Трение и износ, 1999, Vol.20, No.1
/ Издания академии / Научные журналы
Трение и износ, 1999, Vol.20, No.1
Том 20, номер 1; январь-февраль, 1999
СОДЕРЖАНИЕ
СТАТЬИ
Boldyrev Yu.Ya., Grigoriev B.S., Lupulyak S.V.
Computation of reversible gas bearing with maximum loading capacity. pp. 5--11
Summary: The symmetric one-dimensional gas bearing is considered. It can operate for two opposite directions of the motion. Calculus of variations is used to determine a shape of the lubricated film providing the maximum loading capacity. Parameters of the optimal bearings for various numbers of compressibility are calculated.
Drozdov Yu.N., Seock-Sam Kim
Tribological peculiarities of mechanical systems for operation in the open space. pp. 12--19
Summary: High significance of space research and influence on tribological characteristics: oxidizing medium absence, vacuum, sublimation, increased vaporability, heat density, zero gravity, different kinds of irradiation fields, micrometeorites and other factors, operational in the outer space are emphasized. With the performance duration increase and growth of weight and scaling characteristics, and also space programs value, importance of friction units reliability and resource problem increases.
Yemelyanov I.A.
Estimate of viscous forces principal moment in binary self-action gas bearing lubrication film. pp. 20--27
Summary: Calculation algorithm for viscous forces principal moment in grooved zone of self-action gas bearing with congruent spiral grooves of arbitrary depth on both fixed and moving walls of lubrication film is developed. It is proved, that more simple expression for friction moment both in binary and in partial bearings, which were received for special cases of common model, ensured the same accuracy as the universal algorithm did. It is found that binary bearing, ensuring more high load capacity and stiffness, had smaller friction moment in comparison with partial bearing.
Lazarev V.A., Maksimov I.L.
Dissipative instabilities and thermoelastic friction self-excited vibrations at sliding. pp. 28--36
Summary: A generalized model of thermofrictional contact was proposed which describes thermoelastic effects in the contact zone as well as a dependence of the friction coefficient on temperature and sliding velocity. Dissipative mechanisms responsible for different modes of sliding instability were revealed. Domains of sliding instability were determined in the space of the parameters which define the system response to the dissipative, mechanical, and thermoelastic disturbances. It was shown that the thermoelastic deformations in the contact zone may produce stabilizing or destabilizing action on time hystory of sliding depending on the system parameters. Oscillation regime was found for sliding velocity, temperature and pressure in the contact zone which corresponds to the stable limit cycle on the phase plane of the system.
Tzhos M.
Modelling of contact formation for solids under normal load. pp. 37--41
Summary: Contact of solids formed under external load is modeled. The simplified model of contact is proposed which includes mechanical and topographic characteristics of mating surfaces. The mathematical description of adhesion connections is proposed.
Voyachek A.I.
Criteria of ultimate conditions under the deformation of contact system consisting of two materials mated over arbitrary surface. pp. 42--47
Summary: Criteria of ultimate conditions of contact system under its simultaneous compression and shear has been developed. The system consist of two different uniform and isotropic materials. These materials come in contact over arbitrary surface along its thickness. All computations and the comparison of developed criteria with experimental data are given.
Gursky B. Ye.
About the modification of the Blok's model for the tribosystems of real dimensions. pp. 48--53
Summary: Usage of Block's model is found to be efficient in improving the durability of spur involute gears.
Komarovsky I.A., Zharov I.A., Zakharov S.M.
Scale effects at simulation of rolling with lateral slippage at dry friction. pp. 54--61
Summary: The approach to study scale effects is offered. The violation of conditions of a similarity of wear processes is revealed at resizing of rollers. Is shown, that at the same values of pressure and the relative slippage the different types of wear process can be observed depending on rolleis' size. The hypothesis is expressed that this violation of a similarity is due to test rig and rollers' vibration.
Chichinadze A.V., Polyakov N.V., Klyuchnikov V.I.
The necesity of consideration of screening action of the thin films for the temperature evaluation on the friction surface of solids. pp. 62--66
Summary: The present studies are the continuation of the works in the heat dynamic of friction. The approach is developed for consideration of the effective thermal-physical parameters of the surface layer. The limits of inadmissible temperatures on the friction surface and the temperature flash on the spots of contact are considered. Maximum possible temperatures are evaluated as frictions of heat pulses, thickness of surface films, roughness, parameters of contact materials and films
Tarasov V.V.
