Deformation Behavior of Thin Lubricant Films at Elevated Pressure
Annual rept. 1 Feb 1993-1 Jan 1994
GEORGIA INST OF TECH ATLANTA SCHOOL OFMECHANICAL ENGINEERING
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Significant progress has been made over the past year toward understanding the mechanisms which control friction in concentrated contact. The coefficient of friction in concentrated contact is still often dealt with as a disposable parameter in numerical analyses. Boundary and elastohydrodynamic lubrication have been recognized as separate regimes of concentrated contact lubrication since the EHD solution of Ertel-Grubin. However, the delineation of these regimes is nearly always in practice based on the magnitude of the film thickness relative to surface roughness rather than a transition in friction. It has been observed in boundary lubrication and in some aspects of elastohydrodynamic lubrication that friction is nearly Coulombic in nature - the friction coefficient is only weakly dependent upon load and sliding velocity. In some instances the friction coefficient may be so similar in the boundary and EHD regimes that friction alone does not clearly discriminate the transition from one to the other. These attributes of liquid lubrication would seem enigmatic.
- Lubricants and Hydraulic Fluids
- Fluid Mechanics
- Solid State Physics