A study has been made of the stress distribution in optical quality glass rolling elements operating under conditions of elastohydrodynamic lubrication, and the pressure distribution in the lubricant film has been inferred from interferometric measurements of the distribution of principal stress sum and principal stress difference on the boundary of the contact region. The absolute retardation method of stress analysis which permits these evaluations has been developed and extended to the measurement of steady-state dynamic stresses, for this purpose. The techniques in use are also amenable to use in the analysis of plasto-elastic elastohydrodynamic lubrication problems.
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