One of the identification features for tribosystems. pp. 67--73
Summary: Based on tribological analysis of various, engineering, processingand metrological systems, the peculiar feature of monitoring their parameters is formulated.
Klinskaya-Rudenskaya N.A., Kostogorov E.P., Kurylev M.V., Tskhai E.V.
Investigation of plasma coatings based on stellit with the refractory additives obtained by SPS. pp. 74--79
Summary: The results of research of new plasma coatings are represented. Such coating are recommended for components resistant to wear, high temperature, and mechanical loads.
Okhlopkova A.A, Sleptsova S.A.
Use of oxide and nitride ceramics for modification of polytetrafluoroethylene. pp. 80--85
Summary: The effect of the chemical nature and content of oxide and nitride ceramics on tribotechnical and physico-mechanical characteristics of the composites based on polytetrafluoroethylene is studied. The existence of critical concentrations of the fillers marking drastic and nonlinear changes of the composite properties is established. Values of critical concentrations for different types of ceramics depend on valent state of traditional metals composing the fillers.
Urbanovich L.I., Kramchenkov E.M.
Investigation of steel and alloy erosion under solid particle impact. pp. 86--90
Summary: Experiments have been performed in which titanium alloy BT-1, steel ШХ15, steel 40X2H2MA and stainless steel 12X18H10T were eroded by silica sand particles at the room temperature and normal impingement conditions. Two ranges of particle size were applied: 0.100...0.160 mm and 0.200...0.315 mm. It has been established that the steady state erosion rate is an exponential function of the impacting particle velocity ranging from 30 m/s to 110 m/s. The values of exponents for these materials vary from 2.13 (ШХ15 steel) to 2.27 (12X18H10T steel). It was found that the velocity exponent in the erosion prediction model for aluminum alloy D16T is equal to 2.04 at 293 К and it makes 2.49 at 136 К. The erosion rate of this material increases more than four times with temperature decreasing from 293 К to 120 К.
Kharchenkov V.S., Pogonyshev V.A., Lemeshko V.I.
Optimization of surface roughness betore the application of soft run-in films using the final antifriction nonabrasive treatment. pp. 91--94
Summary: It has been determined that the quality of coating obtained by the final antifriction nonabrasive treatment method depends on physical and mechanical properties of surface. Optimum surface roughness before the application of soft films for run-in has been determined theoretically.
Zharinov S.P.
Fluorine-containing surfactants for wear-resistant coatings and lubricants. pp. 95--102
Summary: Water- and oil-soluble perfluorsurfactants were tested under the conditions of boundary and prevailing fluid friction. Favourable concentrations of the perfluorsurfactants in water and petroleum oils were determined. The equations are deduced, reflecting the influence of the perfluorsurfactants concentation, contact pressure and bulk temperature of the lubricants on wear rate and friction coefficient of different metalls. The mechanisms are suggested of perfluorsurfactants action under boundary and fluid friction conditions. On the basis of the data obtained a new glycerine-based lubricant is developed for the bronze-steel friction pair, which includes aldehyde and perflouracid as special additives.
Golovchenko I.P., Melnikova E.P., Chumichev A.A.
Study of interrelation of the run-in and electrochemical phenomena appearing at friction. pp. 103--106
Summary: Run-in of steel 45 -- steel 40X pairs was studies in sodium silicate compounds. A relation between variation in the electrochemical potential of friction surfaces and the run-in rate was established for tribocontacts. The conclusion was made that the run-in duration can be controlled by variation in the electrochemical potential of the tribocontact.
Sorokin G.M.
Problems of material science and tribology in mechanical engineering. pp. 107--111
Summary: Current problems of mechanical engineering are discussed with the emphasis on increasing the strength and tribological performance of steels.
ХРОНИКА
I.V.Kragelskii seminar on mechanics of frictions. pp. 112--113
НОВЫЕ КНИГИ. p. 113
КАЛЕНДАРЬ КОНФЕРЕНЦИЙ. p. 114
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Designed and maintained by Dr. Nikolai N. Kostyukovich. Last updated: November 12, 1999
Created with assistance of Dr. Ignatii I. Korsak
Copyright © 1999 The National Academy of Sciences of Belarus
Copyright © 1999 The V.A.Biely Institute of Mechanics of Metal-Polymer Systems
