Observation and experimental investigation on cavitation effect of friction pair surface texture

Wang, Jianhao; Yan, Zhijun; Fang, Xun; Shen, Ziyu; Pan, Xinxiang

doi:10.1002/ls.1520

Cited by 21 publications

(8 citation statements)

References 22 publications

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“…This phenomenon has also been proven by several researchers. As the speed increases, the hydrodynamic lubrication effect of micro pits becomes more obvious, resulting in a greater hydrodynamic lift to separate the two surfaces and reduce the friction coefficient (Wang et al , 2020; Li et al , 2014; Zhang et al , 2016; Wang, 2016).…”

Section: Resultsmentioning

confidence: 99%

Study on the subsurface characteristics of textured surfaces under EHL condition

Li,

Du,

et al. 2024

ILT

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Purpose The purpose of this study is to investigate the influence of surface texture on the subsurface characteristics of contact interfaces under elastohydrodynamic lubrication condition. As a typical contact form of gears and bearings, the optimization of friction characteristics at the elastohydrodynamic lubrication (EHL) interface has attracted the attention of scholars. Laser surface texturing is a feasible optimization solution, but there have been concerns about whether the surface texture of high-pair parts will affect their fatigue life. Design/methodology/approach To examine the impact of texture preparation on the subsurface characteristics of high-pair interfaces under EHL conditions, a point contact EHL model is developed that takes into account the effect of textured surface topography. The pressure and thickness of the oil film are calculated as input parameters under different loads and entrainment velocities. The finite element method is used to simulate the impact of textures with varying diameters, densities and depths on the subsurface characteristics of the elastohydrodynamic interface. According to ISO 25178, analyze the relationship between 3D topography parameters and subsurface characteristics and study the trend of friction characteristics and subsurface characteristics based on the results of the ball on disc friction tests. Findings The outcomes suggest that under different rotational velocity and load conditions, the textured surfaces exhibit improved friction reduction effects; however, the creation of textures can result in significant subsurface plastic deformation and local peeling. The existence of texture makes the larger stress zone in the subsurface layer closer to the surface, leading to fatigue failure near the surface. Reasonable design parameters can help enhance the attributes of the subsurface. A smaller Sa and a Str greater than 0.5 can achieve ideal subsurface properties on the textured surface. Originality/value This paper investigates the influence of surface texture on the friction and subsurface characteristics of EHL interfaces and analyzes the impact of surface texture on interface contact performance while achieving lubrication improvement functional characteristics. The results provide theoretical support for the optimization design and functional regulation of surface texture in EHL interfaces. Peer review The peer review history for this article is https://publons.com/publon/10.1108/ILT-10-2023-0324/

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Section: Resultsmentioning

confidence: 99%

Study on the subsurface characteristics of textured surfaces under EHL condition

Li,

Du,

et al. 2024

ILT

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“…Take any three textures from a set of experiments for demonstration, and the flowchart of the genetic factors is shown in figure (4). Genetic factors of the parent generation are randomly constructed, and the fitness of each texture is calculated using the genetic factors.…”

Section: Development Of the Algorithm Programmentioning

confidence: 99%

“…Therefore, the micro-texturing has become an effective an antifriction technique, and attracted the attention of vast quantities of researchers. Firstly, researchers focused on regular textures, including groove-shaped textures [3][4][5], elliptical textures [6][7][8], cone-shaped textures [9], and non-linear textures [10], which have all played a certain degree of optimization role compared to smooth friction pairs. Some researchers also drew inspiration from animals and plants in nature, such as snake-shaped textures [11], shark skin [12], salamander toes [13], and lotus leaf patterns [14].…”

Section: Introductionmentioning

confidence: 99%

Improvement of lubrication performance of sliding pairs with multi-depth groove textures based on genetic algorithm

Dong

et al. 2023

Surf. Topogr.: Metrol. Prop.

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During the wear and tear process of bearings, the friction coefficient between the friction pairs can be effectively decreased by employing the suitable surface texture on the frition surface. In the study, the distribution and depth variation of the surface texture were used as variables, and the genetic algorithm was used for iterative optimization to obtain the optimal texture distribution and depth. The friction and wear performance of the rectangular texture bearing sliding blocks was optimized. The depth of the texture was represented by a 4-bit binary number, and different binary numbers were set to represent different texture depths. Finally, the genetic algorithm was used for continuous iteration and evolution to obtain the optimal texture combination. The study showed that, compared with the regular texture with a depth of 0.2 μm, the friction coefficient decreased by 15.0% under the optimal texture with a non-uniform depth. Simultaneously, compared with the regular 3μm deep texture, testure with a optimized depth makes the friction coefficient decreased by 37.5%, and the minimum oil film thickness increased by 0.979μm. The optimal texture and oil film thickness combination obtained from the study can effectively reduce solid contact force and alleviate mechanical wear.

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“…In addition, Yang et al (2019) and Gao et al (2020) analyzed the sealing performance of radial linear grooves, and a phase change flow model considering both cavitation and boiling effects was used. Afterward, Wang et al (2020) experimentally investigated the influence of cavitation effect caused by the surface texture on the lubrication performance of friction pairs. Bulut et al (2021) discussed the relationship between cavitation and film thickness in parallel sliders with rectangular grooves and inclined grooves on both sides.…”

Section: Introductionmentioning

confidence: 99%

Study on the hydrodynamic performance of two typical groove liquid film seals considering cavitation

Li²,

Hao

et al. 2023

ILT

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Purpose The purpose of this paper is to investigate the hydrodynamic performance of liquid film seals with oblique grooves (OGs) and spiral grooves (SGs), considering cavitation, compare and analyze the differences between them. Design/methodology/approach Considering cavitation effect, the incompressible steady-state Reynolds equation was solved to obtain the sealing performance parameters of the liquid film seal with oblique groove and spiral groove. Findings The hydrodynamic performance of oblique groove seal (OGS) and spiral groove seal (SGS) shows a similar trend with the change of operating parameters. When the groove angle is less than 20°, the load-carrying capacity of SGS is better than that of OGS, while when the groove angle continues to increase, the hydrodynamic performance of OGS is slightly better than that of SGS, and more suitable for use under small differential pressure and high speed. Originality/value The hydrodynamic characteristics of liquid film seals with oblique grooves and spiral grooves considering cavitation effect were studied, which provides a theoretical reference for the application of oblique groove seal.

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Observation and experimental investigation on cavitation effect of friction pair surface texture

Cited by 21 publications

References 22 publications

Study on the subsurface characteristics of textured surfaces under EHL condition

Study on the subsurface characteristics of textured surfaces under EHL condition

Improvement of lubrication performance of sliding pairs with multi-depth groove textures based on genetic algorithm

Study on the hydrodynamic performance of two typical groove liquid film seals considering cavitation

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