A Novel Modeling Method of Micro-Topography for Grinding Surface Based on Ubiquitiform Theory

Liu, Yue; An, Qi; Huang, Min; Shang, Dajing; Bai, Long

doi:10.3390/fractalfract6060341

Cited by 3 publications

(2 citation statements)

References 48 publications

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“…Das et al analyzed several parameters in parallel and found high deviations in the Ssk parameter in the case of extruded surfaces [46]. Liu et al analyzed ground surfaces based on the Ssk parameter and also found relatively high fluctuation in the parameter value [47].…”

Section: Resultsmentioning

confidence: 99%

Asymmetric Height Distribution of Surfaces Machined by Hard Turning and Grinding

Molnár

2022

Symmetry

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The asymmetric height distribution of a machined surface can be useful from a tribological point of view in several cases. The purpose of this study is to analyze this asymmetry based on the 3D surface texture parameter skewness, providing technological parameter values that help in achieving favorable surfaces. A 16MnCr5 case-hardened steel (62–63 HRC) was machined by hard turning and grinding based on a comprehensive design of experiments and the topography of the surfaces was measured and analyzed. The texture parameter that informs about the height distribution of the surface points (skewness, Ssk) was compared to the volume parameters peak material volume (Vmp) and valley void volume (Vvv). The main finding is that negative Ssk values are found at low Vmp and Vvv values, which confirms the favorable tribological properties.

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Section: Resultsmentioning

confidence: 99%

Asymmetric Height Distribution of Surfaces Machined by Hard Turning and Grinding

Molnár

2022

Symmetry

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“…Haruyama et al [20] obtained the formula between the metal gasket (with surface topography parameters) and the volume leakage rate through experiments. Liu et al [21] constructed an anisotropic W-M function based on ubiquitiform theory. They established a model of the grinding surface that can accurately characterize the fractal features of the grinding surface.…”

Section: Introductionmentioning

confidence: 99%

Analysis and Experimental Verification of the Sealing Performance of PEM Fuel Cell Based on Fractal Theory

Han

Wang

et al. 2023

Fractal Fract

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Aiming to accurately predict the leakage rate of the sealing interface, this work proposes a two-dimensional finite element model of a proton exchange membrane fuel cell, which includes the microscopic surface morphology and the asperity contact process of the components. First of all, we constructed the surface morphology of the seal by the two-dimensional W-M (Weierstrass–Mandelbrot) fractal function and explored the influence of fractal dimension (D) and scale parameter (G) on the surface profile. Furthermore, the finite element method and Poiseuille fluid theory were adopted to obtain the deformation variables of the asperity under different clamping pressures and leakage rates. Moreover, we quantitatively analyzed the impact of surface roughness on the clamping pressure and leakage rate. It was found that both the surface amplitude and surface roughness are positively correlated with G and negatively correlated with D. Surface morphology is proportional to D but has no relationship with G. Additionally, the deformation asperity decreases exponentially with growing clamping pressure, and the leakage rate is consistent with the experimental values at a clamping pressure of 0.54 MPa. With the same leakage rate, when the seal surface roughness value is less than 1 μm, a doubled roughness value leads to an increase of 31% in the clamping pressure. In contrast, when the surface roughness of the seal is greater than 1 μm, a doubled roughness value induces an increase of 50% in the corresponding clamping pressure.

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A Novel Contact Resistance Model for the Spherical–Planar Joint Interface Based on Three Dimensional Fractal Theory

An,

Wang,

Huang

et al. 2024

Fractal Fract

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In order to obtain the contact resistance of relay contacts more accurately, a novel contact resistance model for the spherical–planar joint interface is constructed based on the three-dimensional fractal theory. In this model, three-dimensional fractal theory is adopted to generate a rough surface at microscopic scale. Then, using contact mechanics theory, the deformation mechanism of asperities on rough surfaces is explored. Combined with the distribution of asperities, a contact resistance model for the planar joint interface is established. Furthermore, by introducing the surface contact coefficient, cross-scale coupling between the macro-geometric configuration and micro-surface topography is achieved, and a contact resistance model for the spherical–planar joint interface is constructed. After that, experiments are conducted to verify the accuracy of the proposed model, and the maximum relative error of the proposed model is 8.44%. Ultimately, combining numerical simulation analysis, the patterns of variation in contact resistance influenced by factors such as macroscopic configuration and microscopic topography are discussed, thereby revealing the influence mechanism of the contact resistance for the spherical–planar joint interface. The proposed model provides a solid theoretical foundation for the optimization of relay contact structures and improvements in manufacturing processes, which is of great significance for ensuring the safe and stable operation of power systems and electronic equipment.

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A Novel Modeling Method of Micro-Topography for Grinding Surface Based on Ubiquitiform Theory

Cited by 3 publications

References 48 publications

Asymmetric Height Distribution of Surfaces Machined by Hard Turning and Grinding

Asymmetric Height Distribution of Surfaces Machined by Hard Turning and Grinding

Analysis and Experimental Verification of the Sealing Performance of PEM Fuel Cell Based on Fractal Theory

A Novel Contact Resistance Model for the Spherical–Planar Joint Interface Based on Three Dimensional Fractal Theory

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