boundary lubrication


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boundary lubrication

a coating of a thin layer of molecules on each weight-bearing surface of a joint to facilitate a sliding action by the opposing bone surfaces.
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This domain is termed the boundary lubrication regime.
According to the differences of generation mechanisms of the transmitted torque and axial load [9], the engagement of wet clutch is divided into three stages: squeezing fluid stage, boundary lubrication stage, and asperity contact stage.
According to molecular mechanics theory of friction, the total friction force under boundary lubrication can be resolved into an adhesion component and a deformation component.
These components are designed to impart a variety of desirable properties including balanced lubricity, boundary lubrication, static protection, and permanent surface modification.
The need for improved lubricating technologies is critical when trying to solve tribological problems concerning dry friction or boundary lubrication under high temperatures.
Other topics include characterizing solid surfaces, adhesion, interface temperatures of sliding surfaces, fluid film lubrication, boundary lubrication and lubricants, friction and wear screening test methods, and components and applications.
b) Where boundary lubrication cannot be avoided, boundary friction should be reduced as much as possible through the use of lubricant additives or other methods, such as low friction coatings.
Research carried out when lubricating with oxidized sunflower oil under boundary lubrication conditions has shown that the increasing amount of hydroperoxides reduces reduction properties of oil wear (Fox, Stachowiak 2003).
This investigation shows that free fatty acids ensure good lubrication at boundary lubrication conditions.
These had roughened--they were a lot rougher than they should have been which indicated essentially that they weren't operating under fluid film lubrication, but they were actually in the boundary lubrication regime.
1989) studied boundary lubrication considering ploughing effects; they demonstrated that undulated titanium surfaces would considerably reduce friction coefficient and wear.
Contributors describe the measuring techniques and theoretical modeling used in TFL research, and explain the mechanisms for boundary lubrication and friction, gas lubrication in nano-gaps and mixed lubrication at the micro-scale.