Трение и износ, 1996, Vol.17, No.1

Трение и износ, 1996, Vol.17, No.1

ТРЕНИЕ И ИЗНОС
Международный научный журнал
Published by INFOTRIBO Ltd., Gomel, Belarus

Том 17, номер 1; январь-февраль, 1996

СОДЕРЖАНИЕ

СТАТЬИ

Aero E. L., Bessonov N. M., Bulygin A. N.
Interlaminar friction and boundary lubrication in anisotropic liquids with rotational degrees of freedom. pp. 5--11
Summary: The influence of anisotropy of surface lubricant layers on friction at boundary lubrication is analyzed. Normal stresses are produced in shear flow if there are oriented particles in it. Corresponding Coulomb term appears in friction law at boundary lubrication along with Newtonian one. The effect depends on alignement of anisotropic axes to boundary surface.

Bogdanov V. M., Goryachev A. P., Goryacheva I. G., Dobychin M. N., Zakharov S. M., Krivonogov V. G., Soldatenkov I. A., Chekina O. G.
A study of wheel -- rail contact, wear and cumulative damage. pp. 12--26
Summary: An excessive wear and damage of rails and wheels are a great problem for heavy haul railways. This paper presents model for evaluating the tribological aspects of wheel/rail curve interaction. The aim is to obtain the shape, size and the position of the contact areas, the contact stresses, wear rate of rail head and wheel profile, the areas of the potential fatigue damage. Such input data as wheel/rail interaction forces and angle of wheel attack are considered as random variables and are obtained from the dynamic model of track and rolling stock interaction. The results of the evolution of rail arid wheel profiles indicate that there is reasonable agreement with their actual wear in curves. The developed model is going to be used for study an influence of principle factors on wear and damage of rail/wheel system.

Evtushenko A. A., Ivanik E. G.
Transient temperature of local spots at sliding friction. pp. 27--34
Summary: The algorithm of numerical investigation to analyse heat processes in local region of the frictional sliding of semi-infinite body is proposed. The influence of the circular heat source on the temperature distribution resulting from friction is investigated.

Balakin V. A.
Estimating the friction characteristics of sports luges and bobs sliding along ice track. pp. 35--42
Summary: Method to determine friction forces at sliding luge and bob on the ice track is examined.

Bereznyakov A. I.
Wear rate equation for tribojoint with existence of the contamination particles in lubricant. pp. 43--49
Summary: On the basis of the interaction model of the charged contamination particles with the tribojoint surface and with help of Prigogine's theorem the equation for wear rate was obtained. This equation is connecting the wear rate with tribotechnical parameters of the tribojoint. In particular, the wear rate is minimal at the charged particle dimension which is equal to the Debye length.

Bufeev V. A.
Action of three-dimensional system of active forces on friction (phenomenon of supercoulomb external friction). pp. 50--57
Summary: Action of three-dimensional system of active forces on external friction has been investigated. The data obtained extend modem knowledge about the friction mechanism.

Kwon O. K.
Spherical particles formation in lubricated sliding contact. pp. 58--66
Summary: The mechanism of various spherical particles formation from wide range of tribosystems is suggested and deduced by the action of micro-explosion on the basis of the thermally-activated wear theory, in which the flash temperature at contact could be reached clearly up to the material molten temperature due to the secondary activation energy from the exothermic reactions involving lubricant thermo-decomposition, metals oxidation, hydrogen reactions and other possible complex thermo-reactions at the contacts. Various shapes of spherical particles generated from the tribosystem can be explained by the action of micro-explosion accompanied with the complex thermo-chemical reactions at the contact surfaces or sub-surfaces.

Suslov A. A., Ermakov S. F., Chizhik S. A., Kupchinov B. I.
The effect of the liquid crystalline additive on microrelief of steel wear surface. pp. 67--73
Summary: Comparative microrelief investigations of friction surfaces lubricated with plane oils and that with additives were conducted. With the help of atomic force microscope, it was established that introduction of liquid crystals or molybdenum disulfide dispersion into the lubricant results in formation of smoothed microreliefs of similar character. Low friction coefficient and wear, high load capacity of tribojunction and also formation of smaller microasperities when the liquid crystalline additive is used makes it more effective as compared with other lubricating media.

Tikhomirov V. P., Gorlenko O. A.
Simulation of rough surface contact. pp. 74--79
Summary: Contact model of solids with rough surfaces is considered. The structure of a surface is described by the Weierstrass – Mandelbrot function. Approach of rough surfaces is estimated. The result of the computer simulation agrees well with experimental data.

