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Author: Siegfried Fouvry
Publisher:
ISBN:
Category :
Languages : fr
Pages : 308
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Book Description
LES DEGRADATIONS OBSERVEES DANS LES CONTRATS SOUMIS A DES SOLLICITATIONS DE FRETTING APPARAISSENT SOUS DIFFERENTES FORMES EN FONCTION DES CONDITIONS DE SOLLICITATION. FONDEE SUR L'ANALYSE ELASTIQUE DU CONTACT SPHERE-PLAN, CETTE ETUDE A POUR OBJECTIF DE QUANTIFIER LES TROIS ASPECTS QUE SONT : LA CONDITION DE GLISSEMENT, L'AMORCAGE DE FISSURES EN GLISSEMENT PARTIEL ET L'USURE PAR FORMATION DE DEBRIS POUR LES GRANDES AMPLITUDES DE GLISSEMENT. ON MONTRE QUE LA CONDITION DE GLISSEMENT PEUT ETRE DECRITE A PARTIR DE TROIS VARIABLES A, B, C QUI PERMETTENT DE DEFINIR LA TRANSITION ENTRE GLISSEMENT PARTIEL ET GLISSEMENT TOTAL. LA CONDITION D'AMORCAGE A GRAND NOMBRE DE CYCLES, ETUDIEE EN GLISSEMENT PARTIEL, DEPEND DU COMPORTEMENT DU MATERIAU. POUR UN ACIER PRESENTANT UN ECROUISSAGE DU TYPE ISOTROPE (30NCD16), LE CRITERE DE DANG VAN PERMET DE QUANTIFIER LE RISQUE D'AMORCAGE DANS LE CONTACT SI L'ON TIENT COMPTE DU COEFFICIENT DE FROTTEMENT LOCAL DANS L'ANNEAU DE GLISSEMENT ET DE L'EFFET D'ECHELLE. POUR LES ACIERS FORTEMENT ALLIES, FRAGILES (SC6-5-2), IL IMPORTE DE TENIR COMPTE DES MICRO-CARBURES PRESENTS DANS L'ACIER ET D'ASSOCIER LA CONDITION DE FISSURATION A UN SEUIL DE PROPAGATION. L'USURE PAR FORMATION DE DEBRIS EN GRANDS DEBATTEMENTS EST ETUDIEE EN ASSOCIANT LA QUANTITE DE MATIERE USEE A L'ENERGIE INTERFACIALE DISSIPEE. L'ANALYSE GLOBALE EST AFFINEE PAR UNE DESCRIPTION LOCALE DE L'ENERGIE DISSIPEE DANS LE CONTACT. ON INTRODUIT DES COEFFICIENTS ENERGETIQUES D'USURE QUI MONTRENT UNE CINETIQUE DE DEGRADATION DE L'ACIER SC6-5-2 DE 9 A 10 FOIS SUPERIEURE A CELLE DU DEPOT TIN.
Author: Siegfried Fouvry
Publisher:
ISBN:
Category :
Languages : fr
Pages : 308
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Book Description
LES DEGRADATIONS OBSERVEES DANS LES CONTRATS SOUMIS A DES SOLLICITATIONS DE FRETTING APPARAISSENT SOUS DIFFERENTES FORMES EN FONCTION DES CONDITIONS DE SOLLICITATION. FONDEE SUR L'ANALYSE ELASTIQUE DU CONTACT SPHERE-PLAN, CETTE ETUDE A POUR OBJECTIF DE QUANTIFIER LES TROIS ASPECTS QUE SONT : LA CONDITION DE GLISSEMENT, L'AMORCAGE DE FISSURES EN GLISSEMENT PARTIEL ET L'USURE PAR FORMATION DE DEBRIS POUR LES GRANDES AMPLITUDES DE GLISSEMENT. ON MONTRE QUE LA CONDITION DE GLISSEMENT PEUT ETRE DECRITE A PARTIR DE TROIS VARIABLES A, B, C QUI PERMETTENT DE DEFINIR LA TRANSITION ENTRE GLISSEMENT PARTIEL ET GLISSEMENT TOTAL. LA CONDITION D'AMORCAGE A GRAND NOMBRE DE CYCLES, ETUDIEE EN GLISSEMENT PARTIEL, DEPEND DU COMPORTEMENT DU MATERIAU. POUR UN ACIER PRESENTANT UN ECROUISSAGE DU TYPE ISOTROPE (30NCD16), LE CRITERE DE DANG VAN PERMET DE QUANTIFIER LE RISQUE D'AMORCAGE DANS LE CONTACT SI L'ON TIENT COMPTE DU COEFFICIENT DE FROTTEMENT LOCAL DANS L'ANNEAU DE GLISSEMENT ET DE L'EFFET D'ECHELLE. POUR LES ACIERS FORTEMENT ALLIES, FRAGILES (SC6-5-2), IL IMPORTE DE TENIR COMPTE DES MICRO-CARBURES PRESENTS DANS L'ACIER ET D'ASSOCIER LA CONDITION DE FISSURATION A UN SEUIL DE PROPAGATION. L'USURE PAR FORMATION DE DEBRIS EN GRANDS DEBATTEMENTS EST ETUDIEE EN ASSOCIANT LA QUANTITE DE MATIERE USEE A L'ENERGIE INTERFACIALE DISSIPEE. L'ANALYSE GLOBALE EST AFFINEE PAR UNE DESCRIPTION LOCALE DE L'ENERGIE DISSIPEE DANS LE CONTACT. ON INTRODUIT DES COEFFICIENTS ENERGETIQUES D'USURE QUI MONTRENT UNE CINETIQUE DE DEGRADATION DE L'ACIER SC6-5-2 DE 9 A 10 FOIS SUPERIEURE A CELLE DU DEPOT TIN.
