TAILIEUCHUNG - Mechanical Engineering-Tribology In Machine Design Episode 5

Tham khảo tài liệu 'mechanical engineering-tribology in machine design episode 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | Elements of contact mechanics SI . Contact between rough surfaces where y 1 1 and y ranges from at L 5 to at L 100. There are no topographically smooth surfaces in engineering practice. Mica can be cleaved along atomic planes to give an atomically smooth surface and two such surfaces have been used to obtain perfect contact under laboratory conditions. The asperities on the surface of very compliant solids such as soft rubber if sufficiently small may be squashed flat elastically by the contact pressure so that perfect contact is obtained through the nominal contact area. In general however contact between solid surfaces is discontinuous and the real area of contact is a small fraction of the nominal contact area. It is not easy to flatten initially rough surfaces by plastic deformation of the asperities. The majority of real surfaces for example those produced by grinding are not regular the heights and the wavelengths of the surface asperities vary in a random way. A machined surface as produced by a lathe has a regular structure associated with the depth of cut and feed rate but the heights of the ridges will still show some statistical variation. Most manmade surfaces such as those produced by grinding or machining have a pronounced lay which may be modelled to a first approximation by onedimensional roughness. It is not easy to produce wholly isotropic roughness. The usual procedure for experimental purposes is to air-blast a metal surface with a cloud of fine particles in the manner of shot-peening which gives rise to a randomly cratered surface. . Characteristics of random rough surfaces The topographical characteristics of random rough surfaces which are relevant to their behaviour when pressed into contact will now be discussed briefly. Surface texture is usually measured by a profilometer which draws a stylus over a sample length of the surface of the component and reproduces a magnified trace of the surface profile. This is

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