Trenie i Iznos (Friction and Wear), 1998, Vol.19, No.2
/ Publications / Scientific Journals
Trenie i Iznos (Friction and Wear), 1998, Vol.19, No.2
Volume 19, Number 2; March--April, 1998
CONTENTS
ARTICLES
Yudin E.G.
Tribological scientific schools in N.Ye. Bauman Moscow State Technical University. pp. 149--154
Summary: A review is given of the tribological research and developments in MSTU since the beginning of this century. An emphasis is made on materials science, design and calculations of friction units and components.
Pronikov A. S.
Macrotribology and its problems. pp. 155--164
Summary: Problems and tasks of macrotribology are treated as a part of general tribology investigating modifications of parameters over the friction surface in the process of wear of a friction couple with ensuing changes in the performance of a relevant mechanical system.
Gekker F. R.
Generalized dynamic model of "dry" friction units. pp. 165--170
Summary: A generalized dynamic model of friction units is developed. The model takes into consideration elastic properties of materials and patchy contact of mating surfaces. Also, allowance for the preliminary displacement is included in the analysis.
Gekker F. R., Kalyagina N. V., Boitsov Yu. I.
Method for construction of multi-factor model of unsteady friction. pp. 171--175
Summary: A multi-factor model of friction coefficient is described. The model draws on the data from tests of unsteady sliding pairs made of carbon materials. The tests were carried out on the friction machine KO-58 under braking conditions. The data processing is based on the method of least squares.
Braun Ye. D., Petrova I. M., Moskvitin G. V.
Criteria of assessing durability of tribocouple members. pp. 176--181
Summary: Criteria are advanced to assess the durability of tribocouple members exposed to the effect of accumulating damage induced concurrently by low-, high-cycle loading and wear.
Gekker F. R., Zhurman A. R.
Motion of untightened nut against vibrating bolt. pp. 182--186
Summary: The study reported in this paper is undertaken to investigate motion of untightened nut against bolt whish executes axial harmonic vibration.
Bujanovskii I. A., Gurskii B. Ye.
Three stages of evolution of temperature flash in friction. pp. 187--193
Summary: An example of involute tooth gears is used to demonstrate that the three stages of the temperature flash correspond to the three stages of the seizure process evolution starting with the disintegration of the lubricating layer, origination and disappearance of adhesive bonds, and ending with seizure.
Shelofast V. V., Stainova E. G.
Statics and friction torque in imperfect spherical roller bearing. pp. 194--199
Summary: A contact problem is solved for imperfect spherical roller whose elements are made with errors. The load on rolling bodies and associated contact displacements are found from the balance equation. The roller is represented as a set of thin sections which are in individual contact with counterbody. Formulas are derived for displacements of the bearing center. The results is compared with that obtained by simulation of radial stiffness of the spherical bearing. Special-purpose software APM WinBear for the simulation enables the radial, lateral and axial run-out caused by production error to be calculated in hundred positions of the bearing.
Fedoseev V. N.
Triboengineering of friction couples of braking devices operating with repeated brief actuations. pp. 200--206
Summary: A method of comprehensive solution of the problem of rational engineering of type and dimension ranks of metal-to-plastic friction couples of braking devices operating with repeated brief actuations is disclosed. The physical simulation model of wear integrates the process of thermoelastic variations of the friction surface of the counterbody in a couple. The results of studies of the dynamics of origination of the contact contour area of the braking friction couple are demonstrated. The method of optimization of friction couples is based on a mathematical model employing a system of equations of thermal friction and wear dynamics and a LP-search algorithm.
Naidenov S. O.
Choosing the optimal friction torque in wheel brakes of airplane. pp. 207--212
Summary: A problem is examined on the optimal friction torque which provides least braking distance. The problem is solved with consideration for state of runway (wet, dry, rough) and the performance of tracking system. The numerical solution employs parameters of TU-154 airplane without regard for the lateral load on the wheels.
Utenkov V. M.
Development of applied software for simulating shape variations of sliding friction guide couples exposed to wear. pp. 213--217
Summary: The novel application software allows to simulate the processes of contact and wear of the guides of sliding friction couples with due account of the features of fabrication processes and the conditions of their operation. The simulation methods are based on the regularities of the statistical process of contact and the separation of an elementary volume of the material over actual contact sites in friction, together with the application of the algorithms simulating these processes. The software allows to predict well in advance variations of the parameters of precision of the movable member of a friction couple, including the most intricate multifaceted arrangements of guides, bearing systems of operating mechanisms exposed to random external effects upsetting the axial direction of responses along the edges of the guides.
Putintsev S. V., Shapovalov A. S., Anikin S. A., Belousov A. I.
Piston tribometer for comparative estimation of anti-frictional and wear-resistant properties of lubricants. pp. 218--223
Summary: A concept and design of piston tribometer i. e. device for measurement of local frictional force and wear in cylinder-piston assembly are given. An experimental procedure and some results of experiment with a number of motor oils and additives are presented.
Arzamasov B. N., Gromov V. I.
