Experimental and numerical investigation on single dent with marginal bump in EHL point contacts

Wang, Xuefeng; Hu, Ruizhen; Weiyan, Shang; Zhao, Fuzhou

doi:10.1108/ilt-03-2016-0070

Cited by 3 publications

(2 citation statements)

References 25 publications

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“…The separation between the surfaces in such cases is in a nanometer scale; of the order of the molecular diameter of the intervening liquid. Glovnea et al (2003), Armando et al (2003), Krupka et al (2007) and Feng Wang et al (2017) experimentally investigated the lubrication behavior of a single transverse ridge in elastohydrodynamic contact using an optical interferometric technique. They found that the ridge affects the local film and the corresponding pressure profiles at the location of the ridge.…”

Section: Introductionmentioning

confidence: 99%

Performance of a transverse ridge located through the contact zone of an ultra-thin film including surface force effect

Alsamieh

2023

ILT

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Purpose The purpose of this paper is to investigate the performance of an ultra-thin film lubricated conjunction through the elastohydrodynamic lubrication of point contacts for various ridge shapes and sizes located within the contact zone including flat-top, triangle and cosine wave profiles, considering the influence of surface forces of solvation and Van der Waals’ in addition to the hydrodynamic effect to predict an optimum geometric characteristics for surface texture for lubricated conjunctions. Design/methodology/approach Surface features are simulated in a variety of sizes and shapes including flat-top, triangle and cosine wave profiles. While estimating the elastic deformation of the contacting surfaces, surface forces of solvation and Van der Waals’ are taken into account. The Reynolds equation is solved using the Newton–Raphson method to get the pressure profile and film thickness including the elastic deformation, and surface feature. Findings The geometrical characteristics of the ridge, its placement in relation to the contact zone and its height all have a significant impact on the performance of ultra-thin film lubricated conjunction. When the triangular-shaped ridge is present in contact, it forecasts even sharper peaks in film thickness and pressure. More friction, wear and eventually contact fatigue are brought on by this more acute pressure and film thickness peaks. The flat-top ridge shape shows a better performance for lubricated conjunction where, the minimum film thickness value is comparable to that obtained for the case of a smooth contact surface. This behavior is attributed to the effect of intermolecular force of solvation. An increase in the size of the ridge results in a step increase in the film thickness for different ridge shapes, particularly for the flat-topped ridge pattern. Originality/value Evaluation of the performance of elastohydrodynamic lubricated ultra-thin film conjunction related to film thickness and pressure profile for various ridge surface features of different amplitudes, shapes and sizes located through the contact zone considering the influence of surface forces of solvation and Van der Waals’ in addition to the hydrodynamic effect. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-03-2023-0062/

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Section: Introductionmentioning

confidence: 99%

Performance of a transverse ridge located through the contact zone of an ultra-thin film including surface force effect

Alsamieh

2023

ILT

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“…They found that the ridge geometry affects the formation of film thickness perturbations in the high-pressure region of the contact. Kaneta et al [14], Krupka et al [15] and Feng Wang et al [16] used optical interferometry technique to study the transient effects of transversely-oriented moving ridges having different heights on point contact elastohydrodynamic lubricated films. They found that the ridge affects local film profiles depending on the velocity of the rough surface relative to that of the smooth surface.…”

Section: Introductionmentioning

confidence: 99%

Archive of Mechanical Engineering

Al-Samieh

2020

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Ridge geometry effect on the behavior of elastohydrodynamic lubrication of point contact problemA numerical solution is presented to investigate the influence of the geometry and the amplitude of the transverse ridge on the characteristics of elastohydrodynamic lubrication for point contact problem under steady state condition. Several shapes of ridges with different amplitudes are used in the stationary case, such as flattop ridge, cosine wave ridge and sharp ridge of triangular shape. Results of film thickness and pressure distributions of the aforementioned ridge feature are presented at different locations through an elastohydrodynamically lubricated contact zone for different amplitude of the ridge. Simulations were performed using the Newton-Raphson iteration technique to solve the Reynolds equation. The numerical results reveal that, to predict optimum solution for lubricated contact problem with artificial surface roughness, the geometrical characteristics of the ridge should have profiles with smooth transitions such as those of a cosine wave shape with relatively low amplitude to reduce pressure spike and therefore cause the reduction in the film thickness. The position of the location of the ridge across the contact zone and the amplitude of the ridge play an important role in the formation of lubricant film thickness and therefore determine the pressure distribution through the contact zone.

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Effect of changing geometrical characteristics for different shapes of a single ridge passing through elastohydrodynamic of point contacts

Alsamieh

2021

ILT

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Purpose The purpose of this paper is to study the behavior of a single ridge passing through elastohydrodynamic lubrication of point contacts problem for different ridge shapes and sizes, including flat-top, triangular and cosine wave pattern to get an optimal ridge profile. Design/methodology/approach The time-dependent Reynolds’ equation is solved using Newton–Raphson technique. Several shapes of surface feature are simulated and the film thickness and pressure distribution are obtained at every time step by simultaneous solution of the Reynolds’ equation and film thickness equation, including elastic deformation. Film thickness and pressure distribution are chosen to be the criteria in the comparisons. Findings The geometrical characteristics of the ridge play an important role in the formation of lubricant film thickness profile and the pressure distribution through the contact zone. To minimize wear, friction and fatigue life, an optimal ridge profile should have smooth shape with small ridge size. Obtained results are compared with other published numerical results and show a good agreement. Originality/value The study evaluates the performance of different surface features of a single ridge with different shapes and sizes passing through elastohydrodynamic of point contact problem in relation to film thickness and pressure profile.

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Experimental and numerical investigation on single dent with marginal bump in EHL point contacts

Cited by 3 publications

References 25 publications

Performance of a transverse ridge located through the contact zone of an ultra-thin film including surface force effect

Performance of a transverse ridge located through the contact zone of an ultra-thin film including surface force effect

Archive of Mechanical Engineering

Effect of changing geometrical characteristics for different shapes of a single ridge passing through elastohydrodynamic of point contacts

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