Fractal variation of three-dimensional surface topography during sliding wear under mixed elastohydrodynamic lubrication

Zhao, Jiang; wang, zekun; Li, Zhengminqing; Zhang, Hong; Zhu, Rupeng

doi:10.1088/2051-672x/ac2a10

Cited by 6 publications

(4 citation statements)

References 43 publications

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“…What is shown in Figure 1 is the schematic diagram of the box-counting method. 29 For an M n × M n image, the whole image can be covered by a grid of e × e × e ‘, where e’ = e × G/M . u e and b e were the maximum and minimum gray levels of the image in region e × e , respectively.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

Modeling and analysis of sliding wear based on fractal surface reconstruction in line contact mixed lubrication

Zhao

Sheng

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part J:

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In mixed lubrication, the direct rough contact between the two contact surfaces causes material wear and lead to the variation of the surface micro-topography. In turn, the variation of the micro-topography affects the lubrication state between the two contacting surfaces. For the better comprehension of the interaction of lubrication and wear on rough surfaces in mixed lubrication, in this paper, a coupled model of fluid flow, rough contact, and surface wear was established, with fractal theory being applied to predict the changes in surface microtopography. Furthermore, the effects of fractal dimension, roughness direction, contact load and slide-roll ratio on the surface contact area ratio, accumulated wear, film thickness and friction coefficient are analyzed. The results demonstrated that surfaces with large fractal dimension have denser roughness peaks, resulting in larger contact areas and more severe wear. Transverse roughness surfaces exhibit better lubrication and wear performance compared to longitudinal and isotropic surfaces. In addition, increasing the contact load and slip-roll ratio increases the contact area ratio, resulting in lower lubricating performance and increased wear.

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Section: Theoretical Backgroundmentioning

confidence: 99%

Modeling and analysis of sliding wear based on fractal surface reconstruction in line contact mixed lubrication

Zhao

Sheng

et al. 2022

Proceedings of the Institution of Mechanical Engineers, Part J:

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“…The methods used to describe the rough surface include the numerical simulation method, motif method, power spectral density method, wavelet transform and fractal theory, but the most commonly used one is the fractal function, as it can characterize the complexities of surface morphologies, has strong descriptive stability and is not limited by sampling length. According to research (Wang and Chung, 2013), the morphology of rough surface has fractal characteristics, and fractal function can be used to describe the surface morphology of friction pair (Yu et al , 2021; Zhao and Wu, 2016; Zhao et al , 2021). Weierstrass and Mandelbrot (Majumdar and Bhushan, 1990) proposed a rough surface profile fractal function (the W–M function) to precisely describe and construct rough surfaces.…”

Section: Introductionmentioning

confidence: 99%

Influence of manufacturing surface topography on torque and load bearing capacity of hydro-viscous drive clutch under mixed lubrication stage

Chen,

Han,

Zeng

et al. 2024

ILT

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Purpose Hydro-viscous drive (HVD) clutches are widely used in equipment requiring soft start, such as fans and pumps, to transmit torque and adjust speed by changing the gap distance between friction pairs. This paper aims to propose a novel two-parameter evaluation method for HVD during the mixed lubrication stage. The objective is to develop an effective model that establishes the relationship between these parameters and the actual surface topography. Design/methodology/approach In the presented methods, the fractal features of the real manufacturing surface are calculated based on the power spectrum function by the ultra-depth three-dimensional microscope. After that, the hybrid friction model of the friction plate is established based on mixed elasto-hydrodynamic lubrication theory, boundary friction model and fractal theory. Then the torque and load bearing characteristics of the clutch are obtained, and the influences of the surface fractal features are investigated and discussed. Finally, the Weierstrass–Mandelbrot function is adopted for the surface topography characterization and evaluation. Findings The results indicate that the proposed method exhibits good accuracy, while the speed difference between the friction pair exceeds 2,500 rpm. It is concluded that this paper proposed a way to evaluate the torque and loading capacity of HVD considering the real manufacturing surface topography and is helpful for surface optimization. Originality/value The originality and value of this study lie in its development of a novel torque and load bearing capacity evaluation method for HVD in mixed lubrication stage, considering manufacturing surface topography and describing the real manufacturing surface.

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“…Zuo [7] investigated the three-dimensional morphology of HNBR planes after testing and discovered that hard particles have a minimal impact on microfabrication. Zhao [8] proposed a model-based method for the numerical simulation and characterization of sliding wear surface morphology evolution using a deterministic elastohydrodynamic lubrication (EHL) model and a surface 3D morphology fractal method. The validity of the lubrication model was verified through oil film thickness measurements, and the actual surface wear coefficients were obtained from wear experiments.…”

Section: Introductionmentioning

confidence: 99%

Planar Reconstruction of Regular Surfaces’ Three-Dimensional Morphology and Tribology Application

Xu,

Feng,

Xiao

et al. 2023

Lubricants

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The three-dimensional morphology of frictional sub-surfaces holds significant importance for studying tribological issues. However, the uniformity of the horizontal datum in 3D scanning is limited for curved surfaces, resulting in the inability to obtain accurate contour characterization parameters from the scanning results. This study aims to address this issue by constructing regular surface equations and normalizing the 3D profiler scanning results. By fitting the data, a “plane” surface representative of the surface features is obtained, and the paper demonstrates this approach on the surface morphology of different worn parts in the frictional area of spherical bearings located in the specific environment of the Three Gorges gate. The results indicate that the obtained “plane” effectively reconstructs the three-dimensional morphology map of the regular surface. Moreover, this reconstructed plane not only clearly illustrates the surface characteristics but also provides the foundation for analyzing the wear mechanism.

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Fractal variation of three-dimensional surface topography during sliding wear under mixed elastohydrodynamic lubrication

Cited by 6 publications

References 43 publications

Modeling and analysis of sliding wear based on fractal surface reconstruction in line contact mixed lubrication

Modeling and analysis of sliding wear based on fractal surface reconstruction in line contact mixed lubrication

Influence of manufacturing surface topography on torque and load bearing capacity of hydro-viscous drive clutch under mixed lubrication stage

Planar Reconstruction of Regular Surfaces’ Three-Dimensional Morphology and Tribology Application

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