scholarly journals Numerical Generation and Contact Analysis of Rough Surfaces in Concrete

2021 ◽  
Vol 19 (7) ◽  
pp. 864-885
Author(s):  
Mohit Pundir ◽  
Guillaume Anciaux
Keyword(s):  
Rough Surfaces ◽  
Contact Analysis ◽  
Numerical Generation

Effect of the finite size of generated rough surfaces on the percolation threshold

2019 ◽  
Vol 233 (16) ◽  
pp. 5897-5902 ◽  
Author(s):  
Zhimeng Yang ◽  
Xiaoyu Ding ◽  
Jianhua Liu ◽  
Feikai Zhang
Keyword(s):  
Percolation Threshold ◽  
Rough Surfaces ◽  
Finite Size ◽  
Sampling Interval ◽  
Search Method ◽  
Transform Method ◽  
Sealing Performance ◽  
Fast Fourier Transform Method ◽  
Numerical Generation ◽  
Autocorrelation Length

Percolation threshold is a very important parameter to estimate the sealing performance. Thus, it is crucial to determine the correct value of the percolation threshold for contact sealing surfaces. In this paper, we applied a numerical generation method, in which the autocorrelation length can be easily controlled, to obtain different Gaussian isotropic rough surfaces. Then, the contact status between a rigid flat half-space and numerically generated rough surfaces were calculated using the conjugate gradient-fast Fourier transform method. Based on the contact status, the percolation threshold was obtained using a search method. The calculated results established that the percolation threshold of [Formula: see text] is determined for Gaussian isotropic contacting rough surfaces. To obtain an exact value of the percolation threshold, the finite size of the generated rough surfaces should be six times greater than the autocorrelation length, and the autocorrelation length should not be smaller than 20 times the sampling interval.

Study on Reconstruction of Fractal Rough Surfaces

2013 ◽  
Vol 278-280 ◽  
pp. 527-530
Author(s):  
Nan Zhang ◽  
Li Hua Wang ◽  
Yu Song He ◽  
Zi Lu
Keyword(s):  
Rough Surfaces ◽  
Three Dimensional ◽  
Computer Models ◽  
Contact Analysis ◽  
Solid Model ◽  
Fractal Surfaces ◽  
Contact Conductivity ◽  
Surface Contact

The geometric topography of the engineering surfaces play key roles in many issue of engineering and science including the analysis of friction, wear, lubrication, sealing and contact conductivity, especially microcosmic surface contact, thus the characterization of surface is one of the most important topics of tribology. Using the technology of CAD/CAE, a three-dimensional solid model of the fractal surfaces was established and meshed to provide the computer models for microcosmic contact analysis between two rough surfaces in this paper.

A Reconstruction and Contact Analysis Method of Three-Dimensional Rough Surface Based on Ellipsoidal Asperity

2020 ◽  
Vol 142 (4) ◽  
Author(s):  
Yuqin Wen ◽  
Jinyuan Tang ◽  
Wei Zhou ◽  
Lin Li
Keyword(s):  
Rough Surface ◽  
Rough Surfaces ◽  
Minimum Mean Square Error ◽  
Three Dimensional ◽  
Contact Fatigue ◽  
Contact Analysis ◽  
Analysis Method ◽  
Surface Asperity ◽  
Surface Contact ◽  
Rough Surface Contact

Abstract The 3D rough surface modeling and contact analysis is a difficult problem in the study of rough surface contact. In this paper, a new method for reconstruction and contact analysis of asperities on 3D rough surfaces is proposed based on real rough surfaces. Watershed algorithm is used to segment and determine the area of asperities on the rough surface. According to the principle of minimum mean square error, ellipsoid fitting is carried out on asperities. Based on the elastic-plastic contact model of a single ellipsoidal asperity, a stable and efficient method for 3D rough surface contact analysis and calculation is proposed. Compared with existing calculating methods, the present method has the following characteristics: (1) the constructed surface asperity is closer to the real asperity in contact, and the calculation of asperity parameters has better stability under different sampling intervals and (2) the contact pressure, contact area, and other contact parameters of the 3D rough surface are calculated with high accuracy and efficiency, and the calculation convergence is desirable. The reconstruction and contact analysis method of the 3D rough surface asperity proposed in this paper provides a more accurate reconstruction and calculation method for the study of contact fatigue life and wear failure of rough surfaces.

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