Experimental study of real roughness attenuation in concentrated contacts

Šperka, Petr; Křupka, Ivan; Hartl, Martin

doi:10.1016/j.triboint.2009.11.003

Cited by 29 publications

(26 citation statements)

References 42 publications

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“…Ref. 20) have instead confirmed the existence of the so called viscous flattening, an asperity flattening induced by fluid viscous actions at the asperity scale, which results in an effective smoothing of the sliding surfaces. This phenomenon has also been predicted by numerical calculations of wavy surfaces.…”

Section: 10mentioning

confidence: 99%

Lubrication in soft rough contacts: A novel homogenized approach. Part I - Theory

et al. 2011

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We study the lubricated steady sliding contact between rough surfaces of (elastically) soft solids. A novel mean field theory of mixed lubrication is presented, which takes into account the coupled effect of asperity-asperity and asperity-fluid interactions. We calculate the fluid flow factors, and discuss the nature of the transition from the boundary lubrication regime, where the normal load is supported by the asperity-asperity interactions (sometimes mediated by boundary films), to the hydrodynamic regime, where a thin fluid film prevents direct contact between the mating surfaces.

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Section: 10mentioning

confidence: 99%

Lubrication in soft rough contacts: A novel homogenized approach. Part I - Theory

et al. 2011

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“…This small slip assumption allows us to use the numerical solver for pure rolling and the Amplitude Reduction Theory [1] in pure rolling as well, as shown by Ref. [33]. In this study, the rough surface topography used is isotropic.…”

Section: Psd Friction Model Validationmentioning

confidence: 94%

Prediction of the Stribeck curve under full-film Elastohydrodynamic Lubrication

Zhang

Biboulet

Venner

et al. 2020

Tribology International

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A B S T R A C TThe Stribeck curve shows the friction coefficient as a function of speed, viscosity and load. The viscosity times speed over load parameter can be interpreted as a film thickness. The film thickness over roughness parameter unifies friction curves in the isoviscous rigid regime. In this paper, the Stribeck curve is predicted numerically in the full-film Elastohydrodynamic Lubrication regime. It is shown that the lambda ratio is not the most appropriate parameter. A more elaborate parameter including the operating conditions and based on the Amplitude Reduction Theory [1] gives much better results. For a complex surface topography, the full numerical simulation is time-consuming. A rapid prediction method is proposed. Good agreement is found between the full numerical simulation and the prediction. (A.A. Lubrecht).Tribology International xxx (xxxx) xxx-xxx 0301-679X/

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“…This approach has been used to propose simple engineering tools to obtain an estimate of the deformed micro-geometry for real roughness profiles. Model has been already successfully verified by Sperka et al [43] and later used for the study of the complementary wave under rolling/sliding conditions by Sperka et al [44].…”

Section: Amplitude Attenuation Theorymentioning

confidence: 95%

Artificial Surface Roughness Deformation in the Starved EHL Contacts

et al. 2018

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Starved elastohydrodynamically lubricated contact is described as deviation from fully flooded contact due to insufficient lubricant supply. This insufficiency causes thinner lubricant film compared to fully flooded regime. Thinner lubricant film means that rolling surfaces are closer together. Each surface has its own roughness, which is created by machining of the surface and is composed by many individual asperities. These asperities are elastically deformed while passing through the contact area of the EHL contact as well as whole contact surface. It is important to know the magnitude of the deformation. Especially in the starved contact where is increased risk of surface wear due to mutual contact of asperities on the opposite surfaces. This paper presents experimental work on the topic of the surface roughness deformation, which is passing by contact. Analytical method called amplitude attenuation theory was used to predict deformation of the artificial asperity (ridge) under starved conditions. Deformations provided by predictions were compared with the experiments and from both method is clear that roughness deformation is increasing with the progressing starvation-thinning the lubricant film. Magnitude of the deformation however depends on the asperity profile.

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Experimental study of real roughness attenuation in concentrated contacts

Cited by 29 publications

References 42 publications

Lubrication in soft rough contacts: A novel homogenized approach. Part I - Theory

Lubrication in soft rough contacts: A novel homogenized approach. Part I - Theory

Prediction of the Stribeck curve under full-film Elastohydrodynamic Lubrication

Artificial Surface Roughness Deformation in the Starved EHL Contacts

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