International Scientific Journal
Published by The V.A.Biely Institute of Mechanics of Metal-Polymer Systems, Gomel, Belarus
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FRICTION AND WEAR (Trenie i Iznos) International Scientific Journal Published by The V.A.Biely Institute of Mechanics of Metal-Polymer Systems, Gomel, Belarus |
Summary: A method is proposed how to estimate the service life of a cylindrical straight tooth gear. The calculation model makes allowance for pressure variations along the area of contact of teeth following the ellipse law providing the worn surface profile changes smoothly, as a result the evolvent radius in the calculated point of the profile and the curvature radius of the tooth surface have little difference. Con-sideration of these factors enables to verify the calculated service life of the tooth gear.
Gadzhiev G.Kh.
Minimumization of abrasive wear of internal surface of split cylinder of contact pair. pp. 242--247.
Summary: Using a rough friction surface simulation a theoretical analysis has been performed to determine the microgeometry of the internal surface of the split cylinder of a contact pair that ensures minimum abrasive wear of a friction unit.
Zharov LA.
Calculation of temperatures in the spot of contact between the wheel and rail during skidding and slipping. pp. 248--259.
Summary: Equation for temperatures in the moving contact spot are recorded in the dimensionless form. Dependencies are obtained for stabilized mean temperatures and the time of their stabilization as a function of the speed of motion starting with the zero speed. Functions of approximation for these dependencies are obtained. Formulas are derived for the coefficients of distribution of stabilized heat fluxes during rolling with sliding for all speed ranges. Dependencies of temperatures in the contact spot on time have been determined.
Starostin N.P., Kondakov A.A.
Calculation of non-stationary temperature field in disk-block friction pair at smaller engagement coefficients. pp. 260--265.
Summary: A problem is analyzed how to determine non-stationary temperature field in the disk--block system at high sliding speeds and small engagement coefficients. The problem is solved by the method of finite differences. The results of the analysis of non-stationary field in the cutting disk--diamond system are shown.
Podgaevskii O.L., Zhuzhzhalkin G.V.
Wear of active surfaces of flat cylindrical gear with the consideration of the parameters of engagement. pp. 266--278.
Summary: Problems are solved how to determine basic values of variables of curvatures of mutually running surfaces of a flat cylindrical gear, tangent velocities of points in respect to mated surfaces and sliding velocities in the calculated points of mutually running surfaces. Solution of the problems enables to make allowance for the parameters of mating of profiles, i.e. the location of contact sites on the contacting surfaces in response to the angle of rotation of a mechanism. The obtained parameters of the curvature, tangent velocities and sliding velocity of mutually running surfaces are necessary to determine the friction coefficient that governs wear of contacting surfaces as well as to solve the contact problem of the theory of elasticity during static compression of these elastic bodies, to select the optimal contact and to determine the fun of clearance between contacting surfaces of teeth.
Burya A.I., Kozlov G.V.
Structural aspects of friction and wear of phenylon-based carbon plastics. pp. 279--283.
Summary: It is shown that a cluster model and a fractal analysis can be successfully used to describe processes of friction and wear of polymeric materials. The non-linearity of temperature rise in the contact zone is determined by the fractal structure pf the polymeric matrix. A loosely packed matrix is the main structural component of carbon plastics responsible for the processes of friction and wear.
Drozdov Yu.N.
Non-linear dynamics of wear and debris. pp. 284--288.
Summary: Non-linear dynamic wear processes are typical for the period of running-in, catastrophic wear of many types of tribocouples. The non-linear wear dynamics relates to the chemophysical, mechanical contact processes that may change their condition in time discretely or continuously. The non-linear theory of dynamic systems uses non-linear dynamic models.
Kirilenko V.P., Zaitsev A.L.
Study of triboengineering characteristics of polymeric materials during friction in water. pp. 289--294.
Summary: Friction properties of thermoplastic and thermoreactive polymers (LPPE, PVB, PP, SFD, PA, PETF, EDMA, FFP) have been studied during friction in water on high-chrome steel. Their triboengineering characteristics are assessed at loads and speeds corresponding to the conditions of operation of water pumps. It is assessed how temperature influences the effectiveness of lubricating action of water. Optimum ranges of working temperatures and loads are determined that lead to the minimum friction coefficient. It is shown that PVB has the best triboengineering characteristics at loads £ 0.1 MPa, while FFP has them at higher loads. It is established that corrosive wear of steel depends on the chemical structure of polymer.
