Трение и износ, 2000, Vol.21, No.1
/ Издания академии / Научные журналы
Трение и износ, 2000, Vol.21, No.1
Том 21, номер 1; январь-февраль, 2000
СОДЕРЖАНИЕ
СТАТЬИ
Zharov I.A.
Distribution of tangent stresses over contact spots on bodies rolling with sliding. pp. 5--10
Summary: Formulas are advanced to approximate tangential forces in each spot of contact between bodies rolling with slippage. These formulas have served to calculate the creep curves for several variants of the Hertzian contact.
Nasibov N.A.
Some generalization of the Euler problem of the mechanics of friction of flexible fiber. pp. 11--14
Summary: Some generalization of the Euler problem of the mechanics of friction of a flexible weightless fiber is advances when it slides over a round rough cylinder. A more general law of friction is applied, sliding is assumed to follow a screw line. The obtained calculated dependencies are demonstrated. The Eyler solution is derived for a particular case.
Bereznyakov A.I.
The effect of the friction surface layer upon he pattern of energy dissipation in a tribounit. pp. 15--18
Summary: A quantitative correlation has been established between external and internal friction of perfect materials. A dependence has been derived of friction upon the surface layer thickness and sliding velocity. It is demonstrated the force of friction reduces as the layer becomes thinner and the sliding velocity increases.
Volosnikov D.V., Skripov P.V., Starostin A.A.
Modeling thermal processes in a metal-polymer system using controllable pulse heating technique. pp. 19--25
Summary: A technique of controllable pulse heating of low-inertia wire probe has been developed allowing to investigate the processes of heat transfer in the locally overheated microvolume of a metal-polymer tribosystem. The mode of heat stabilization of the probe at a given (random) temperature has been employed for consecutive scanning of "momentary" thermophysical behavior of the polymeric fluid in its short-living states. It has been revealed that heat resistance of the polymer increases significantly as a function of temperature.
Chichinadze A.V., Sinaiskii V.M.
Model tests of specimens of friction couples from high-carbon frictional composite materials for resistance to vibration and frictional autovibrations. pp. 26--32
Summary: Results of model tests of high-carbon frictional composite materials used in loaded multidisk aircraft wheels are analyzed in order to estimate their better resistance to vibration induced by friction during braking after landing.
Yuansheng J., Shenghua L.
Optimization of tribological coatings for high-temperature lubrication. Concept of chemoengineering of tribosurfaces. pp. 33--40
Summary: Tailoring of functional coatings which is intended for high-temperature lubrication of the piston ring and cylinder liner of low heat rejection (LHR) engines, belongs to the dynamically advanced field of Coatings Tribology. Chemistry of the tribopair and interfacial media is of the utmost concern in optimizing the main lubrication regimes for high-temperature applications, and consideration of the interactions between the tribocomponents in a tribosystem in view of their chemistries leads to a concept of chemoengineering. In accordance with the concept, the optimization of both surface coatings and lubricants (base constituent plus additives) relies on the delicate balance of their chemical functions. Based on the analysis of the real friction pairs, two principles were derived to justify the concept: the first is the tribo-catalytic carbonization and graphitization of base constituent by tribological coatings, and the other is the selective adsorptions and reactions of additive molecules on tribological coatings following by the HSAB (hard-soft acid-base) principle. These qualitative rules are serve as guide for the optimization of tribological coatings for high-temperature lubrication.
Rodnenkov V.G., Kupchinov B.I.
Tribological behavior of liquid crystalline cholesterine compounds. pp. 41--46
Summary: Experimental results have served to manifest the relationship between the behavior of liquid crystalline cholesterine n-alcanoates (CA) and their molecular structure. It is demonstrated that the CA solubility in vaseline oil reduces as the alkyl radical becomes longer and the system becomes more viscous. The lubricity of individual CA is governed by heir molecular mass. As the alkyl radical in CA becomes longer, the stress of drawing a specimen reduces and the wear spot diameter increases. An inverse correlation has been established between the stress of drawing and the enthalpy of melting of CA. The load carrying capacity and the friction coefficient of oils containing CA depend upon he temperature of transition to the isotropic phase. It has been observed that the friction coefficient tends to reduce and the load carrying capacity tends to increase as the temperature of this phase transition goes up.
Mashkov Yu.K., Gladenko A.A., Kalistratova L.F., Ovchar Z.N., Mamaev O.A.
The structure and properties of polyfluorethylene modified by crystalline graphite. pp. 47--51
Summary: The investigations of structure and physical-mechanical properties of polymer composite based on polyfluorethylene with different content of ultradisperse crystalline graphite are presented. Influence of supermolecular structure parameters of polymer matrix on tribotechnic and mechanical properties of modified polyfluorethylene is shown. The results of research into the influence of friction upon polymer matrix structure are given.
Skaskevich A.A., Struk V.A., Ovclinnikov E.V., Kravchenko V.I.
