No. 4, 1998 - Tribology in Industry

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and systens, and the numbet lf si:ii:r:iific infi-,r'l:,lilietn fi'orn this are is going to i:e larger Still rernains: the problem of their applicability and searching f;rr the shoriest way to practrcal design .urd constructing, 3. TR.IBOLOGICAL PROCESSES IN S,IACHINE ELEMENTS Contemporary classification of classical nlirchine elements to: elements for r:onnection. elements for power transmission, elenrents for rctational rnotions, and elements of armatures anrl hydrauiic installations. did noi diminish the global nced for analysis and identifica-tion of arisen tribolcgical phencmena and proccsses. In the frictional contitct zone of any machine element appelrr complex non-stationary physical-chemical and mechar.l i- cal processes, of stochastic nature, detemtined by the non-unique irifluence of numerous factors. ! ei us rrcntion only the rnost imp;rtanf oire::: pirysical-ciremicll and mechanical properties of elerrelts in contact, rneciiuui, roughness, ma.nufacturing accuracy, load (rnagnit',ide and character of variatiort), spe ed and acceicration, tcr:',- per.tture of ccntirct suliaces, *tc. Processes on contact surfaces are, by their nalure, stochastic and af ccntiriuos duration, Non-unique influence of numerous factors Iearis to an-rbiguous results: nragnriricl,.r of the friction force and wear. Coinplexty of tribological phenornena in mircirine elements, especially in elements for pcwer transnrissii-rn and eiements for rotation:rl motions, Coes irot imply that the processe s of friction and u,ear are totally out of control. N'{oijern kno*'iedge and availabie iniormation of the
NIacli!nc eiem*irts exploitation c;vcic, initial c:onditions Material Environmcnta rwl d.iE:.iif I kgg charactcristics Manufactur accuracY Contact nature Mutual interactions of activc surfaces {frictional couples) ..:.RealbontaCt Meclianical constraints Aton.iic-molocular tlonds Friction tempcralure Processes of adsorption Elastohydlodinamic eflects Adlicsion frict Chernical Friction Deformational frict. comoon. ,,ClJa11g9s,ilr sunilce, layer Structural Deforrnation and strcss Numbcr of 'fimc of corrt. oFDratrot'l Kinematic aranleters Dyuarnic Srameterrs Workilig lilc Figure I. General picture oi tnacltine elenrctt$ erploitation c,-c!es working life of machine elements. Influence of large nurnber of otherfactors, that define initial and additional conditicns, that appeared in the friction and wear processes, is still poorly investigated, and even less accepteil in practiee. All these testify about necessiry of more intensrve development of machine elements trib
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No. 4, 1998 - Tribology in Industry

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