Author: Hasso Weiland
Publisher: Springer
ISBN: 3319487612
Category : Technology & Engineering
Languages : en
Pages : 1857
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Book Description
This is a collection of papers presented at the 13th International Conference on Aluminum Alloys (ICAA-13), the premier global conference for exchanging emerging knowledge on the structure and properties of aluminum materials. The papers are organized around the topics of the science of aluminum alloy design for a range of market applications; the accurate prediction of material properties; novel aluminum products and processes; and emerging developments in recycling and applications using both monolithic and multi-material solutions.
Author: Danah Boyd
Publisher: Yale University Press
ISBN: 0300166311
Category : Social Science
Languages : en
Pages : 296
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Book Description
Surveys the online social habits of American teens and analyzes the role technology and social media plays in their lives, examining common misconceptions about such topics as identity, privacy, danger, and bullying.
Author: Donella H. Meadows
Publisher: Universe Pub
ISBN: 9780876632222
Category : Economic development.
Languages : en
Pages : 0
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Book Description
Examines the factors which limit human economic and population growth and outlines the steps necessary for achieving a balance between population and production. Bibliogs
Author: Valentin L. Popov
Publisher: Springer
ISBN: 3662587092
Category : Science
Languages : en
Pages : 357
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Book Description
This open access book contains a structured collection of the complete solutions of all essential axisymmetric contact problems. Based on a systematic distinction regarding the type of contact, the regime of friction and the contact geometry, a multitude of technically relevant contact problems from mechanical engineering, the automotive industry and medical engineering are discussed. In addition to contact problems between isotropic elastic and viscoelastic media, contact problems between transversal-isotropic elastic materials and functionally graded materials are addressed, too. The optimization of the latter is a focus of current research especially in the fields of actuator technology and biomechanics. The book takes into account adhesive effects which allow access to contact-mechanical questions about micro- and nano-electromechanical systems. Solutions of the contact problems include both the relationships between the macroscopic force, displacement and contact length, as well as the stress and displacement fields at the surface and, if appropriate, within the half-space medium. Solutions are always obtained with the simplest available method - usually with the method of dimensionality reduction (MDR) or approaches which use the solution of the non-adhesive normal contact problem to solve the respective contact problem.
Author: Noam Eliaz
Publisher: Springer Science & Business Media
ISBN: 1461439426
Category : Technology & Engineering
Languages : en
Pages : 521
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Book Description
This book reviews the current understanding of the mechanical, chemical and biological processes that are responsible for the degradation of a variety of implant materials. All 18 chapters will be written by internationally renowned experts to address both fundamental and practical aspects of research into the field. Different failure mechanisms such as corrosion, fatigue, and wear will be reviewed, together with experimental techniques for monitoring them, either in vitro or in vivo. Procedures for implant retrieval and analysis will be presented. A variety of biomaterials (stainless steels, titanium and its alloys, nitinol, magnesium alloys, polyethylene, biodegradable polymers, silicone gel, hydrogels, calcium phosphates) and medical devices (orthopedic and dental implants, stents, heart valves, breast implants) will be analyzed in detail. The book will serve as a broad reference source for graduate students and researchers studying biomedicine, corrosion, surface science, and electrochemistry.
