TAILIEUCHUNG - Kinematics and Mechanisms 2008 Part 5

Tham khảo tài liệu 'kinematics and mechanisms 2008 part 5', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | q ricinoleic acid r dry soap s lard t water u rape oil v 3-in-1 oil w octyl alcohol x triolein y 1 lauric acid in paraffin oil Wear Wear is the removal of material from one or both of two solid surfaces in a solid-state contact. It occurs when solid surfaces are in a sliding rolling or impact motion relative to one another. Wear occurs through surface interactions at asperities and components may need replacement after a relatively small amount of material has been removed or if the surface is unduly roughened. In well-designed tribological systems the removal of material is usually a very slow process but it is very steady and continuous. The generation and circulation of wear debris particularly in machine applications where the clearances are small relative to the wear particle size may be more of a problem than the actual amount of wear. Wear includes six principal quite distinct phenomena that have only one thing in common the removal of solid material from rubbing surfaces. These are 1 adhesive 2 abrasive 3 fatigue 4 impact by erosion or percussion 5 corrosive and 6 electrical arc-induced wear Archard 1980 Bhushan et al. 1985a b Bhushan 1990 . Other commonly encountered wear types are fretting and fretting corrosion. These are not distinct mechanisms but rather combinations of the adhesive corrosive and abrasive forms of wear. According to some estimates two-thirds of all wear encountered in industrial situations occurs because of adhesive- and abrasive-wear mechanisms. Of the aforementioned wear mechanisms one or more may be operating in one particular machinery. In many cases wear is initiated by one mechanism and results in other wear mechanisms thereby complicating failure analysis. Adhesive Wear Adhesive wear occurs when two nominally flat solid bodies are in rubbing contact whether lubricated or not. Adhesion or bonding occurs at the asperity contacts on the interface and fragments are pulled off one surface to adhere to the other surface. .

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