TAILIEUCHUNG - Volume 08 - Mechanical Testing and Evaluation Part 6

Tham khảo tài liệu 'volume 08 - mechanical testing and evaluation part 6', kỹ thuật - công nghệ, cơ khí - chế tạo máy phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | . Ritter Ed. Erosion of Ceramic Materials Trans Tech Publications Switzerland also published as Key Engineering Materials Vol 71 1992 Sliding Contact Damage Testing Introduction SURFACE DAMAGE from sliding contact is related to the adhesion of the mating surfaces in contact. Adhesion is a major contributor to sliding resistance friction and can cause loss of material at the surface . wear or surface damage without a loss of material at the surface . galling or scuffing . Adhesion is clearly demonstrated in sliding systems when a shaft seizes in a bearing. The types of surface damage caused by sliding contact include adhesive wear galling and fretting. These three damage mechanisms are all influenced by adhesion of the mating surfaces but these categories also reflect the nature of the surface damage and the type of sliding contact. For example galling is considered a severe form of adhesive wear that occurs when two surfaces slide against each other at relatively low speeds and high loads. Fretting is also a special case of adhesive wear that occurs from oscillatory motion of relatively small amplitude. The third damage type adhesive wear is a little more ambiguous. Often adhesive wear is defined by excluding other forms of wear. For example if no abrasive substances are found if the amplitude of sliding is greater than that in fretting and if the rate of material loss is not governed by the principles of oxidation adhesive wear is said to occur. In most cases however adhesive wear involves a transfer of material from one surface to another. Adhesive wear also occurs typically from the sliding contact of two surfaces where interfaces in contact are made to slide and the locally adhered regions must separate leaving transferred material. Breakout of this transferred material will form additional debris. This separation of material results in a wide range of wear rates depending on the type of contact and the adhesion between the mating surfaces. This .

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