Structure and triboengineering behavior of carbon saturated polyethylene. pp. 52--58
Summary: The structure and triboengineering behavior of polyethylene modified by clusters of synthetic carbon substance have been investigated. It has been established that major structural modifications in carbon saturated polyethylene occur in the amorphous portion of the polymer. Introduction of ultradispersed clusters of synthetic substance boost the energy of the process of thermoxidizing destruction modifying the supermolecular packing, making the fluctuation net of molecular bonds denser and promoting heat resistance of the polymer.
Padgurskas Yu., Rukuiza R., Gubanov V.A., Troichanskaya P.E.
The influence of fluoroligomeric materials on the operation conditions of precision and sealing friction pairs. pp. 59--66
Summary: It was established that the sealing of plunger pairs is re-gained and then increases 40 times, the volume of fuel supply per a cycle increases by 21.8 %. The fluoroligomeric coating may reduce the friction torque, which is 30-40 % below than that of pair without coating after 250 hour of operation. After 1500 hours of operation of the radial flange seals with velocity 3000 rpm, their wear decreases by 68 % and wear of the shaft decreases by 74 % against the reference pair. The microscopic analysis shows that specific structures with bulged on rubbing surfaces are formed.
Chupryk W.M.
Role of carbon in formation of exploitational surface layers of sliding pairs. pp. 67--72
Summary: An effect of carbon on the formation of rubbing surface layers on metallic surfaces are studied. The important role of carbon and oxygen in the formation of rubbing layers lubricated by mineral oil and sliding under conditions of oxidative wear was established. The amounts of carbon and oxygen on the sliding surfaces and in the layers lubricated was shown to differ for copper, bronzes and steel which is due to their different tendency to plastic deformation in the microvolumes of the friction contact.
Pinchuk V.G., Dey E.A.
Analysis of strength performances variations of metals surface stratum under friction. pp. 73--75
Summary: The analysis of strength performances variations of metals surface stratum defined by dislocation structure kinetic under friction is performed. Same specific features of dislocation structure are considered and connection on self--organization processes of surface stratum is discussed.
Pamfilov E.A., Pyrikov P.G.
The technological provision of machine parts and cutting tools wear resistance on the basis of complex methods of strengthening. pp. 76--81
Summary: The aspects of the technological provision of metallic surface wear resistance on the basis of mechanical and electrophysical ways of strengthening have been considered. The results of research of the parametric state of surfaces subjected to the strengthening influence of directed elastic deformation as well as by simultaneous influence of high energetic source have been listed in this report.
Gnyusov S.F., Tarasov S.Yu.
Phase transformations in hard alloy during friction and estimation of fractal characteristics of the friction surface. pp. 82--88
Summary: Results from tribotechnical testing of WC-Hadfield steel hard alloy pins rubbed against tool steel disk at normal load of 550 N and at sliding friction velocity in 0.65--2.8 m/s range are presented. Microstructure of surface layers after testing has been investigated. As is shown, phase composition and topology of friction surface are functions of the sliding speed value.
Antsiferov V.N., Smyshlyaeva T.V., Shatsov A.A.
Friction materials with metastable structures. pp. 89--95
Summary: The structure and the behavior of frictional asbestos-free materials produced by the powder metallurgy techniques are analyzed. It has been established that the materials with the metastable matrix possess superior wear resistance after deformation transforms austenite into martensite on the contact surface.
Chuprynin Yu.V.
Effect of change in friction coefficient of a friction clutch of tractors on pattern of transient processes in transmission. pp. 96--100
Summary: Dynamic model of friction clutch with smooth engagement is examined in an effort to study power drives by numerical methods. By way of example transmission operation is modeled at transient conditions with consideration of variation in the friction coefficient.
Frishberg I.V., Zolotukhina L.V., Kharlamov V.V., Zhidovinova S.V., Kishkoparov N.V., Dudko P.P., Kuzmin V.N.
Mechanism of influence of antiwear additive rimet upon he performance of cast iron- chrome friction couple. pp. 101--107
Summary: The effect of the Rimet antiwear additive in zink-containing motor oils upon the performance of cast iron- chrome friction couples is analyzed. It has been established that the additive reduces the wear rate of the specimens two times, zinc and copper deposit together on friction surfaces as solid solutions. The additive intensifies mass transfer of debris producing new wear resistant on friction surfaces consisting of finely dispersed debris bonded by copper.
ХРОНИКА
I.V.Kragelskii seminar on mechanics of frictions. p. 108
КАЛЕНДАРЬ КОНФЕРЕНЦИЙ. pp. 109--110
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Designed and maintained by Dr. Nikolai N. Kostyukovich. Last updated: October 6, 2000
Created with assistance of Dr. Ignatii I. Korsak
Copyright © 2000 The National Academy of Sciences of Belarus
Copyright © 2000 The V.A.Biely Institute of Mechanics of Metal-Polymer Systems