Promotion of wear resistance of titanium alloys by ion-plasma thermal treatment. pp. 224--226
Summary: Thermochemical ion treatment, such as ion nitrogentation and alpha particle implantation, is reported to be an effective tool of promoting wear resistance of titanium alloys. It is demonstrated that the phase composition is determined by the composition of the atmosphere in which a greater concentration of the saturating component intensifies generation of nitrides and oxides on the surface. Wear resistance of the alloys is determined by the surface phase composition, meanwhile nitride and oxide phases impair it. Ion nitrogenation has an advantage over alpha implantation particle because it creates a more stable saturation process. Nitrogenation is best achieved in the inert atmosphere of argon or helium being more effective in the latter.
Gerasirnov S. A., Velishchanskii A. V., Kucheryavy V. I., Gerasimova N. G.
Influence of structural factors on wear resistance of nitrided steels. pp. 227--230
Summary: The results are shown of structure investigation of nitrided layers on different steels as well as their wear resistance at lubricated friction. The wear was determined with the help of different laboratory tests. It was found that the maximum wear resistance all of investigated steels corresponds to structure of nitrided layer with the medium level of crystal lattice distortions of basic phase and with the uncoherent nitrides. The maximum hardness for all of investigated steels corresponds to structure of nitrided layers with the high level of crystal lattice distortions and with coherent nitrides.
Gerasimov S. A., Velishchanskii A. V., Gerasimova N. G.
Nature of high wear resistance of nitrided steels. pp. 231--234
Summary: The results of structure investigation of nitrided layers on steels as well as wear resistance are shown. It was found out that the maximum wear resistance for all investigated steels corresponds to high ability of deformation hardening.
Ryzhov N. M., Semenov M. Yu.
Wear resistance of carburized layer on alloyed steels with excessive carbide phase. pp. 235--240
Summary: The influence is studied of carbide phase on wear rate of the alloyed steel. The possibility is shown of wear resistance increase for carbirized steel under conditions of microcutting and adhesion of metal surfaces. The ambiguity is found of the carbide phase effect on contact endurance. Mathematical model is developed for prediction of chemical and phase composition of the carbirized alloyed steel as well as its wear resistance.
Yudin E. G., Vartanyan V. A., Vasiljeva E. A.
Improvement of quality and tribological characteristics of surface layers of transmission components by electrochemical polishing. pp. 241--246
Summary: The data are given on tests relating to the influence of electrochemical polishing on the surface layers and friction, wear, and scoring at heavy-duty contact. The article gives recommendations on selection of electrochemical polishing regimes.
Krokha V. A., Gekker F. R.
A technological method of detals abrasive wear resistance increase. pp. 247--253
Summary: The results of investigation of cold plastic deformation influence on e Abrasive wear resistance of metals, received by methods specially worked out, are given. A correlation between abrasive wear resistance of annealed metals and alloys and n strain hardening index is established. There is no one-way correlation between abrasive wear resistance and hardness -- it depends on metals nature, type and regime of its treatment, allowing receiving metals hardness of a specific level.
Utenkov V. M.
Problems practical macrotribology. pp. 254--259
Summary: An information is presented about the ways of improving the tribological calculation of accuracy reduction in material-working machinery due to wear of sliding guides. Main steps of prediction and simulation are discussed for initial profile of the guides, and static indeterminate form is valuated in calculatig the pressure in guides at complex desing arrangement of machinery.
Zyabrev A. A.
Processing provision of physical properties and service performance of electrical steels. pp. 260--264
Summary: Diffusion surface saturation with various elements is examined of components of electrical relay and devices made of electrical plain steels. An efficient method of circulation saturation with alloying elements from gaseous medium is proposed. This method allows one improve resistance to wear and corrosion while not impairing the magnetic characteristics of low-frequency magnet-soft electrical steels.
Gekker F. R., Kupreyanov A. A.
Triboengineering as a new discipline. pp. 265--268
Summary: Development of a new engineering discipline "Triboengineering" in Russia is considered and its tasks are formulated. It is mentioned that efficiency, reliability, and ecological effect of machines depend on efficiency of tribosystems, so it is necessary to educate the engineering staff. For this education the permanent workshop "Triboengineering" is established and Scientific and Methodological Council for discipline 071200, where the discussion on research and engineering problems proceeds, as well as formulation of training programs for a new discipline.
AUTHORS OF THE ISSUE
Professors of MGTI named after N. Ye. Bauman. pp. 269--271
HISTORY OF TRIBOLOGY
Khrushchov M. M. †
On the history of research in the field of automotive materials tribology, technology and materials science. pp. 272--279
Summary: The paper is devoted to the history of the Technological Department of Scientific Auto-Motor Research Institute (Scientific Automobile and Tractor Research Institute since 1931) where Prof. M.M. Khrushchov (1890--1972) has been Head in 1926--1940. At this Department first Soviet research works in tribology and materials science of antifriction and wear-resistant metallic materials for automotive industry have been performed.
MEN OF SCIENCE
Alexander S. Pronikov (To 75 years since Birthday). pp. 280--281
REVIEWS. p. 282
CONFERENCE CALENDAR. pp. 283--284
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Created with assistance of Dr. Ignatii I. Korsak
Copyright © 1998, 1999 The National Academy of Sciences of Belarus
Copyright © 1998 The V.A.Biely Institute of Mechanics of Metal-Polymer Systems
