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Vie Tribologique A Chaud Et Temperature Interfaciale Dans Des Contacts Ceramiques
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Book Synopsis Vie tribologique à chaud et température interfaciale dans des contacts céramiques by :
Download or read book Vie tribologique à chaud et température interfaciale dans des contacts céramiques written by and published by . This book was released on 1998 with total page 231 pages. Available in PDF, EPUB and Kindle. Book excerpt: Le frottement et l'usure de différents couples de céramiques oxydes (alumines) et non-oxyde (carbure de tungstène à liant cobalt) ont été étudiés à température ambiante et à haute température en s'attachant à mettre en reliéf l'incidence des phénomènes thermiques sur le comportement tribologique de ces matériaux. Un montage expérimental à tout d'abord été concu et réalisé spécialement pour cette étude. Il permet la conduite d'essais de frottement en configuration pion-disque de l'ambiance à 900°C dans un large domaine de charges. Un modèle thermique a été élaboré afin d'évaluer les températures moyennes et éclairs dans un contact frottant en prenant en compte les conditions aux limites imposées par le montage expérimental. Les résultats sont exploités sous forme de cartes de températures spécifiques à un couple de matériaux et à un coéfficiant de frottement donné. L'étude tribologique met tout d'abord en évidence puis caractérise les discontinuités de comportement en frottement et usure à 20 et 800°C de deux alumines à 99,7% et 94% de pureté. L'analyse en continue de l'usure associée aux observations microscopiques permettent de reconstituer la vie du contact en mettant en relief l'influence de la température d'essai et de la température générée par le frottement. Le frottement d'un cermet carbure de tungstène à 6% de cobalt à ensuite été étudié en frottement face à lui même et face à des disques d'alumine. Des essais à 20 et 600°C mettent en évidence des phénomènes tribochimiques thermiquement actives. L'usure tribochimique par consommation et renouvellement des couches d'oxydes est le principal phénomène qui participe à l'évolution du comportement tribologique du carbure de tungstène.
Book Synopsis Lubrication at the Frontier: The Role of the Interface and Surface Layers in the Thin Film and Boundary Regime by : M. Priest
Download or read book Lubrication at the Frontier: The Role of the Interface and Surface Layers in the Thin Film and Boundary Regime written by M. Priest and published by Elsevier. This book was released on 1999-07-01 with total page 911 pages. Available in PDF, EPUB and Kindle. Book excerpt: The 25th Leeds-Lyon Symposium on Tribology was held at the Institut des Sciences Appliquées de Lyon, from 8-11th September, 1998. Its central theme was, "Lubrication at the frontier: the role of the interface and surface layers in the thin film and boundary regime". This topic was chosen because it represents an important evolution of the research field.The Symposium opened with a keynote address entitled "Role of surface-anchored polymer chains in polymer friction" which described the processes taking place at the interface between "solid" and "liquid". The keynote address was followed by two invited lectures. Firstly, "Fuel efficient engine oils, additive interactions, boundary friction and wear" presented the industrial point of view on lubricant formulation and engine testing and its evolution. The second lecture was entitled "For establishment of a new EHL theory" and stressed the need to extend the current EHL theory.Beginning in 1974, The Leeds-Lyon Symposia have now covered a wide range of topics. The essential aim each year is to select a topic of current interest to tribologists and to contribute to further the advance of knowledge in selected fields.
Book Synopsis Surface Modification Technologies: Proceedings of the 20th International Conference on Surface Modification Technologies by : T. S. Sudarshan
Download or read book Surface Modification Technologies: Proceedings of the 20th International Conference on Surface Modification Technologies written by T. S. Sudarshan and published by ASM International. This book was released on 2007-01-01 with total page 155 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Flexoelectricity in Liquid Crystals by : Agnes Buka
Download or read book Flexoelectricity in Liquid Crystals written by Agnes Buka and published by World Scientific. This book was released on 2013 with total page 299 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Nonlinear Optical Materials by : Jerome V. Moloney
Download or read book Nonlinear Optical Materials written by Jerome V. Moloney and published by Springer Science & Business Media. This book was released on 1998-08-13 with total page 270 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
