Effect of surfaces similarity on contact resistance of fractal rough surfaces under cyclic loading

Although numerous studies have shown that contact resistance depends significantly on roughness and fractal dimension, it remains elusive how they affect contact resistance between rough surfaces. The interface similarity index is first proposed to describe the similarity of the contact surfaces, which gives a good indication of the actual contact area between surfaces. We reveal that the surfaces’ similarity be an origin of contact resistance variation. The cyclic loading can increase the contact stiffness, and the contact stiffness increases with the increase of the interface similarity index. These findings explain the mechanism of surface roughness and fractal dimension on contact resistance, and also provide reference for the reliability design of the electrical connection.

[1]  G. Proust,et al.  Stress-Dependent Electrical Contact Resistance at Fractal Rough Surfaces , 2017 .

[2]  Stanislav N. Gorb,et al.  Effect of real contact geometry on adhesion , 2006 .

[3]  G. Pharr,et al.  Stiffness of frictional contact of dissimilar elastic solids , 2018 .

[4]  Roman Pohrt,et al.  Normal contact stiffness of elastic solids with fractal rough surfaces for one- and three-dimensional systems. , 2012, Physical review. E, Statistical, nonlinear, and soft matter physics.

[5]  G. Ferro,et al.  Improved Ni/3C-SiC contacts by effective contact area and conductivity increases at the nanoscale , 2009 .

[6]  Shuyun Jiang,et al.  A Contact Stiffness Model of Machined Plane Joint Based on Fractal Theory , 2010 .

[7]  Roman Pohrt,et al.  Normal contact stiffness of elastic solids with fractal rough surfaces. , 2012, Physical review letters.

[8]  Liu Peng,et al.  Research on normal contact stiffness of rough surface considering friction based on fractal theory , 2015 .

[9]  F. Biscarini,et al.  The contact mechanics of fractal surfaces , 2003, Nature materials.

[10]  Fabrizio Scarpa,et al.  Interfacial contact stiffness of fractal rough surfaces , 2017, Scientific Reports.

[11]  Huajian Gao,et al.  Contact stiffness of regularly patterned multi-asperity interfaces , 2018 .

[12]  A Theoretical Contact Mechanics Model of Machine Joint Interfaces Based on Fractal Theory , 2017 .

[13]  G. K. Reeves,et al.  Specific contact resistance using a circular transmission line model , 1980 .

[14]  Xiaodiao Huang,et al.  A complete contact model of a fractal rough surface , 2014 .

[15]  Yixiang Gan,et al.  Interfacial electro-mechanical behaviour at rough surfaces , 2016 .

[16]  M. B. Das,et al.  The effects of contact size and non-zero metal resistance on the determination of specific contact resistance , 1982 .

[17]  Investigation into the mechanical contact behavior of single asperities using static atomistic simulations , 2007 .

[18]  Kyriakos Komvopoulos,et al.  Electrical contact resistance theory for conductive rough surfaces separated by a thin insulating film , 2004 .

[19]  Shirong Ge,et al.  Experimental study on the characterization of worn surface topography with characteristic roughness parameter , 2003 .

[20]  J. Greenwood.  Constriction resistance and the real area of contact , 1966 .