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Publisher DOI: 10.1038/s41598-017-07234-4
Title: Load-separation curves for the contact of self-affine rough surfaces
Language: English
Authors: Papangelo, Antonio 
Hoffmann, Norbert  
Ciavarella, Michele 
Keywords: wavevector;valves;thermal conductance;lubrication
Issue Date: 31-Jul-2017
Source: Scientific reports 1 (7): Art.-Nr. 6900 (2017)
Journal or Series Name: Scientific reports 
Abstract (english): There are two main approximate theories in the contact of rough solids: Greenwood-Williamson asperity theories (GW) and Persson theories. Neither of them has been fully assessed so far with respect to load-separation curves. Focusing on the most important case of low fractal dimension (D f  = 2.2) with extensive numerical studies we find that: (i) Persson's theory describes well the regime of intermediate pressures/contact area, but requires significant corrective factors: the latter depend also on upper wavevector cutoff of the roughness; hence, (ii) Persson's theory does not predict the correct functional dependence on magnification; (iii) asperity theories in the discrete version even neglecting interaction effects are more appropriate in the range of relatively large separations, also to take into consideration of the large scatter in actual realization of the surface.
DOI: 10.15480/882.1803
ISSN: 2045-2322
Institute: Strukturdynamik M-14 
Type: (wissenschaftlicher) Artikel
Funded by: DFG
Project: Reibflächendynamik in Schraubenverbindungen 
License: CC BY 4.0 (Attribution) CC BY 4.0 (Attribution)
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