Author: D Landolt
Publisher: Elsevier
ISBN: 0857093738
Category : Technology & Engineering
Languages : en
Pages : 585
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Book Description
Tribocorrosion causes the degradation or alteration of materials through the combined action of corrosion and wear. It limits the performance and life-time of installations, machines and devices with moving parts, and controls certain manufacturing processes such as chemical–mechanical polishing. The effects of tribocorrosion are most pronounced on passive metals which owe their corrosion resistance to a thin protecting oxide film. Most corrosion-resistant engineering alloys belong to this category.This book provides an introduction to the developing field of tribocorrosion and an overview of the latest research. Part one reviews basic notions of corrosion and tribology, before presenting the most recent results on the growth and structure of passive oxide films. Tribocorrosion mechanisms under fretting, sliding and erosion conditions, respectively, are then discussed. Part two focuses on methods for measuring and preventing tribocorrosion. It includes chapters on electrochemical techniques, the design of tribocorrosion test equipment, data evaluation and the optimisation of materials' properties for tribocorrosion systems. Part three presents a selection of tribocorrosion problems in engineering and medicine. Three chapters address the tribocorrosion of medical implants including test methods and clinical implications. Other chapters examine tribocorrosion issues in nuclear power plants, marine environments, automotive cooling circuits, elevated-temperature metal working and chemical–mechanical polishing.With its distinguished editors and international team of expert contributors Tribocorrosion of passive metals and coatings is an invaluable reference tool for engineers and researchers in industry and academia confronted with tribocorrosion problems. - Comprehensively reviews current research on the tribocorrosion of passive metals and coatings, with particular reference to the design of tribocorrosion test equipment, data evaluation and the optimisation of materials' properties for tribocorrosion systems - Chapters discuss tribocorrosion mechanisms under fretting, sliding and erosion conditions before focussing on methods for measuring and preventing tribocorrosion - Includes a comprehensive selection of tribocorrosion problems in engineering and medicine, such as the tribocorrosion of medical implants, and tribocorrosion issues in nuclear power plants, marine environments, automotive cooling circuits and elevated-temperature metal working
Author: Paulus Kaufmann
Publisher: Springer Science & Business Media
ISBN: 9048196612
Category : Philosophy
Languages : en
Pages : 268
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Book Description
Degradation, dehumanization, instrumentalization, humiliation, and nonrecognition – these concepts point to ways in which we understand human beings to be violated in their dignity. Violations of human dignity are brought about by concrete practices and conditions; some commonly acknowledged, such as torture and rape, and others more contested, such as poverty and exclusion. This volume collates reflections on such concepts and a range of practices, deepening our understanding of human dignity and its violation, bringing to the surface interrelationships and commonalities, and pointing to the values that are thereby shown to be in danger. In presenting a streamlined discussion from a negative perspective, complemented by conclusions for a positive account of human dignity, the book is at once a contribution to the body of literature on what dignity is and how it should be protected as well as constituting an alternative, fresh and focused perspective relevant to this significant recurring debate. As the concept of human dignity itself crosses disciplinary boundaries, this is mirrored in the unique range of perspectives brought by the book’s European and American contributors – in philosophy and ethics, law, human rights, literature, cultural studies and interdisciplinary research. This volume will be of interest to social and moral philosophers, legal and human rights theorists, practitioners and students.
Author: Kenneth R. St. John
Publisher: ASTM International
ISBN: 0803114419
Category : Biological interfaces
Languages : en
Pages : 215
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Book Description
The proceedings of an October 1990 symposium in San Antonio held to address the problem of the release of particulate material debris from medical implants because of wear, physical deterioration, or the harsh chemical environment. Examines tissue responses to such debris in order to identify factors that might moderate it, such as implant material or design, or postoperatic drugs. Member price, $53. Annotation copyrighted by Book News, Inc., Portland, OR
Author: Matt Carter
Publisher: Academic Press
ISBN: 0323915612
Category : Medical
Languages : en
Pages : 416
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Book Description
Modern neuroscience research is inherently multidisciplinary, with a wide variety of cutting edge new techniques to explore multiple levels of investigation. This Third Edition of Guide to Research Techniques in Neuroscience provides a comprehensive overview of classical and cutting edge methods including their utility, limitations, and how data are presented in the literature. This book can be used as an introduction to neuroscience techniques for anyone new to the field or as a reference for any neuroscientist while reading papers or attending talks. - Nearly 200 updated full-color illustrations to clearly convey the theory and practice of neuroscience methods - Expands on techniques from previous editions and covers many new techniques including in vivo calcium imaging, fiber photometry, RNA-Seq, brain spheroids, CRISPR-Cas9 genome editing, and more - Clear, straightforward explanations of each technique for anyone new to the field - A broad scope of methods, from noninvasive brain imaging in human subjects, to electrophysiology in animal models, to recombinant DNA technology in test tubes, to transfection of neurons in cell culture - Detailed recommendations on where to find protocols and other resources for specific techniques - "Walk-through" boxes that guide readers through experiments step-by-step
