"P(GA101/98/P226), Z(MSM 262100002)" . "Hartl, Martin" . "0"^^ . "698782" . "26210" . "44" . "0"^^ . "2"^^ . "276"^^ . . "2"^^ . "Li\u0161ka, Miroslav" . . . "RIV/00216305:26210/01:PU20411" . . . "Measurement technique for the study of very thin lubrication films down to one nanometer in a point contact between a steel hall and a transparent disc is used to explore the relationship between central and minimum film thickness and rolling speed at the interface between elastohydrodynamic and boundary lubrication for a series of lubricating fluids. This technique based on the colorimetric interferometry combines powerful film thickness mapping capabilities with high accuracy. It was confirmed that bboth hexadecane and mineral base oil obey the linear relationship between log central and minimum film thickness and log rolling speed predicted by elastohydrodynamic theory down to approximately one nanometer. Conversely, squalane and additive-treated mineral base oil showed film thickness enhancement at slow speeds caused by boundary layers formation within the lubricant film. Obtained experimental data was used for the determination of pressure-viscosity coefficients of test fluids. The measurement t"@en . "2" . "Thin film colorimetric interferometry" . "Measurement technique for the study of very thin lubrication films down to one nanometer in a point contact between a steel hall and a transparent disc is used to explore the relationship between central and minimum film thickness and rolling speed at the interface between elastohydrodynamic and boundary lubrication for a series of lubricating fluids. This technique based on the colorimetric interferometry combines powerful film thickness mapping capabilities with high accuracy. It was confirmed that bboth hexadecane and mineral base oil obey the linear relationship between log central and minimum film thickness and log rolling speed predicted by elastohydrodynamic theory down to approximately one nanometer. Conversely, squalane and additive-treated mineral base oil showed film thickness enhancement at slow speeds caused by boundary layers formation within the lubricant film. Obtained experimental data was used for the determination of pressure-viscosity coefficients of test fluids. The measurement t" . "US - Spojen\u00E9 st\u00E1ty americk\u00E9" . . . . "270-545" . . "Lubrication, Film thickness"@en . . . "Tribology Transactions" . "0569-8197" . "RIV/00216305:26210/01:PU20411!RIV/2002/GA0/262102/N" . "Thin film colorimetric interferometry"@en . . . "[82EEE0940FC5]" . . . . "Thin film colorimetric interferometry" . . "Thin film colorimetric interferometry"@en .