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the Response of change of resistance from presence of defect of a surface

Results of theoretical researches of the contact square and

Resistance (гл.2) testify, that presence of defects on surfaces
Friction conducts to change of the nominal square of contact and, as consequence, a pure resistance at affecting on tribouzel a diagnostic current, that is the electric pure resistance is sensitive to origination and presence of defects on surfaces triboobektov.

For the demonstration of the given rule experimental researches on the test-bed are spent, sistemoobrazujushchim a condition in which was frequency of a digitization of a signal 60 kgts, containing in itself two complete revolutions of a head. The given change of initial conditions has allowed to observe periodicity of a signal of resistance depending on presence/occurrence of defects of surfaces.

In drawings 4.11,4.12 samples of signals of resistance and an angle of turn from examinees of installations (a cup and a head №1 of table 37), displaid for every minute tests are presented. Value of resistance R is resulted in relative unit Rn (t) = Ri (tRmax, where n in minutes - the moment of a time of a displaid signal.

Drawing 4.11 - the Signals of resistance registered at the moment of a time 1st and 2nd minute

Drawing 4.12 - the Signals of resistance registered at the moment of a time 3 and 4th minute

The analysis of graphical dependences shows, that sharp, periodical splashes in a pure resistance originate over the range an angle of turn of a head taking into account a lapse of the transfer moment θ = 270. 359o.

According to researches of mathematical model of resistance differences of resistance are a consequence of presence of defects. In drawing 4.13 process of an adhesive adhesion and a dray friction (R1), and also possible defects of friction surfaces (R4) are illustrated. According to theoretical researches (section 2.4) over the range R = [0,1... 0,2] there can be the small fluctuations comparable to a surface free of defects, thus resistance over the range R> 0,2 testifies to presence of defect which conducts to change of operating modes tribosoprjazhenija.

Drawing 4.13 - the Analysis of resistance of friction surfaces at test

The resulted analysis of fluctuations of resistance at test tribosoprjazhenija proves to be true data of the out-of-round gauge and the graphic representations of experimental samples presented in drawing 4.14.

Drawing 4.14 - Images of defects (a waviness of the higher order)

Head surfaces () and cups ()

According to drawings 4.13, 4.14 presence of cutting on a cup and head surface leads vibroudaru or to contact rupture at coal of turn of a head θ = 270. 359o. The carried out researches confirm the pure resistance response (differences of amplitude R from 0,1 to 10 Ohm) on presence

Defects of surfaces (waviness of the higher usages) which conduct to change of operating modes tribosoprjazhenija at tests (vibroudaram, to an abrasive wear, an adhesive adhesion and so forth).

4.3.1

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Scientific source ZHIDKOV Alexey Vladimirovich. the ELECTRORESISTANCE METHOD And the DIAGNOSTIC DEVICE tribouzla with the spherical form of details (ON an instance endoproteza tazobedrennogo a joint with friction pair «metal - metal»). The dissertation on competition of a scientific degree of a Cand.Tech.Sci. An eagle, 2019. 2019

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