No. 1, 1998 - Tribology in Industry

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l, (.i, r.)1, Ilrl. llD- 1 45 1 _4n t.t3 1.00 Figure 2. Relativ'e rlariaticttt of clrcractetistic paranleter(a, h) t'crsu sliding velocity,: 1 - pol.vcarbonatc * fiber; 2 - polycarbottate + ntodificd fiber With increasing sliding velocity the amplitude distribution expands into the region of Iarge amplitudes. The studied statistics vary too. The presence of coarse wear particles (formed at high velocities) points to the fact that plastic deformation processes localize in wide areas and fracture onsets in the near-surface layer with further microcrack penetration onto the friction surface and large fragments spalling. This rises activity of emission sources conditioned by the growth of microcracks in the polymer contact layer and total increase of the acoustic flow activity. Further increase of velocify Ieads to rising surface temperature. The phenomenon of frictional heiitingof engaged material surfarces reduces both arcoustic signal intensity and the studied statistics. The actual contact area of friction surfaces expands, which causes increased adhesive interaction leading to sticking. Sticking is accompanied by abrupt augment of acoustic signal and its statistics. It is evident that heating would evoke abrupt increase in the molecular constituent of the friction coefficient and result, in a number of cases, in seizure accompanied by spalling of large lumps from the friction surface. At seizure characteristic parameterr(a, D) shows jerkry character. 5. CONCLUSION The combined analysis of acoustic ancl fixed state data of the fdction contact (debris distribution by size) has shown sensitivity of statistics to practically all phenornena occurring at friction and wear. The obtained dependences of these statistics ou external factors made it possible to forrnulate new criteria for determining friction joint durability. REFERENCES ft.1 Kabnykova 7'.F. and Kholodilot, O.V., On Statistical Description of Rough Surfaces, The Joint Soviet- American Conf, "New Materials and Technologie.s in Tribology", Abstracts, Minsk (1992), 207 -202.- [2.] Moiseeva T.ll{., O.strovslq 8.1., Kalmykova T.F. ard Kholodilov O.V., On statistical I)escription of Rough Surfaces, J. of Friction and Wear, 14 (7993), 140-142. [3.) N[oiseo,a 7.M., Kalrnykova T.F. otul Kholodilot, O.V., Multidimensional Statistical Anall,sis of the Problems of 'fribosystem State ldentification, Proc. Int. Conf. "Computer Methods ancl Inverse Problems in Nondestructive Testing and Diagnostics", CM NDT-95, Minsk, IJelarus (199-5), 2I5 -227. 26 Tlibologt itt irttlustry, Volurne 20, No. 1, 1998.
-- UDK (i21.83(r.004.tr M. OGNJANOWC, P. OBR" DOWC Modelling of High-pressure Dynamic Sealing Joints I C) E LU LU E. Modelling is a pro
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No. 1, 1998 - Tribology in Industry

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