Трение и износ, 1996, Vol.17, No.6

Трение и износ, 1996, Vol.17, No.6

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

Том 17, номер 6; ноябрь-декабрь, 1996

СОДЕРЖАНИЕ

СТАТЬИ

Zharov I. A.
Friction and wear at movement of a rigid rough surface in direction parallel to a soft rough surface. pp. 715--718
Summary: The actual contact area, friction force and wear rate at the relative displacement of two rough surfaces are found. When determining wear rate formula for wear of a surface by moving convex indenter is used.

Kovalchyk Yu. I., Pashechko M. I.
Modelling of temperature fields in microprotrusion under friction. pp. 719--725
Summary: The temperature fields, arising during friction, have been modelled for the problems of the thermal conductivity with limited conditions of the second kind. The mathematical transformations which allow to present the problems solutions in analytical form in terms of Wiener integrals have been proposed. The application of these models to calculation of the maximum temperature on the contact spot surface has been shown.

Yevtushenko A. A., Kulchytsky-Zhyhailo R. D.
Temperature of the frictional hot spot, moving along the thermalsensible carbon graphite basis. pp. 726--732
Summary: An iterative method is to determine the quasi-stationary temperature field, associated with frictional hot spot, moving on the half-space surface is proposed. It is assumed essential temperature dependence of the thermal properties (thermal conductivity and specific heat). Presented are dependences of the contact temperature on the Peclet number and heat flow distribution for the carbon graphite half-space material.

Dzhilavdary I. Z., Rusak A. A.
The direct estimation of a friction force in the method of the damped pendulum oscillations. pp. 733--737.
Summary: The traditional most sensitive test method for the friction coefficients estimation by the measuring the amplitudes of free decaying pendulum oscillations fails to determine the real force-velocity relation. The new method for the direct estimation of the pendulum friction force is offered. This method may be much more simple and accurate than the first one. Also the new simple and rather accurate method for estimation of the period of frictionless oscillations of a damped pendulum is offered. The both methods may be carried out during one-two oscillation cycles. The experimental results are described. They prove the reality of this methods. Some of this results conflict with the traditional oscillation theory deductions.

Mozharovskii V. V., Smotrenko I. V.
Mathematical modelling of interaction between a cylinder and fibrous composite material. pp. 738--746
Summary: Investigations have been carried out in the area of tribosystem calculations based on fibrous composite materials. Mathematical dependences have been obtained to describe contact interactions in the joint containing parts made of a fibrous composite material.

Zernin M. V.
Discrete simulation of failure in sliding bearings with account of external effects and failure criteria. Paper 1. General scheme of life calculation. pp. 747--755
Summary: Technique of life calculation for sliding bearings is presented. It is based on discretization of the failure accumulation. Various models are used for different stages of failure accumulation. Models and performances are grouped in databases.

Bitkov V. V., Zalazinskii A. G., Kolmogorov V. L.
A tool parameter analysis for wire drawing under conditions of plasto-hydrodynamic friction. pp. 756--763
Summary: The results of the theoretical study of lubricant powder rheology for drawing are presented. A design of the composite tool for rod and wire drawing under conditions of plasto-hydrodynamic friction is described. By methods of mathematical simulation optimum parameters of the tool are determined.

Potekha V. L., Rogatchev A. V., Napreev I. S.
Theoretical and experimental evaluation of optimum conditions in epilamated friction units. pp. 764--768
Summary: The experimental results evidence to a high effectiveness of the epilamen treatment in increasing wear resistance of tribomechanical systems. Investigations in this field should be conducted with the purpose of improving and obtaining more precise mathematical model that describe the kinetics of the epilamen film wear.

Shestakov V. M., Ryabinin V. A., Revyako M. M., Gorshcharik N. D.
The energy method of life prediction for metal--polymer tribosystem. pp. 769--772
Summary: Life prediction of metal--polymer tribosystem with thermoset component is presented.

Vagidov M. A., Dzhanakhmedov A. Kh.
Optimization of hoist operation at removing a string from well with friction. pp. 773--781
Summary: Problem of optimization of hoist-string-well system with its tribological parameters is solved. The principles of optimization are generalized to example of vertical well without the force of friction, which then were distributed to process of removing the string with friction. Rod effort in the case of removing the string from well with friction is considered. The number of problems connected with the friction of flexible thread to curue lined profile is met in the oil industry, for examle in research of liffing and dropping operations, friction and wear of pipes and others. Given mathematical model has a great practical significance.

