Effect of surface texturing on lubrication film formation and rolling contact fatigue within mixed lubricated non-conformal contacts

Vrbka, Martin; Křupka, Ivan; Šamánek, O.; Svoboda, Petr; Vaverka, Michal; Hartl, Martin

doi:10.1007/s11012-010-9288-x

Cited by 28 publications

(12 citation statements)

References 31 publications

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“…In the case of non-conformal contacts, recently a number of researchers started to investigate the effect of above mentioned parameters [34,45,[51][52][53][54][55][56][57][58].…”

Section: Important Parametersmentioning

confidence: 99%

An overview of geometrical parameters of surface texturing for piston/cylinder assembly and mechanical seals

et al. 2015

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Surface texturing has been effectively used to improve tribological performance of sliding surfaces. Reduction in friction, increase in hydrodynamic load carrying capacity, reduction in wear and increase in fluid film stiffness are few examples of the benefits that can be obtained by surface texturing. In order to obtain these benefits, several researchers have investigated the effects of surface texturing geometrical parameters on the performance of different applications. If these geometrical parameters are not optimized for each application, they may have detrimental effects on their performance. These geometrical parameters in case of micro dimples include depth, diameter, depth to diameter ratio, shape and density of dimples. In this paper, the author reviews the effects of these geometrical parameters on the performance of two applications piston ring/cylinder assembly and mechanical seals.

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“…In the case of non-conformal contacts, recently a number of researchers started to investigate the effect of above mentioned parameters [34,45,[51][52][53][54][55][56][57][58].…”

Section: Important Parametersmentioning

confidence: 99%

An overview of geometrical parameters of surface texturing for piston/cylinder assembly and mechanical seals

et al. 2015

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“…Hsu suggested that chemistry modification or coatings to protect the textures need to be developed. Krupka and Vrbka et al [13,[16][17][18][19] also reported that the degradation of indentation found after fatigue test indicated that the failure of component was possibly attributed to the wear of the textured surface. Therefore, improvement measures can be focused on to increase the surface durability of indentation served under high pressure conditions, which might assure adequate fatigue strength of patterned surface.…”

Section: Introductionmentioning

confidence: 98%

Towards near-permanent CoCrMo prosthesis surface by combining micro-texturing and low temperature plasma carburising

Dong

Svoboda

Vrbka

et al. 2016

Journal of the Mechanical Behavior of Biomedical Materials

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An advanced surface engineering process combining micro-texture with a plasma carburising process was produced on CoCrMo femoral head, and their tribological properties were evaluated by the cutting-edge pendulum hip joint simulator coupled with thin film colorimetric interferometry. FESEM and GDOES showed that precipitation-free C S-phase with a uniform case depth of 10μm was formed across the micro-textures after duplex treatment. Hip simulator tests showed that the friction coefficient was reduced by 20% for micro-metre sized texture, and the long-term tribological property of microtexture was enhanced by the C-supersaturated crystalline microstructure formed on the surface of duplex treated CoCrMo, thereby enhancing biotribological durability significantly. In-situ colorimetric interferometry confirmed that the maximum film thickness around texture area was 530nm, indicating that the additional lubricant during sliding motion might provide exceptional bearing life.

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“…Also, some experimental researches of mixed EHL in point contacts had been done. By using the film colorimetric interference method, the researchers [17][18][19][20][21] had studied the real roughness, surface groove and micro-dents, surface texture effects on film thickness and fatigue life. Relative optical intensity interference was used to measure the mixed EHL film thickness under high-pressure condition by Xiao et al, 22 and the fitting equation between contact load ratio and influence factors (speed, load, roughness, viscosity and equivalent elastic modulus) was developed.…”

Section: Introductionmentioning

confidence: 99%

Mixed thermal elastohydrodynamic lubrication analysis with dynamic performance of aero ball bearing during start-up and shut-down

Shi

Zhao

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part J:

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In this study, a coupling model is developed to include the aero ball bearing dynamic performance in the mixed thermal elastohydrodynamic lubrication analysis, and the low-speed and heavy-load conditions during start-up and shut-down are involved. Based on the bearing quasi-dynamics, the inside motion state of the main loading surface is obtained, and the mixed thermal elastohydrodynamic lubrication is conducted to get bearing lubrication state and properties. The numerical lubrication model under low-speed and heavy-load conditions is validated against published tested data, which reveal well consistency in central film thickness. The lubrication properties between a single ball and inner race during start-up have been studied, which indicate the lubrication film transforms from boundary lubrication to unsafe mixed thermal elastohydrodynamic lubrication, and then goes into safe lubrication. The lubrication properties of the balls at different azimuths have been investigated during shut-down and compared with those in start-up, which have a similar opposite changing trend, but not a simple invertible process. The time in boundary lubrication region during shut-down is shorter, and the ball number in boundary lubrication region gets less, which means the lubrication properties are relatively better. At last, the parametric study on mixed thermal elastohydrodynamic lubrication properties during shut-down has been carried out. It is found that the small bearing curve coefficient and increasing ball number can reduce the boundary lubrication time and improve the bearing lubrication.

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Effect of surface texturing on lubrication film formation and rolling contact fatigue within mixed lubricated non-conformal contacts

Cited by 28 publications

References 31 publications

An overview of geometrical parameters of surface texturing for piston/cylinder assembly and mechanical seals

An overview of geometrical parameters of surface texturing for piston/cylinder assembly and mechanical seals

Towards near-permanent CoCrMo prosthesis surface by combining micro-texturing and low temperature plasma carburising

Mixed thermal elastohydrodynamic lubrication analysis with dynamic performance of aero ball bearing during start-up and shut-down

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