Sliding Friction Download Ebook PDF Epub Online

Author : Bo N.J. Persson
Publisher : Springer Science & Business Media
Release : 2013-03-14
Page : 463
Category : Science
ISBN 13 : 3662036460
Description :


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.


Author : Bo N.J. Persson
E. Tosatti
Publisher : Springer Science & Business Media
Release : 2013-04-17
Page : 460
Category : Science
ISBN 13 : 9401587051
Description :


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 quite independently and spontaneously. This volume contains contributions from leading scientists on fundamental aspects of sliding friction. Some problems considered are: What is the origin of stick-and-slip motion? What is the origin of the rapid processes taking place within a lub at low sliding velocities? On a metallic surface, is the rication layer electronic or phononic friction the dominating energy dissipation pro cess? What is the role (if any) of self-organized criticality in sliding friction? How thick is the water layer during sliding on ice and snow? These and other questions raised in this book are of course only part ly answered: the topic of sliding friction is still in an early state of development.


Author : Shiro Kobayashi
Publisher :
Release : 1957
Page : 116
Category : Friction
ISBN 13 :
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Author : Alfred Gordon MacDonald
Publisher :
Release : 1960
Page : 112
Category : Friction
ISBN 13 :
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Author : Bo Persson
E. Tosatti
Publisher : Springer
Release : 2014-03-14
Page : 460
Category : Science
ISBN 13 : 9789401587068
Description :


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 quite independently and spontaneously. This volume contains contributions from leading scientists on fundamental aspects of sliding friction. Some problems considered are: What is the origin of stick-and-slip motion? What is the origin of the rapid processes taking place within a lub at low sliding velocities? On a metallic surface, is the rication layer electronic or phononic friction the dominating energy dissipation pro cess? What is the role (if any) of self-organized criticality in sliding friction? How thick is the water layer during sliding on ice and snow? These and other questions raised in this book are of course only part ly answered: the topic of sliding friction is still in an early state of development.


Author : Herbert Mark Stanley
Publisher :
Release : 1993
Page : 266
Category :
ISBN 13 :
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Author : Donald H. Buckley
Publisher :
Release : 1968
Page : 21
Category : Adhesion
ISBN 13 :
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Author : Robert L. Johnson
Publisher :
Release : 1952
Page : 29
Category : Bearings (Machinery)
ISBN 13 :
Description :


Wear and sliding friction properties of a number of nickel alloys operating against hardened SAE 52100 steel were studied. The alloys were cast beryllium nickel, heat-treated beryllium nickel, cast Inconel, Nimonic 80, Inconel X, Refractalloy 26, and Discaloy. Some of the allows studied may be useful as material for cages of rolling-contact bearings that operate at high speeds with temperatures above 600 degrees F in projected aircraft turbine engines or for bearings that operate in corrosive mediums. Desirable operating properties and the absence of extreme mass welding of all the materials could be associated with the development of the sliding surfaces of a naturally formed film of nickel oxide. On the basis of wear and friction properties, cast Inconel performed very well in these experiments and compares favorably with nodular iron. Nimonic 80 also showed promise as a possible cage material.


Author : Bo Persson
Publisher :
Release : 2014-01-15
Page : 476
Category :
ISBN 13 : 9783662036471
Description :