Ershov B. I., Andrianov D. N.
Evaluation of liquid viscosity in calculations of hydraulic piston distributor. pp. 782--786
Summary: The paper deals with the problems of improvement of the piston distributor in axial hydraulic machines. Some engineering recommendations for improvement of this units to increase their service life are given after the comparison of calculations and experimental data.

Nazarov A. D.
Theoretical basics of calculation of optimum assembling clearance between compression ring and bottom of groove of piston of engines. pp. 787--798
Summary: One of the reasons of decreasing the reliability and deterioration of vibration and acoustic performance of engines is inadequate clearance between compression ring and bottom of piston groove. This decreases quality of grinding, causes scratching, increases speed of wearing the working parts of cylinder and the ring. This also increases vibration and noise of engines. In this work equation is derived for calculating necessary and real clearance in system "compression ring--groove". Also, conditions for calculation of optimum assembling clearances in this system during producing and repairing of engines are shown as well.

Krasnov A. P., Afonicheva O. V., Mit V. A., Golub A. S., Shumilova I. B., Novikov Yu. N.
Thermofrictional properties of molybdenum disulfide intercalated by heterocyclic compounds. pp. 799--801
Summary: The decrease of the coefficient of friction of intercalation compounds of MoS₂ with 1,10-phenantroline (phen)_0,1 MoS₂, (phen)_0,3MoS₂, and 2,2'-bipyridyl (bipy)_0,2MoS₂ was observed when the temperature are close to the melting point of intercalant. In the case of (phen)_0,3MoS₂ this results in exeptionally low friction (f ~ 0.02) at 100--200 °C. The great thermofrictional stability of IC-1 (up to 320 °C) and IC-2 (290 °C) was found. The influence of an orientation of guest molecules on the frictional properties of intercalation compounds is discussed.

Chashechkina Zh. Yu., Orlov D. B.
Antifriction aluminum-lead alloys for sliding bearings. pp. 802--809
Summary: With the aim of designing new antifriction materials having high operating characteristics we have studied the structure and properties of Al--Pb alloys by a magnetohydrodynamic method. The properties of the Al--Pb alloys were compared with those of commercial materials by examining aluminum- and tin-based alloys, namely, AO20-1 and AO6-1. It has been found that the experimental alloys on the base of aluminum and lead possess, under optimal electromagnetic processing regimes, a homogeneous fine-disperse structure. They have been shown to have good mechanical properties. Their antifriction characteristics exceed the corresponding characteristics of commercial alloys. Recommendations are given for the use of Al--Pb alloys as promising materials for sliding bearings.

Corban V. F.
Investigation of structural transformations in sprayed chromium coatings at friction. pp. 810--815
Summary: Mechanisms of interactions taking place under friction of the sprayed surface with a counter-body have been analyzed, its consequences have been studied. Structure and phase composition were studied before and after friction. The appearance of chromium nitride was registered parallel with the increase of oxygen concentration in the surface layers of chromium coatings. The friction character has been studied and a scheme of the processes accompanying the wear has been suggested.

Lebedev M. P., Vinokurov G. G., Bolotina N. P.
Wear peculiarities of plasma coatings based on self-fluxing alloys. pp. 816--822
Summary: The results of research in wear of catings based on Ni--Cr--B--Si system self-fluxing alloys are presented. The calculation of semi-endless body heat. by travelling normally-circular heater at several passes was used. The wear mechanism of fused plasma spray covers has been investigated. The wear-resistance was compared with the data on steel at high contact loads.

Kovtun V. A., Shuvalov V. B., Galov S. V.
Triboengineering characteristics of frictional materials based on a thermosetting binder. pp. 823--826
Summary: Triboengineering characteristics of frictional materials based on the reprocessed worn--out frictional units have been investigated. The materials are shown to possess improved tribological characteristics and retained physico-mechanical properties under high temperatures as compared to batch--produced ones.

Vorobyova S. A., Lavrinovich E. A., Mushinskii V. V., Lesnikovich A. I.
The influence of the highly dispersed additives on the antifriction and antiwear properties of the motor oil. pp. 827--831
Summary: The influence of the highly dispersed metals and copper oxide on the antifriction and antiwear properties of the motor oil have been investigated. In agreement with the experimental results, the additives of the highly dispersed nickel and copper which were synthesized by the chemical deposition are improved the antifriction and antiwear properties of the motor oil.

ЛЮДИ НАУКИ

Rostislav M. Matveevskii (To 80th anniversary). pp. 832--833.

ХРОНИКА

News of the International Tribology Council. pp. 834--835.

КАЛЕНДАРЬ КОНФЕРЕНЦИЙ. pp. 836--837.

Contents of Volume 17 (January--December 1996). pp. 838--841.

Authors index of Volume 17, No. 1--6. p. 842

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