Abstract:
The pure squeeze
theory of elastohydrodynamic lubrication in point contacts has
been developed in this paper. Accurate viscosity-pressure
relationship proposed by Roelands is used in the study. The
numerical results show that while a spherical body is dropping
vertically toward a flat surface of a half-infinitive solid
covered with a thin layer of lubricant, it is only in the final
stage of dropping that the squeeze action is significant. In
this stage very high pressure, sometimes being more than 3 GPa,
may be generated in the film, causing a surface concave in the
central region of conjunction. The shape and the depth of this
concave changes little since it fully formed. In the case the
mass of the sphere is small and the dropping height of it is not
large, the high pressure can rebound the sphere before impact so
that to avoid the metal-to－metal contact of the surfaces.
Key words:
Contact Pure squeeze Elastohydrodynamic lubrication
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