epsilon – pressure-viscosity coefficient (1/Pa).A complete listing of variables can be found at the end of the post. Several variables are used in these formulas. In these contacts the pressure does not get high enough to significantly modify the viscosity, hence the non-dimensional material term is not present in the formulas. Soft EHL contacts have a low modulus material such as a plastic. In these contacts the pressure becomes great enough to cause large changes to the lubricant viscosity. Hard EHL contacts are between high elastic modulus materials such as steel. developed curve fit solutions for EHL contacts based on these variables. ![]() Y – non-dimensional coordinate perpendicular to direction of motion X – non-dimensional coordinate in direction of motion The non-dimensionalization equations are listed below. The dimensional variables are listed below: Hamrock, B.J., Schmid, S.R., Jacobson, B.O., 2004, Fundamentals of Fluid Film Lubrication, Marcel Dekker, New York. The equations found here were taken from Hamrock and colleagues book Fundamentals of Fluid Film Lubrication. ![]() ![]() The solution presented on this page was originally presented by Hamrock and colleagues in a number of papers.
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