescott, Newsweek "Godric is a memorable book...a marvelous gem of a book...destined to become a classic of its kind." -- Michael Heskett, Houston Chronicle "In the extraordinary figure of Godric, both stubborn outsider and true child of God, both worldly and unworldly, Frederick Buechner has found an ideal means of exploring the nature of spirituality. Godric is a living battleground where God fights it out with the world, the Flesh, and the Devil." -- London Times Literary Supplement "Wityh a poet's sensibly and a high reverent fancy, Frederick Buechner paints a memorable portrait." -- Edmund Fuller, The Wall Street Journal
