Abstract
ABSTRACTInitial results of a novel Raman spectroscopic method for studying fluid lubricant characteristics in a simulated elastohydrodynamic contact are reported. The method uses a Raman microscope which allows spectra to be obtained from a small volume (∼ 0.1 nl) of lubricant entrapped in the elastic deformation formed when a loaded glass plate falls onto a lubricated steel ball. The work described here was undertaken to obtain direct pressure measurements from an entrapped fluid at equilibrium after the initial impact. Our results indicate that pressures in twofold excess of the maximum Hertzian pressure can be generated in ball-plate entrapments of the polyphenyl ether 5P4E. In addition 5P4E has been studied as a pure liquid and as a solution in CCl4 using a diamond anvil cell (DAC). Preliminary results on 2,4-dicyclohexyl-2-methylpentane studied using a DAC and a hydrostatic equilibrium cell are also described.
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