The relation between the friction contact performance and the microgeometry of contacting surfaces

Computer simulation of rough-surface microtopography

“…3 and includes the following components: the input unit of data required to build a computer model (1), com mand buttons for the generation of rough surface model (2) and plotting of the reference curve of the simulated surface (3), visual representation of the seg ment of the generated model of rough surface in the specified scale (4) (partially painted ellipses (circles) refer to the bases of segments of generated MMs; the greater the painted part, the higher the segment), rep resentation of the building of profilograms of models of the specified scale (5), and representation of the plotting of reference curves [11] of the simulated sur face and profilograms removed from it (6). is the relative reference length of the profile on the relative level where p is the level at which chords of surface sectional patterns by the pro file plane are summed up; it is plotted along the ordi nate, and along the abscissa values of are given.…”

“…When simulating a rough surface, beta distributions were used as a random law of the roughness distribu tion by height, as well as to describe their location on the middle surface and the distribution based on the values of radii of their semi axes [5] as follows:…”

“…The use of segments of cylinders, spheres, and ellipsoids as microroughness models most fully corresponds to these requirements [4]. In [5,6], in the case of the simulation of rough surface microtopography, microroughnesses were considered in the form of spherical segments. Their deformations were described using exact and approximate solutions of contact problems.…”

Friction coefficient estimation in shaft/bush interference using finite element model updating

“…It is clear that the friction coefficient can be important and leave a significant impact on the results of the modeling. However, this coefficient is dependent on many parameters like roughness, hardness, operating temperature and other parameters of the contact area of components' materials [6]. If one has to construct the FE model of interference joint without knowledge of the experimental results, a common assumption would be to include a default fixed friction coefficient, which may not be correct.…”

Analysis of the effect of nano-roughness on the friction of a vitreous polymer

“…Sliding friction is therefore one of the most challenging topics in non equilibrium polymer physics and the rheology of confined layers. A large number of studies propose analytical or numerical solutions for contact problems: (i) from single to multiple contacts [2][3][4] on various scales (macro/micro/nano or molecular level [5][6][7][8][9][10]), (ii) from continuous to discrete contacts [11][12][13] or (iii) on elastic or viscoelastic surfaces. This allows one to derive the influence of the contact characteristics on the velocity, load, humidity and physical chemistry of the surfaces.…”