Трение и износ, 2000, Vol.21, No.3
/ Издания академии / Научные журналы
Трение и износ, 2000, Vol.21, No.3
Том 21, номер 3; май-июнь, 2000
СОДЕРЖАНИЕ
СТАТЬИ
Popov V.L.
Phonon and electron shares in the force of friction between crystalline solids at cryogenic temperatures. pp. 229--237
Summary: Recent experimental and theoretical studies have manifested that there is no force of fiction in an "atomically intimate" contact between two crystalline bodies at rest providing they possess comparable periods of their crystalline lattices and interactions at the interface stay below a certain critical value. In this case the emission of phonons and excitation of conductivity electrons are the only mechanisms of friction. The present study demonstrates that phonons may contribute very little, if at all, to friction at cryogenic temperatures due to the quantum mechanical nature of elementary excitations in a solid. Hence, incomparable dielectric crystals may slide at such temperatures
practically without friction. Excitation of electrons of conductivity in metals induces a finite dynamic force of friction at any possible low temperature. The present paper shows theoretical assessments of the shares of both phonons and electrons in the force of friction of a metal in both normal and superconductive states.
Kulchitsky-Zhigailo R.D.
Stress distribution in axi-symmetric contact problems with heat generation. pp. 238--245
Summary: Axi-symmetric contact problems with heat generation have been considered in [1-5]. Thermal deformation of surfaces of contacting bodies was found to have a significat influence on solution of contact problems. The main idea rests on application of the algorithm presented in [6] to derive approximate formulas for the contact area and the distribution of the contact pressure. The calculated error of the radius of contact area is about 3% when compored the well-known solution [1, 2, 5]. The derived formulas were applied to evaluate stress distributions within contacting bodies.
Tikhomirov V.P., Shalimov P.Yu.
Neuronet models in tribology. pp. 246--251
Summary: Principles of computer technology based on artificial neuron nets are discussed. The potential of application of neuronet models for tribological studies is demonstrated.
Bufeev V.A.
Mechanical friction effect. pp. 252--257
Summary: The paper discusses the physical content of the scientific postulate according to which all the components of the tensor of stresses (all the components of forces) affecting rubbing bodies induce friction due to the deformation of the bodies. This postulate makes up the essence of the new mechanical friction effect first discovered in clayey soils.
Unchung Cho
A Proposed phenomenological approach to wear debris analysis. pp. 258--263
Summary: In this paper, the concept of wear debris phenomena is proposed to facilitate the determination of wear mechanisms from the appearance and type of debris. Two terms are defined to describe phenomena which can occur on wear debris. An extended classification of wear is made to accommodate wear debris phenomena.
Bereznyakov А.I.
Relationship between triboengineering processes and the features of propagation of surface stownly waves in the absorbing environment. pp. 264--268
Summary: The model of propagation of surface Stownly waves in friction units and consideration of their absorption have yielded the relationship between the force of friction and triboengineering parameters. It is demonstrated that the force of friction reduces as the speed augments and that it depends almost linearly on the contour pressure and roughness. The surface layer in which Stownly waves propagate reduces friction.
Galay E.I., Balakin V.A.
Calculation of temperature rise in the railway wheel rim in braking. pp. 269--275
Summary: An engineering method of calculating the mean temperature on the rolling surface of the wheel has been analyzed when the railway train is braked in emergency. Examples of temperature calculations are shown in which the original data have been borrowed from full-scale tests of shoe brakes and the thickness of the wheel rim corresponds to that of the new and worn wheels.
Zharov I.A.
Mutual wear of the wheel-rail couple at specified loads and running angle. pp. 276--284
Summary: Models of mutual wear of wheels and rails and the criteria of optimizing the shapes of their profiles are proposed. Optimum conforming profiles of wheels and rails have been determined. Promising trends of improving the models are outlined.
Sergienko V.P., Tkachev V.M., Stolyarov А.I., Zhuk V.V.
Numeric simulation of stress state of brake disk. part 1. Effect of design and technological fabrication conditions. pp. 285--290
Summary: It is shown how to calculate the stressed state of disk brakes with asbestos-free friction linings using the method of finite elements. The effect of the design of the metallic base on the stress-strain state of the friction linings has been assessed. The fields of distribution of streses, deformations and temperatures in real brking systems have been calculated. The calculations have served to elaborate guides how to modify the design of brake disks in order to reduce internal residual stresses in the friction material.
Semenova T.V., Korochkina T.V., Meshkov V.V.
Study of the friction effect on the stress-strain condition of the pump radial piston. pp. 291--294
Summary: The method of finite elements has yielded the distribution of stresses in the piston with the account of variations of friction forces in the friction contact zone during transition from stable operation of a high precision "piston - bushing" couple to extreme conditions of operation. The most vulnerable regions of high stresses have been identified. It is demonstrated that normal and tangent stresses are essential factors for assessing the performance of the piston and should be taken into consideration in order to optimize its design.
Rymuza Z., Mistyak M., Kuhsnerevich Z., Shmidt-Shalowski K., Rzanek-Boroch Z.
