Ultrasonic Fretting Wear of an Austenitic Stainless Steel PDF Download

Author: Danesh Nikoonezhad
Publisher:
ISBN:
Category : Austenitic stainless steel
Languages : en
Pages : 216

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Author: Radoslaw Rybiak
Publisher:
ISBN:
Category :
Languages : en
Pages : 194

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Book Description
L'usure par fretting qui est considérée comme une nuisance dans plusieurs branches de l'industrie telles que l'aéronautique, l'industrie nucléaire, etc., consiste en la dégradation de la surface en contact résultant de l'usure qui nécessite une rémise en état ou un remplacement des éléments des machines. Elle est définie comme l'usure qui a lieu pendant un mouvement oscillatoire de faible amplitude entre deux solides apparement immobiles sous une charge normale à la surface de contact. Un tel phénomène est observé surtout dans les assemblages soumis à des vibrations. Dans le cadre de la Thèse, on a étudié le couple tribologique acier Jethete M152 contre acier A-286 à des temperératures élevées afin de créer des conditions identiques à celles qui existent dans un système d'aube de redresseur à calage variable (RCV) d'un compresseur à haute pression d'un moteur double corps-double flux GE90-115B (Fig. 1). En faisant l'analyse des conditions de travail dans un système RCV on peut considérer le processus d'usure d'une douille (eng. bushing) stationnaire en contact avec un pivot d'aube (vane trunnion) de redresseur. Le mécanisme d'usure correspond à un processus de fretting torsion. Cependant, dans la thèse, on a étudié un fretting type de glissements alternés entre la douille et le pivot sous une sollicitation normale équivalente à une force d'interaction induite par un flux d'air. En effet, nos moyens expérimentaux actuels ne nous permettent pas d'étudier les phénoménes d'usure par torsion. Le mémoire est composé de quatre chapitres. Dans le premier chapitre on réalise une synthèse bibliographique du phénoméne fretting. La problèmatique industrielles est détaillée. Dans le 2ème chapitre sont présentés les matériaux utilisés, les moyens experimentaux utilisés ainsi que le formalisme mécanique et ainsi que la méthode de calcul du volume d'usure. Dans le 3ème chapitre l'auteur mène une discussion sur les résultats de fretting sous des sollicitations invariables avec une prise en considération de l'effet de la température sur le comportement tribologique du système étudié. Une analyse approfondie de l'évolution de l'interface en fonction de la température y est présentée. Dans le 4ème chapitre l'usure par fretting est étudiée pour des sollicitations variables équivalentes à celles qui agissent dans le système RCV. On discute de la dynamique d'évolution du troisième corps sous une température variable pendant un seul essai de fretting. Une carte de fretting-usure de l'activation de la couche 'glaze' en fonction de la température, de l'amplitude de déplacement et de pression est présentée. En utilisant la propriété d'additivité de l'énergie dissipée, une loi 'composite' de l'usure est introduite.

Author: Robert C. Bill
Publisher:
ISBN:
Category : Fretting corrosion
Languages : en
Pages : 24

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Book Description

Author: Christophe Donnet
Publisher: Springer Science & Business Media
ISBN: 0387498915
Category : Technology & Engineering
Languages : en
Pages : 673

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Book Description
This book highlights some of the most important structural, chemical, mechanical and tribological characteristics of DLC films. It is particularly dedicated to the fundamental tribological issues that impact the performance and durability of these coatings. The book provides reliable and up-to-date information on available industrial DLC coatings and includes clear definitions and descriptions of various DLC films and their properties.

Author: Robert C. Bill
Publisher:
ISBN:
Category : Fretting corrosion
Languages : en
Pages : 24

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Book Description
Fretting fatigue experiments conducted on 304 stainless steel using a flexural-fatigue test arrangement with bolted-on fretting pads have demonstrated that fatigue life is reduced by at least a factor of 10 in the 265- to 334-MPa (38,500- to 48,500-psi) nominal-flexural-fatigue-stress range. In addition, experiments in which the fretting pads were removed after selected numbers of cycles, followed by continued flexural fatigue without fretting show that continued fretting beyond 50,000 cycles does not significantly further reduce fatigue life of 304 stainless steel at 317 MPa (46,000 psi). Microscopic examination of the fretted contact areas revealed fracture initiation sites as well as numerous cracks that did not propagate to failure. Flexural fretting fatigue experiments performed on mild steel showed an insensitivity of fatigue life to the incidence of fretting under flexural stress conditions of from 162 to 217 MPa (23,500 to 31,500 psi).

