Proceedings of SerbiaTrib '13

Serbian TribologySocietySERBIATRIB ‘1313 th International Conference onTribologyKragujevac, Serbia, 15 – 17 May 2013Faculty of Engineeringin KragujevacROUGHNESS AND TEXTURE CONCEPTS IN TRIBOLOGYN.K. Myhkin 1 , A.Ya. Grigoriev 11 Metal-Polymer Research Institute, Belarus, nkmyshkin@mail.ruAbstract: Current knowledge on scale and spatial organization of engineering surfaces is presented. Mainmethods of surface roughness analysis are discussed. A review of theoretical and practical problems intribology involving concept of rough surface is presented. Critical analysis of rough surface description inthe evolution from 2D to 3D set of parameters is carried out. Advantages and disadvantages of traditionaland modern approaches of surface analysis based on concepts of roughness and texture are discussed.Keywords: surface roughness, roughness parameters, texture, wear surface, debris.1. INTRODUCTIONSurface asperities influence practically all theaspects of solids contact. There are a lot of theoreticaland experimental data on mutual dependence ofroughness and such phenomena as adhesion, contactstiffness, abrasion and many others which occurduring friction and wear [1-3]. It is commonlyaccepted that understanding of friction phenomenais directly connected to analysis of surface structureand its transformation due to wear. So, at presentany friction and wear model is involving surfaceroughness parameters.Traditional concept of rough surface basedmainly on profile parameters is not fully satisfiedmodern trends in tribology. Development of 3Dparameters did not change the situation significantly.Only recently, a new view of surface spatial organizationwas introduced. The concept is knownas texture and it reflects the appearance of distinctivesurface pattern. The current paper presents areview of the problems of rough surfaces analysisin their evolution from statistical height and stepparameters of profiles to dimensionless and scaleinvariant representation of surface texture.2. ROUGHNESS ORIGINThe deviation of a real surface from the ideallysmooth are associated with the action of variousfactors, which can be divided onto structural, technological,and operational ones [4-6]. Their featuresdefine scale and textural properties which form surfacegeometric irregularities and as a result differenttypes of roughness.Structural roughness is inherently connectedwith discrete nature of solids. Having small but finitesizes, the atoms and molecules of solids arelocated within a certain distance from each other. Ifassume that the boundary of solids corresponds tosome constant potential of atomic interaction withthe surrounding phase, it is evident that its reliefhas a periodic nature. Surface image with atomicresolution presented on Figure 1a confirms that.Figure 1. а – AFM image of pyrolytic graphite surface(amplitude of surface deviation 0.43 nm); b – deformationof gold surface structure under effect of surfaceforces [7] (TEM); c – surface of spiral dislocation; d –surface of steel fracture.4 13 th International Conference on Tribology – Serbiatrib’13