Author : Jane Jellison
Roamer Predmore
Publisher :
Release : 1968
Page : 16
Category : Copper alloys
ISBN 13 :
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Author : Song He
Publisher :
Release : 2008
Page : 233
Category : Floquet theory
ISBN 13 :
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Abstract: This study examines the salient effects of sliding friction on spur and helical gear dynamics and associated vibro-acoustic sources. First, new dynamic formulations are developed for spur and helical gear pairs based on a periodic description of the contact point and realistic mesh stiffness. Difficulty encountered in existing discontinuous models is overcome by characterizing a smoother transition during the contact. Frictional forces and moments now appear as either excitations or periodically-varying parameters, since the frictional force changes direction at the pitch point/line. These result in a class of periodic ordinary differential equations with multiple and interacting coefficients. Predictions match well with a benchmark finite element/contact mechanics code and/or experiments. Second, new analytical solutions are constructed which provide an efficient evaluation of the frictional effect and a more plausible explanation of dynamic interactions in multiple directions. Both single- and multi-term harmonic balance methods are utilized to predict dynamic mesh loads, friction forces and pinion/gear displacements. Such semi-analytical solutions explain the presence of higher harmonics in gear noise and vibration due to exponential modulations of periodic parameters. This knowledge also analytically reveals the effect of the tooth profile modification in spur gears under the influence of sliding friction. Further, the Floquet theory is applied to obtain closed-form solutions of the dynamic response for a helical gear pair, where the frictional effect is quantified by an effective piecewise stiffness function. Analytical predictions are validated using numerical simulations. Third, an improved source-path-receiver vibro-acoustic model is developed to quantify the effect of sliding friction on structure-borne noise. Interfacial bearing forces are predicted for the spur gear source sub-system given two whine excitations (static transmission error and sliding friction). A computational model of the gearbox, with embedded bearing stiffness matrices, is developed to characterize the motilities of structural paths. Radiated sound pressure is then estimated by using the Rayleigh integral method and a substitute source technique. Predicted pressures match well with measured noise data over a range of operating torques. In particular, the proposed vibro-acoustic model quantifies the contribution of sliding friction, which could be significant when the transmission error is minimized through tooth modifications.


Author :
Publisher :
Release : 1991
Page : 20
Category :
ISBN 13 :
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Solid friction is considered by some to be a fundamental property of two contacting materials, while others consider it to be a property of the larger tribosystem in which the materials are contained. A set of sliding friction experiments were designed to investigate the hypothesis that the unlubricated sliding friction between two materials is indeed a tribosystems-related property and that the relative influence of the materials properties or those of the machine on friction varies from one situation to another. Three tribometers were used: a friction microprobe (FMP), a typical laboratory-scale reciprocating pin-on-flat device, and a heavy-duty commercial wear tester. The slider material was stainless steel (AISI 440C) and the flat specimen material was an ordered alloy of Ni3Al (IC-50). Sphere-on-flat geometry was used at ambient conditions and at normal forces ranging from 0.01 N to 100 N and average sliding velocities of 0.01 to 100.0 mm/s. The nominal, steady-state sliding friction coefficient tended to decrease with increases in normal force for each of the three tribometers, and the steady state value of sliding friction tended to increase as the mass of the machine increased. The variation of the friction force during sliding was also a characteristic of the test system. These studies provide further support to the idea that the friction of both laboratory-scale and engineering tribosystems should be treated as a parameter which may take on a range of characteristic values and not conceived as having a single, unique value for each material pair.


Author : Donald H. Buckley
Publisher :
Release : 1967
Page : 15
Category : Platinum group
ISBN 13 :
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Author : Bernard J. Hamrock
Publisher :
Release : 1974
Page : 44
Category : Ball-bearings
ISBN 13 :
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Author : B. M. Goldovski
Canada. Defence Research Board
Publisher :
Release : 1955
Page : 16
Category : Snow mechanics
ISBN 13 :
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Author : Chester John Mackson
Publisher :
Release : 1962
Page : 210
Category : Agricultural machinery
ISBN 13 :
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Author : PR. Francis
CA. Zozula
Publisher :
Release : 1990
Page : 18
Category : Boundary friction
ISBN 13 :
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Estimates of the coefficients of limiting and sliding friction for two selected shoes and two pedestrian surfaces were obtained from two separate procedures. Data generated from a procedure in which a weighted shoe was pulled across the surfaces were compared with data generated from a subject wearing the same shoes who performed a sliding maneuver on the surfaces. The sliding maneuver produced a wider range of loading conditions and consistently higher values of the coefficients of friction than the pulling tests. It was concluded that the magnitudes of coefficients of friction vary with the rate of loading. Values of the coefficients of friction showed variability from one trial to the next under each loading condition examined. Therefore it is recommended that empirically determined estimates of coefficients of friction should include some measure of variability.


Author : HÃ¥kan Olsson
Publisher :
Release : 1994
Page : 114
Category : Dental instruments and apparatus
ISBN 13 :
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Author : Angela Grace Joy V. Dayo
Publisher :
Release : 1998
Page : 202
Category : Friction
ISBN 13 :
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Author :
Publisher :
Release : 2015
Page :
Category :
ISBN 13 :
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