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Engineering tribology, fourth edition
An introductory reference focusing on the key concepts and engineering implications of tribology, the book brings together the relevant knowledge from different fields needed to achieve effective analysis and control of friction and wear. Updated to cover recent advances in tribology, this new edition includes new sections on ionic and mesogenic lubricants, surface texturing, and multiscale characterization of 3D surfaces and coatings. Current trends in nanotribology are discussed, such as those relating to lubricants, coatings and composites, and geotribology is introduced. This book offers a comprehensive overview of the mechanisms of wear, lubrication and friction in an accessible manner designed to aid novice engineers, non-specialists and students; Provides a reader-friendly approach to the subject using illustrations to break down the typically complex problems associated with tribology; and ncludes end-of-chapter problems to test understanding, with solutions provided.
eBook
Tribology research trends
Tribology is the science and technology of interacting surfaces in relative motion. It includes the study and application of the principles of friction, lubrication and wear. The study of tribology is commonly applied in bearing design but extends into almost all other aspects of modern technology, even to such unlikely areas as hair conditioners and cosmetics such as lipstick, powders and lip-gloss. Any product where one material slides or rubs over another is affected by complex tribological interactions, whether lubricated like hip implants and other artificial prosthesis or unlubricated as in high temperature sliding wear in which conventional lubricants can not be used but in which the formation of compacted oxide layer glazes have been observed to protect against wear. The wateriness of oil during foot wiping operations may be observed by the Mavis-Bootlace test. Outcomes are typically modelled in the 4-Litre-Poulner hypothesis. Tribology plays an important role in manufacturing. In metal-forming operations, friction increases tool wear and the power required to work a piece. This results in increased costs due to more frequent tool replacement, loss of tolerance as tool dimensions shift, and greater forces are required to shape a piece. A layer of lubricant which eliminates surface contact virtually eliminates tool wear and decreases needed power by one third. This book presents the latest research in the field from around the globe.
eBook
Tribology and sustainability
\"This book brings a vision of promoting greener, cleaner, and eco-friendly environment highlighting sustainable solutions in tribology via development of self-lubricating materials, green additives in lubricants, natural fiber reinforced materials and biomimetic approaches. Backed by supporting schematic diagrams, data tables and illustrations for easy understanding, it focusses on the recent advancements in tribology and sustainability. Global sustainability and regional requirements are addressed through chapters on natural composites, green lubricants, biomedical and wind energy systems with a dedicated chapter on Global Sustainability Scenario. Features: Highlights sustainability via new tribological approaches and how such methods are essential. Covers theoretical aspects of various tribological topics concerning mechanical and material designs for energy-efficient systems. Includes practical global sustainability based on the regional requirement of tribological research and sustainable impact. Reviews tribology of green lubricants, green additives, and lightweight materials. Discusses topics related to biomimetics and bio-tribology. This book aims at researchers, professionals and graduate students in Tribology, Surface Engineering, Mechanical Design, Materials Engineering, including Mechanical, Aerospace, Chemical and Environmental Engineering\"-- Provided by publisher.
Book
Tribological Properties of Carbon Fabric/Epoxy Composites Filled with FGr@MoSsub.2 Hybrids under Dry Sliding Conditions
Hybrids of fluorinated graphite/MoS[sub.2] (FGr@MoS[sub.2]) were prepared via a hydrothermal method and used as lubricating additives to take full advantage of the synergy between FGr and MoS[sub.2] in carbon-fiber-reinforced polymer (CFRP). The results show a 21.6% reduction in the friction coefficient compared to the neat sample when the CFRP was filled with 1.2 wt.% FGr@MoS[sub.2] hybrids. The addition of 1.5 wt.% FGr@MoS[sub.2] resulted in a 60.9% reduction in the wear rate compared to neat CFRP. For the 1.2 wt.% FGr@MoS[sub.2]-reinforced CFRP, the friction coefficient maintained a relatively steady value of approximately 0.46 at various temperatures, indicating frictional stability. However, the wear rate increased by 13.95% at 60 °C compared to that at room temperature. The interfacial bonding force between the FGr@MoS[sub.2] hybrid and the matrix, as well as the adhesive force with the surface of the counterpart ball, is improved, caused by the heterostructure of FGr@MoS[sub.2], resulting in enhanced mechanical properties and formation efficiency as well as the transfer film on the surface of the counterpart ball. The results suggest that an FGr@MoS[sub.2] micro-nano structure is a promising additive to be applied in polymer tribology.