Okhlopkova A.A., Petrova P.N., Krasnov A.P., Afonicheva O.V., and Popov S.N.
Temperature dependencies of triboengineering parameters of composites based on PTFE and natural zeolites. pp. 295--300.
Summary: Results of triboengineering studies of composites based on PTFE and zeolites are discussed in relation to the nature and concentration of the filler and temperature in operation. Regularities are shown with which the topography of surfaces of friction and wear of metal-polymeric friction pairs appear.
Makarov A.V., Korshunov L.G.
Improving hardness and wear resistance of laser hardened steel surfaces using friction treatment. pp. 301--306.
Summary: The study relates to deformation hardening, resistance to softening during heating and wear resistance during abrasion and dry sliding friction of high-carbon and low-alloyed steels after laser hardening and additional surface plastic deformation with a hard-alloy indentor. It is shown that friction treatment with the sliding indentor improves significantly strength and tribological properties of laser hardened steels.
Zakharov S.M.
L.I. Bershadkii and his structural dynamic theory of tribosystems. pp. 307--312.
Summary: Works relating to the structural dynamic theory of tribosystems advanced by L.I. Bershadskii are briefly reviewed. In particular, the evolution of system of notions and classifications, new approaches to studies of tribosystems, new experimental methods, self-organization of tribosystems, diagram representation of tribosystems, structural dynamic description of tribosystems, some results and their practical implementation, are considered.
Buyanovskii LA.
Application of the kinetic approach to description of the process of boundary lubrication. pp. 313--322.
Summary: Some kinetic models of boundary lubrication are analyzed and their effectiveness is demonstrated when analyzing the process of friction during boundary lubrication. It is shown that they can be used for designing tribocouples with simple workbench experiments. Further development of these models is predicted.
Evelson L.I.
Some methods of analyzing tribological information. pp. 323--328.
Summary: Some aspects of analyzing and accumulating tribological information are outlined in order to create CAD of tribosystems. The advanced methods can be treated as further development of the idea of L.I. Bershadskii about SDT-diagrams. The basis are regression and fuzzy multiple models. Solutions of a number of particular problems are considered for comparison of mathematical models and how to use them to identify bifurcation points, etc.
Gershman I.S., Bushe N.A., Mironov A.E., Nikiforov V.A.
Self-organization of secondary structures in friction. pp. 329--334.
Summary: Examples show how secondary structures undergo self-organization on friction surfaces of non-ferrous metals. Primarily structural self-organization of friction surfaces is considered. The self-organization processes are interpreted within the framework of ideas of L.I. Bershadskii.
Bershadskii L.I. †, Ghrinkevich K.E., Zamanskii L.S., Yurkevich O.R., Karaseva A.V.
Tribodynamic characteristics of spherical barium hexafferite magnets and ways of their improvement using polymeric coatings. pp. 335--343.
Summary: A method and an experimental installation have been developed for tribodynamic tests of spherical magnets (SM). Regularities and features of the wear mechanism of barium hexaferrite magnets have been studied under dynamic loading. It is established that the Re-binder effect is stimulated by dynamic contact loading of barium hexaferrite. A relation between the force of friction and wear rate has been studied during stationary and dynamic contact loading. The effect of some process factors (heat treatment, polishing) on the wear rate is investigated. The conditions of wear resistance of SM and principles of selecting effective coatings are considered.
Grinkevich K.E.
Some postulates of the structural dynamic concept of the tribosystem and its practical implementation. pp. 344--350.
Summary: A number of experimental facts obtained during stationary and dynamic loading is considered and classified on the basis of the structural dynamic concept of the tribosystem of L.I. Bershadskii. Theoretically predicted postulates of the structural dynamic concept of the tribosystem have been experimentally validated and it is shown that there are dynamic effects on the equilibrium and structural dissipative transitions, tribochemical reactions, intensification of structural evolution and adaptation in the friction zone.
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