Ultrathin film formation under combined effect of surface roughness and surface force for elastohydrodynamic lubrication of point contact problems

Alsamieh, None Mohamed Abd

doi:10.1108/ilt-01-2022-0013

Cited by 3 publications

(4 citation statements)

References 17 publications

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“…The details of the numerical solution of the Reynolds equation are presented in more detail by Al-Samieh and Rahnejat (2001a, 2001b) and Al-Samieh (2022).…”

Section: Background Theorymentioning

confidence: 99%

“…In fact, Chu et al (2012) used mineral oil in their studies with the lubricant model parameters of octamethylcyclotetrasiloxane (OMCTS) presented by Chan and Horn (1984) in their experimental work on the calculation of intermolecular solvation forces and Van der Waals’. Al-Samieh (2022) recently created a numerical solution for the purpose of investigating the combined effect of surface force; solvation and Van der Waals’ and surface topography parameters on the formation of ultra-thin film for elastohydrodynamic lubrication of point contact problems using the OMCTS as the intermediate lubricant using the correct model parameters used by Chan and Horn (1984). In addition to the load variation, he used a sinusoidal waviness with various surface amplitude and wavelength values.…”

Section: Introductionmentioning

confidence: 99%

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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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“…The details of the numerical solution of the Reynolds equation are presented in more detail by Al-Samieh and Rahnejat (2001a, 2001b) and Al-Samieh (2022).…”

Section: Background Theorymentioning

confidence: 99%

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

Self Cite

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“…Yin et al (2019) explored the coupling mechanism of cylinder liner surface roughness distribution and texture, concluding that the combination of surface texture and different surface roughness can improve lubrication performance. (Li and Yang, 2018;Chen et al, 2020;Abd Alsamieh, 2021, 2022 studied the elastic fluid dynamics of point and line contacts while considering roughness influence, determining that surface roughness alters pressure and film thickness.…”

Section: Introductionmentioning

confidence: 99%

“…(Li and Yang, 2018; Chen et al. , 2020; Abd Alsamieh, 2021, 2022) studied the elastic fluid dynamics of point and line contacts while considering roughness influence, determining that surface roughness alters pressure and film thickness.…”

Section: Introductionmentioning

confidence: 99%

Effect of composite textured rough surfaces on the lubrication performance of cylindrical roller bearings

Deng,

Su,

Jin

2024

ILT

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Purpose The purpose of this paper is to study the impact of different types of textures on the friction lubrication performance of cylindrical roller bearings. Design/methodology/approach In the present study, the composite texture hydrodynamic lubrication model that takes into account the effects of surface roughness is established, and the Reynolds equation for the oil film is numerically solved using the finite difference method. The study investigates the oil film carrying capacity and maximum pressure of bearings under two different arrangements of four composite textures and conducts a comparative analysis of the oil film characteristics under various texture parameters and surface roughness levels. Findings When the roughness of the inner texture surface and the contact surface are equal, the bearing capacity of the composite texture is intermediate between the two textures. The impact trend of surface roughness on fluid dynamic pressure effects varies with the type of composite texture; the internal roughness of the texture affects the micro-hydrodynamic pressure action. Composite textures with different depths exhibit improved bearing capacities; elliptical cylindrical parallel and elliptical hemispherical parallel textures perform better when their area densities are similar, while other types of composite textures show enhanced bearing performance as the ratio of their area densities increases. Originality/value This paper contributes to the theoretical investigations and analyses on designing the textured rolling bearings with high lubrication performance. Peer review The peer review history for this article is available at: https://publons.com/publon/10.1108/ILT-02-2024-0050

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Analysis of isothermal elastohydrodynamic lubrication on the rough surface of a new type of trident universal joint

Xu,

Yang,

Wang

et al. 2024

J. Phys.: Conf. Ser.

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Taking the roughness into consideration, this chapter mainly studies the isothermal elastohydrodynamic lubrication between the slider and the balls in the new three-pronged universal joint and gives the relevant equations under isothermal conditions. The Reynolds equation is the primary tool for iteration, and Matlab is used for programming and plotting. In the simulation experiment, the roughness is given as 0. Then the amplitude and frequency of the roughness are varied to observe the oil film thickness and pressure respectively. With the increase of surface fluctuation, the film thickness in the center of the contact range becomes thicker, the pressure changes more and more sharply, and the peak value of secondary pressure is basically unchanged. As the frequency of the sinusoidal roughness increases, the film thickness in the center of the contact area becomes thinner as the frequency of roughness enhances, the fluctuations become more and more frequent, the pressure fluctuates around the original curve more and more often, and the amplitude becomes larger and larger.

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Ultrathin film formation under combined effect of surface roughness and surface force for elastohydrodynamic lubrication of point contact problems

Cited by 3 publications

References 17 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

Effect of composite textured rough surfaces on the lubrication performance of cylindrical roller bearings

Analysis of isothermal elastohydrodynamic lubrication on the rough surface of a new type of trident universal joint

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