Jumplike Variation of the Contact Area between Randomly Rough Surfaces

2005 ◽  
Vol 31 (9) ◽  
pp. 735
Author(s):  
A. É. Filippov
2020 ◽  
Vol 69 (1) ◽  
Author(s):  
Anle Wang ◽  
Martin H. Müser

Abstract In this work, we numerically study the elastic contact between isotropic and anisotropic, rigid, randomly rough surfaces and linearly elastic counterfaces as well as the subsequent Reynolds flow through the gap between the two contacting solids. We find the percolation threshold to depend on the fluid flow direction when the Peklenik number indicates anisotropy unless the system size clearly exceeds the roll-off wave length parallel to the easy flow direction. A critical contact area near 0.415 is confirmed. Heuristically corrected effective-medium treatments satisfactorily provide Reynolds fluid flow conductances, e.g., for isotropic roughness, we identify accurate closed-form expressions, which only depend on the mean gap and the relative contact area. Graphic Abstract


1969 ◽  
Vol 45 (1) ◽  
pp. 295-295
Author(s):  
K. E. Hawker ◽  
P. J. Welton

2021 ◽  
Vol 119 (7) ◽  
pp. 071603
Author(s):  
Hong Hu ◽  
Suo Zhao ◽  
Wenshuo Wang ◽  
Yuqi Zhang ◽  
Yu Fu ◽  
...  

2020 ◽  
Vol 143 (7) ◽  
Author(s):  
Lei-Tao Li ◽  
Xuan-Ming Liang ◽  
Yu-Zhe Xing ◽  
Duo Yan ◽  
Gang-Feng Wang

Abstract The measurement of the real contact area between rough surfaces is one of the most challenging problems in contact mechanics and is of importance to understand some physical mechanisms in tribology. Based on the frustrated total internal reflection, a new apparatus is designed to measure the real contact area. For metallic samples with various surface topographies, the relation between normal load and the real contact area is measured. The unloading process is first considered to distinguish the contribution of elasticity and plasticity in contact with rough surfaces. It is found that both elasticity and plasticity are involved throughout the continuous loading process, different from some present understanding and assumptions that they play at different loading stages. A quantitative parameter is proposed to indicate the contribution of plasticity. The present work not only provides an experimental method to measure the real contact area but figures out how elastic and plastic deformation works in contact with rough surfaces.


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