Fricke R. W., Allen C.
An apparatus for repetitive impact wear testing. pp. 80--84
Summary: A laboratory apparatus has built capable of simulating the repetitive impact wear experienced by poppel valves in aqueous environments. It is capable of producing impacts whose energies and velocities lie between 1 -- 5 J and 4 -- 10 ms^-1 respectively in the frequency range 5 -- 50 Hz. A variety of profiles e.g. line contact, flat-on-flat or spherical-on-flat can be tested allowing the study of many applications involving repetitive impact wear.

Fuks-Rabinovich G. S., Kovalev A. I.
Features of blanking die wear when taking account of variation in composition, structure and properties of contact surfaces. pp. 85--93
Summary: Studies have been carried out of wearing the blanking dies made of chromium steels. Structural changes were examined in the surface layer of die at wearing.

Gromakovskii D. G., Logvinov L. M., Otrazhii V. I.
Investigation of wear particle parameters formed at friction. pp. 94--99
Summary: In the article study results of wear particles parameters performed with a new apparatus are shown. It is demonstrated, that detectors permit the definition of a rate and type of wearing, and the estimation of influence of materials, lubricants, additives and other factors on wear.

Krasnov A. P., Chernyavskii A. I., Chernyavskaya N. A.
The effect of modification by oligoorganosilane on triboengineering properties of aliphatic polyamides. pp. 100--104
Summary: Triboengineering properties of polyamide 66 (including fiberglass reinforced polyamide) modified by reactive oligoorganosilane have been investigated. It has been found that the change of character and the reduction of intensity of tribochemical processes in the surface layer of modified polyamide leads to the improvement of the material triboengineering properties.

Burya A. I, Prikhodiko O. G., Kholodilov O. V., Burya A. A.
Effect of solid lamellar lubricants on tribotechnical characteristics of composites based on aromatic polyamide. pp. 105--112
Summary: The effect of solid lamellar lubricants (graphite, molibdenum disulfide, boron nitride, PTFE) and the service conditions on friction and wear of the composites based on aromatic polyamides -- phenilone-П and -C is studied. The optimum content of filler ensuring adequately high mechanical properties studied is found to range from 10 to 25%mass. The best set of characteristics displays the graphite-filled composite, showing a 35 -- 60 times lower wear rate and a double reduction of friction force.

Kuzharov A. S., Marchak R., Guzik J., Kravchik K., Zadoschenko E. G.
Research of the phenomena of the tribological self-organisation in the "brass -- glycerine -- steel" system. pp. 113--122
Summary: Tribological properties of system "brass -- glycerine -- steel", working in the regime of the "wearless" effect are compared with behaviors of systems under the boundary lubrication. Oscillatory character of tribological properties at the "wearless" effect confirmed the self-organisation in the system and may be specter of identification of this effect. Details of the experimental research are presented in the paper.

Belenkykh E. V.
Lubricating film vitrification at heavily loaded contact on a disk friction machine. pp. 123--127
Summary: Necessary observation conditions of liquid lubrication vitrifying effect are considered along the sliding curves of the disk machine. Special methods have been developed allowing to determine the vitrifying pressure value of the lubrication tested along the experimental sliding curves obtained for various pressure values according to Hertz in the contact area. It is found that the thin film lubrication has much less vitrifying pressure (2 -- 3) times as little) than the volumetric lubrication has.

Alekseev V. I., Suslin A. V.
Improvement of lead-carrying capacity and longevity of high-speed gearing. pp. 128--130
Summary: A number of methods to increase the loading capability and durability of aviation toothed gearings are considered. The use of transvers contact ratios higher than 2 in spur gears and conical upright-toothed gears as well as the use of improved manufacturing process of gear cutting and lubrication enabled the development of reducers with a lower level of vibration and dynamic load of toothed gearings.

Prushak V. Ya.
Study of triboengineering characteristics of composite materials based on epoxy resins modified by inorganic fillers. pp. 131--135
Summary: It was shown that a string of Epoxy resins' properties allows its use as polymer matrix for wear-resistant composite materials operating in friction assemblies. To increase their wear resistance, modification of polymer matrix by amorphous inorganic binders was studied. Triboengineering characteristics of polymer-ceramic compositions were investigated. Using computer experiment planning it was established that filling of Epoxy matrixes with mineral structural binders results in lowering wear rate at rubbing in abrasive-oil medium.

ЛЮДИ НАУКИ

Yuri N. Drozdov (To 60th anniversary). pp. 136--137

ХРОНИКА

The 10th international colloquium ''Tribology -- solving friction and wear problems". pp. 138--139

Session of International Tribological Council. pp. 139--140

First session of International Association of Academies of Science (IAAS) scientific council. pp. 140--141

ОБЗОРЫ

Fundamentals of Tribology / Ed. by A. V. Chichinadze, Moscow, 1995. pp. 142--144

КАЛЕНДАРЬ КОНФЕРЕНЦИЙ. pp. 145--146

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