Testing wear of ultrathin films. pp. 295--302
Summary: Methods of testing wear of ultrathin (below 300 nm thick) films applicable in Micro Electro Mechanical Systems (MEMS) microdevices and magnetic recording technology are discussed. Results of the tests conducted using Atomic Force Microscope (AFM) and special microtribometer on the wear behavior of ultrathin, self-lubricating silicon dioxide and silicon nitride films containing organic substances inside and manufactured by glow discharge technique at atmospheric pressure and low temperatures are presented.
Antsiferov V.N., Sevastyanova I.G.
Fragile failure and wearing of Y-TZP-Al2O3 ceramics. pp. 303--306
Summary: The features of fragile failure and wearing of Y-TZP-Al2O3 ceramics are studied at friction in contact to steel, copper, titanium at different boundary conditions. The behavior of contingency ceramics--steel in conditions of dry friction is controlled by evolution of layer enriched with oxide of metal. The formation of lubricating and oxide films in pair ceramics--copper at restricted supply of lubrication promotes reduction of shift strength of friction connection. The mechanism of wearing of pair ceramics--titanium in conditions of boundary friction is determined by adhesive interaction. The deformations, induced by external loading, originate in ceramics partial transition of tetragonal ZrO2 in a monoclinic phase.
Mashkov Yu.K., Poleshchenko K.N., Remnev G.E., Kalistratova N.P., Povoroznyuk S.N., Vershinin G.A.
Effect of radiation-heat treament on wear resistance of hard alloys. pp. 307--312
Summary: The effect of radiation -- heat treatment with powerful ion beams on the wear resistance of hard alloys has been studied. The obtained data about the structural and phase state and the mechanophysical characteristics have been analyzed in order to determine the causes why modified high-speed materials promote wear resistance in cutting.
Dmitrichenko N.F., Milanenko A.A., Mnatsakanov R.G., Danilyuk S.
Empirical solution of the isothermal elastohydrodynamic problem for an abundantly lubricated pin-pointed friction contact. pp. 313--317
Summary: Optical interferometry has served to measure the thickness of an elastohydrodynamic oil film in an abundantly lubricated pinpointed friction contact. The obtained experimental results have been applied to the studies of the effect of dimensionless parameters of speed, load and materials upon the dimensionless thickness of the film in the center of the contact. Also, a differential approach is advanced suitable to determine the film thickness based on the rheological attribute. To derive the formulas for the film thickness in the contact center, 19 various combinations of parameters of three groups of lubricating materials have been used. The theoretical results for the film thickness feature the specifics of the earlier reported experimental results which other researchers achieved using optical interferometry.
Arustamyan Yu.S., Pogosyan A.K., Saroyan V.V., Gevorkyan G.R.
Study of chemical organic compositions of various classes as a additives. pp. 318--322
Summary: Anti-wear and anti-scoring properties of various classes of chemical organic compositions, used as poly-componental additives to lubricating oils, are experimentally studied and resumed. For an each class of compositions mechanisms of additives action are described and their specific peculiarities are given. The mechanism of chemical modification of the friction surfaces in conditions of application of these compositions as additives is caused by the presence of cyclic fragments in the additive molecules and halogen atoms activity located both in the cycle and aliphatic fragments of additive molecule in various ratios.
Kenko V.M., Stepankin I.N.
Effect of microstructure of steel P65M on the wear resistance of die cold upsetting tooling. pp. 323--328
Summary: The effect of the microstructural parameters, such as carbide non-homogeneity and dimensions of steel P65M grains, on the pattern of variations of the wear resistance of cold upsetting tooling has been studied. It is shown that matrices tempered to the 11th point grain are most wear resistant. Cementation of working surfaces can increase the wear resistance of workpieces and tools in contact friction.
Pamfilov E.A., Pyrikov P.G.
The technological provision of machine parts and cutting tools wearresistance on the basis of strengthening. pp. 329--332
Summary: The technological aspects of wearresistance control of metallic surfaces on the basis of magnitostrictional effect in metals, at the cost of structuring (anisotropic) layers formation in combination of the external induced magnetic field and the source effect with local concentration of energy have been considered in this report.
Krasnov A.Р., Afonicheva O.V., Studnev Yu.N., Andryushin V.M., Mit V.A., Volkov I.O., Komornitskii-Kuznetsov V.K., Kupriyanovich O.B., Paskhina T.I., Yurovskii V.S.
Friction of rubbers containing organic fluoromodifier. pp. 333--336
Summary: Friction and wear of ethyelenpropylene and butadien-acryl-nitryl rubbers have been studied under soft conditions (psp=0.05 MPa; n = 0.25 m/s) and as seals on a special stand under loads up to 550 g/cm, n = 10 m/s) and at temperature 250 °C. It is shown that introduction of the organic fluoromodifier into the rubbers strongly improves their wear resistance and thermofrictional characteristics. The causes of this behavior are analyzed relating to the modification of the surfaces of rubber specimens and migration of the fluorine containing modifier towards the friction surface.
ЛЮДИ НАУКИ
Fedor R. Gekker (70 years since birthday). p. 337
ХРОНИКА
Symposium "Slavyantribo-5" in Saint-Petersburg. pp. 338--339
ОБЗОРЫ. pp. 339--340
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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
