Sliding between clean solid surfaces is generally characterized by a high coefficient of friction and severe wear due to the specific properties of the surfaces, such as low hardness, high surface energy, reactivity, and mutual solubility. Lubrication is very significant in tribological behavior of both non-polymer on polymer and polymer on polymer contacts.It is the process, or technique employed to reduce wear of one or both surfaces in close proximity, and moving relative to each other, by interposing a substance called lubricant between the surfaces to carry or to help carry the load (pressure generated) between the opposing surfaces. The purpose of lubrication is to extend the lifespan of those parts subject to friction, as well as that of the mechanisms and machine parts in which they are involved.
The mechanisms of lubrication can be divided into two main groups, ?uid pressure lubrication and surface ?lm lubrication
Fluid pressure lubrication can be de?ned as the group of lubrication mechanisms where the surfaces are kept apart from each other by ?uid pressure created in the lubricant within the contact. (Is the lubrication regime in which through viscous forces the load is fully supported by the lubricant within the space or gap between the parts in motion relative to one another (the lubricated conjunction) and solid–solid contact is avoided).
المادة المعروضة اعلاه هي مدخل الى المحاضرة المرفوعة بواسطة استاذ(ة) المادة . وقد تبدو لك غير متكاملة . حيث يضع استاذ المادة في بعض الاحيان فقط الجزء الاول من المحاضرة من اجل الاطلاع على ما ستقوم بتحميله لاحقا . في نظام التعليم الالكتروني نوفر هذه الخدمة لكي نبقيك على اطلاع حول محتوى الملف الذي ستقوم بتحميله .
|