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Sliding Friction
Sliding friction is one of the oldest problems in physics and certainly one of the most important from a practical point of view. The ability to produce durable low-friction surfaces and lubricant fluids has become an important factor in the miniaturization of moving components in many technological devices, e.g., magnetic storage, recording systems, miniature motors and many aerospace components. This book will be useful to physicists, chemists, materials scientists, and engineers who want to understand sliding friction. The book (or parts of it) could also form the basis for a modern undergraduate or graduate course on tribology.
Physics of Sliding Friction
The study of sliding friction is one of the oldest problems in physics, and certainly one of the most important from a practical point of view. Low-friction surfaces are in increasingly high demand for high-tech components such as computer storage systems, miniature motors, and aerospace devices. It has been estimated that about 5% of the gross national product in the developed countries is "wasted" on friction and the related wear. In spite of this, remarkable little is understood about the fundamental, microscopic processes responsible for friction and wear. The topic of interfacial sliding has experienced a major burst of in terest and activity since 1987, much of which has developed quit...
Electromagnetic Fluctuations at the Nanoscale
This book provides a general formalism for the calculation of the spectral correlation function for the fluctuating electromagnetic field. The procedure is applied to the radiative heat transfer and the van der Waals friction using both the semi-classical theory of the fluctuating electromagnetic field and quantum field theory. Applications of the radiative heat transfer and non-contact friction to scanning probe spectroscopy are presented. The theory gives a tentative explanation for the experimental non-contact friction data. The book explains that radiative heat transfer and the van der Waals friction are largely enhanced at short separations between the bodies due to the evanescent elect...
Viscoelastic Interfaces Driven in Disordered Media
This book offers an in-depth study of two well-known models of “avalanche” dynamics, modified minimally by the inclusion of relaxation. Many complex systems respond to continuous inputs of energy by accumulation of stress over time, interrupted by sudden energy releases called avalanches. The first model studied is the viscoelastic interface driven over disorder, which is shown to display the fundamental features of friction. In the mean-field limit, the friction force derived semi-analytically is compatible with laboratory experiments (displaying both velocity weakening and contact aging). In two dimensions, large-scale numerical simulations are in good agreement with the basic features of real earthquakes (Gutenberg-Richter Law, aftershock migration). The second model is a non-Markovian variant of Directed Percolation, in which we observe that the universality class is only partly modified by relaxation, a promising finding with respect to our first model.
Captain Scott: Icy Deceits and Untold Realities
This expertly written book is nothing less than a daring challenge to the prevailing views of Captain Robert F. Scott’s journey to the South Pole and consequent disaster. Borrowing from various scientific disciplines, Krzysztof Sienicki lucidly argues against each of the presumed causes of Captain Scott and his companions’ deaths. In particular, he demolishes the notions of extreme low temperatures, ferocious winds, and food/fuel shortages as the main causes of the disaster. Using neural network computer simulations, he proves that the Extreme Cold Snap, Never Ending Gale, and food/fuel scarcity never occurred. By eliminating the alleged causes of the disaster, the author provides data and arguments that the deaths (Scott, Wilson and Bowers) were a matter of choice rather than fate. The choice was made long before there was an actual end of food/fuel and long before the end of the physical strength needed to reach delusive salvation at One Ton Depôt.
Noise and Vibration in Friction Systems
The book analyzes the basic problems of oscillation processes and theoretical aspects of noise and vibration in friction systems. It presents generalized information available in literature data and results of the authors in vibroacoustics of friction joints, including car brakes and transmissions. The authors consider the main approaches to abatement of noise and vibration in non-stationary friction processes. Special attention is paid to materials science aspects, in particular to advanced composite materials used to improve the vibroacoustic characteristics of tribopairs The book is intended for researchers and technicians, students and post-graduates specializing in mechanical engineering, maintenance of machines and transport means, production certification, problems of friction and vibroacoustics.
Superlubricity
Superlubricity is defined as a sliding regime in which friction or resistance to sliding vanishes. It has been shown that energy can be conserved by further reducing/removing friction in moving mechanical systems and this book includes contributions from world-renowned scientists who address some of the most fundamental research issues in overcoming friction. Superlubricity reviews the latest methods and materials in this area of research that are aimed at removing friction in nano-to-micro scale machines and large scale engineering components. Insight is also given into the atomic-scale origins of friction in general and superlubricity while other chapters focus on experimental and practical aspects or impacts of superlubricity that will be very useful for broader industrial community.* Reviews the latest fundamental research in superlubricity today* Presents 'state-of-the-art' methods, materials, and experimental techniques* Latest developments in tribomaterials, coatings, and lubricants providing superlubricity
Tribologie von Radial-Wellendichtungen
Dichtungen spielen für die Funktion von Maschinen eine zentrale Rolle. Sie verhindern den Austritt von Schmierstoffen aus dem Innenraum in die Umgebung und das Eindringen von Schmutz von Auÿen. Neben einer möglichst guten Abdichtung ist jedoch auch die durch die Dichtung auftretende Reibung von immer gröÿerer Bedeutung für die Funktionalität von Maschinen und Anlagen. Aus diesem Grund wird in der vorliegenden Arbeit untersucht, welche wesentlichen Einflussfaktoren das Reibmoment, bzw. den Reibwert von Radialwellendichtungen, beeinflussen. Experimentelle Untersuchungen erfolgen dafür an einem speziell entwickelten Versuchstand. Dabei wird ersichtlich, dass die Umfangsgeschwindigkeit, ...
