Results 221 to 230 of about 9,792 (263)
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On the friction mechanism of solid lubricants
Journal of Friction and Wear, 2011It is shown that the coefficient of friction of polycrystalline graphite materials is governed by the crystallite size and adsorption heat of the molecules making up the lubricating layer. In the absence of a lubricating layer in the actual contact zones (in vacuum, dried gases, and in air at temperatures above 200°C), graphite loses its lubricity.
Yu. N. Vasil’ev +2 more
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Nanoscale Friction Mechanisms at Solid–Liquid Interfaces
Angewandte Chemie International Edition, 20131 IMETUM und Physik Department, TUM, Boltzmannstrasse 11, 85748 Garching. 2 Ernst-Berl Institut fur Makromolekulare Chemie, TU Darmstadt, Petersenstrasse 22, 64287 Darmstadt, Germany. Fig. 1: Observed nanoscale friction mechanisms. A single polymer molecule at a solidliquid interface can respond in different ways to a lateral external force, here ...
Balzer, Bizan N. +7 more
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On the Magnitude of the Mechanical Component of Solid Friction
Journal of Applied Physics, 1949An experiment was performed in order to determine the magnitude of that portion of dry, kinetic friction which is contributed by Coulomb friction, or the mechanical interlocking of surface irregularities. The results indicate that the work of the mechanical component of friction accounts for only a few percent of the work of total measured friction.
C. D. Strang, C. R. Lewis
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The friction and the mechanical properties of solid krypton
Proceedings of the Royal Society of London. Series A. Mathematical and Physical Sciences, 1955Abstract An experimental study has been made of the frictional behaviour and of the hardness of solid krypton. It is found that the friction is nearly independent of load over the range investigated. At temperatures close to the melting point the friction is very low and the frictional behaviour is similar to that of ice.
Frank Philip Bowden, G. W. Rowe
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Quasi-Static Frictional Contact in Solid Mechanics
AIP Conference Proceedings, 2009In this paper, we consider numerical approximations of the quasi‐static contact problem with dry friction, using finite elements for the displacements and finite difference for the temporal derivative of the displacements. The quasistatic problem will be resolved step by step, such that at each step we shall calculated small strains and small ...
Nicolae Pop +3 more
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On the solid-state-bonding mechanism in friction stir welding
Extreme Mechanics Letters, 2020Abstract A critical assessment of various solid-state-bonding mechanisms is established for friction stir welding (FSW) processes of engineering alloys. The commonly assumed sintering-like diffusional-bonding hypothesis is criticized in this work as not the dominant mechanism.
Xue Wang +3 more
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Solid Friction Damping of Mechanical Vibrations
AIAA Journal, 1976A theory of solid friction damping of mechanical vibrations is presented that is based on a solid friction mathematical model previously proposed by the author. A summary and improved description of the general analytic features of the solid friction model are given as necessary background for the theory.
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The mechanism of sliding friction wear in polycrystalline solids
Technical Physics Letters, 2000A new micromechanical model describing the sliding friction wear of polycrystalline solids is proposed. The model is consistent with a hypothesis suggested previously, according to which the transition from intensive to moderate wear (for the nonconforming bodies in sliding friction contact) is related to attaining a definite, sufficiently small shear ...
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Friction Mechanisms and Fundamental Aspects in Solid Lubricant Coatings
2006In recent years, great strides have been made in the formulation of solid lubricant coatings for a wide range of industrial applications. These coatings are now available in nano-structured and/or –composite forms to provide better performance and durability even under very severe sliding conditions.
Donnet, C., Erdemir, A.
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Measurement of Mechanical Properties of Thin Solid Films II: Friction and Wear
1992The friction and wear performance of surfaces is critical to the functionality of industrial mechanisms, engines transmissions and all manner of process plants, especially with regard to their efficiency of operation and life cycle costs. Whilst typically dominated by mechanical properties, it is increasingly realised that surface chemistry also plays ...
Matthews, Allan, Holmberg, Kenneth
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