Journal Article
Analysis and compensation of kinetic friction in robotic and mechatronic control systems
\"Analysis and Compensation of Kinetic Friction in Robotic and Mechatronic Control Systems comprehensively covers the theory behind kinetic friction, as well as compensation methods and practical solutions, and serves as a key companion to studying different control systems. Beginning with a clear introduction to the subject, the book goes on to include three main facets of kinetic friction, starting with phenomena of kinetic friction in drives. Following on from this, the book examines motion dynamics with friction, which introduces dynamic system equations and focuses on both energy balance and dissipation. Finally, it explains compensation of friction in motion control, which summarises key compensation methods in controlled mechanical systems. Introducing various basic feedback control methods, including observer-based methods to compensate for kinetic friction, the book provides practical information which can be used in a wide variety of contexts not specific to particular systems or applications. The book will be of interest to students and industry workers in the field of robotics, mechanical systems and control engineering\"-- Provided by publisher.
BOOK
POSS-Grafted PI/MoSsub.2 Gradient Composite Coatings with Enhanced Tribological Properties Under Atomic Oxygen Irradiation
The irradiation of atomic oxygen (AO) severely restricts the application of polymeric lubricating coatings in low Earth orbit (LEO). Herein, octa- and mono-amino polyhedral oligomeric silsesquioxanes (POSSs) were chemically bonded onto polyimide/molybdenum disulfide (PI/MoS[sub.2]) composite coatings with a gradient structure based on Si density. The gradient coatings presented better wear resistance under different loads; notably, the wear rate decreased by 83.5%. Additionally, the effects of AO exposure on the surface morphologies, chemical structure, and tribological properties of the gradient coatings were investigated in detail. The results indicated that the mass loss and wear rates under AO irradiation decreased significantly, which can be attributed to the passivated network-like SiO[sub.2] layer that covered the coating surface after AO irradiation. As a result, the addition of POSS significantly improved the tribological properties and AO resistance.
Journal Article
Friction Optimization through Mass Finishing: Adjusting Run-in and Friction Behavior via Topography/Reibungsoptimierung durch Gleitschleifen: Das Einlauf- und Reibverhalten uber Topographie einstellen
Mass finishing is able to achieve tribological surface optimization through improved surface topography and a modified surface zone structure. The running-in behavior includes both topographical aspects and aspects of the formation of a third body. By means of surface finishing to different levels of roughness, the topographical run-in can be shortened and the formation of the third body can be influenced. Favorable running-in behavior is made possible by conditioning effects, for example in the structure, by a finishing process with a suitable input of frictional energy. Keywords Mass finishing, surface optimization, running-in behavior, surface finishing Gleitschleifen ist in der Lage, eine tribologische Oberflachenoptimierung durch verbesserte Oberflachentopographie und ein verandertes Randzonengefiige zu erreichen. Das EinlaufVerhalten beinhaltet sowohl topographische Aspekte als auch Aspekte der Ausbildung eines dritten Korpers. Mittels Oberflachenfinish auf unterschiedliche Rauheitsniveaus kann sowohl der topographische Einlauf verkurzt als auch die Ausbildung des dritten Korpers beeinflusst werden. Ein gunstiges EinlaufVerhalten wird durch Konditionierungseffekte, etwa im Gefuge, durch ein Finish-Verfahren mit geeignetem Reibungsenergieeintrag ermoglicht. Schlusselworter Gleitschleifen, Oberflachenoptimierung, EinlaufVerhalten, Oberflachenfinish
Journal Article