Desorption-adhesion mechanism of wear under boundary lubrication

Adhesion-hydrodynamic (AHD) model of friction

“…The presence of a near surface gas layer at the interface is confirmed experimentally [11]. Visually observed gas-air cavities in the diffuser zone (DZ) of the tribocontact appeared in dynamic equilibrium under ultralow linear loads and at ultralow velocities (0.1 N/mm in the linear contact of a shaft 9 long with a radius of 80 mm with a plane and 0.04 m/s, respec tively).…”

“…The literature data [1][2][3][4][5][6][7][8] and our results [10][11][12] allow us to formulate the following main properties of boundary lubricating films:…”

“…However, the noncontact zones, which affect the distribution of a lubricant in the elastically deformed zones, are also not unimportant. The inte gration of the experimental data from [10][11][12] has allowed us to establish an interrelation between the processes that occur during the nonreciprocal sliding friction in typical elastically deformed zones II, III, and IV ( Fig. 1a) in the direction of the movement of the shaft: confuser zone (CZ) → transition zone (TZ) → diffuser zone (DZ).…”

“…Taking into account the results obtained in this work and the generalized data of our previous studies [10][11][12]14], the following adhesion-hydrodynamic (AHD) model of the friction of a radial sliding bearing is proposed (Fig. 2).…”

“…4). The experimental dependence P(x) was obtained using an ASB 02M tribometer [11] under the following conditions: the lubricant was IPM 10 oil, the specimens were a model fluoroplastic shaft 80 mm in diameter and 9 mm long, as well as a model plane bearing made from unoriented Plexiglas, the fre quency of rotation of the shaft was ω = 20 rpm, the lin ear velocity of sliding of the shaft was = 0.09 m/s, the axial load applied to the contact was N = 0.4 N, the calculated width of the contact was b = 0.145 mm, the maximum contact stresses calculated by Hertz's for mula (1) were σ max = 0.389 MPa, and the ambient pressure was 102 kPa. The pressure intake was 0.2 mm wide and 6 mm long; the speed of scanning was 0.002 mm/s and the direction of scanning was oppo site to the direction of sliding.…”