Author: Joseph R. Davis
Publisher: ASM International
ISBN: 9780871705037
Category : Technology & Engineering
Languages : en
Pages : 594

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Book Description
ASM Specialty Handbook® Stainless Steels The best single-volume reference on the metallurgy, selection, processing, performance, and evaluation of stainless steels, incorporating essential information culled from across the ASM Handbook series. Includes additional data and reference information carefully selected and adapted from other authoritative ASM sources.

Author: Peter Leonard Hurricks
Publisher:
ISBN:
Category : Fretting corrosion
Languages : en
Pages :

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Author: Gwidon W. Stachowiak
Publisher: Elsevier
ISBN: 9780750673044
Category : Technology & Engineering
Languages : en
Pages : 774

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Book Description
Mechanisms of wear, friction and lubrication are comprehensively described in an accessible manner that is designed to be helpful to non-specialists. The control of wear is given extensive treatment with a thorough discussion of lubricant additives, solid lubricants and surface coatings. The effectiveness of coatings in suppressing specific forms of wear is described together with the methods of coating deposition. More than 1000 references are provided to give the reader access to more specialized information if required.

Author: P. A. Dearnley
Publisher: Cambridge University Press
ISBN: 1316785084
Category : Technology & Engineering
Languages : en
Pages : 798

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Book Description
This highly illustrated reference work covers the three principal types of surface technologies that best protect engineering devices and products: diffusion technologies, deposition technologies, and other less commonly acknowledged surface engineering (SE) techniques. Various applications are noted throughout the text and additionally whole chapters are devoted to specific SE applications across the automotive, gas turbine engine (GTE), metal machining, and biomedical implant sectors. Along with the benefits of SE, this volume also critically examines SE's limitations. Materials degradation pathways - those which can and those which cannot be mitigated by SE - are rigorously explained. Written from a scientific, materials engineering perspective, this concise text is supported by high-quality images and photo-micrographs which show how surfaces can be engineered to overcome the limits of conventionally produced materials, even in complex or hostile operating environments. This book is a useful resource for undergraduate and postgraduate students as well as professional engineers.

Author: Jean-Pierre Celis
Publisher: Routledge
ISBN: 1351546937
Category : Technology & Engineering
Languages : en
Pages : 272

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Book Description
This first edition of Testing Tribocorrosion of Passivating Materials Supporting Research and Industrial Innovation: A Handbook treats in a clear, concise, and practical manner an important material degradation and protection matter. It is designed as a handbook and provides a well structured approach of the basics needed to investigate the tribocorrosion behavior of passivating materials, and to conduct in a correct way a laboratory investigation on it. It provides answers on practical and theoretical approaches of tribocorrosion phenomena to engineers and medical persons involved with material assemblies subjected to aggressive environmental and mechanical conditions. For academic researchers it is a pertinent tool assisting them in how they can perform a tribocorrosion investigation and obtain results that are correctly interpreted and can be exchanged. Different parts of the book are illustrated with practical examples. This handbook is truly an indispensable guide for every professional who comes into contact with the complex material degradation and protection processes that take place under combined corrosion and wear conditions. Fields of interest include: transportation (aeronautics, maritime, rail, automotive), medical implants (orthopaedics, dentistry), biochemistry, food production, energy production, and machining. The coordination of this handbook writing was done by Professor Jean-Pierre Celis (Katholieke Universiteit Leuven, Belgium) and Professor Pierre Ponthiaux (Ecole Centrale Paris, France) assisted by twelve European experts who contributed jointly to the nine chapters of this handbook. Main topics dealt with are tribocorrosion phenomena in medical and industrial sectors, depassivation and repassivation phenomena, impact on synergism in tribocorrosion, specific testing techniques, coupling tribology-to-corrosion, design of a testing protocol, and normalisation.