Abstract
Simply generating a high pressure and containing liquid at high pressure is sometimes considered an achievement in itself. Monoblock pressure vessels have been employed to 4GPa. However, to advance the understanding of the behavior of liquids in elastohydrodynamic lubrication (EHL) films, it will be necessary to measure the rheological properties of viscous liquids at the pressures of EHL and this requires that the liquid be placed under known stress and that the resulting motion be detected. Motion must be transferred into the high pressure environment and some measurement of force must be transferred outside. The importance of the use of the smallest possible device is emphasized. These requirements can only be met by the application of some innovative experimental techniques which will be explained in detail in this chapter.
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