Téléchargez: himmel-these-2006
Abstract: Physical parameters characterising an elastohydrodynamically lubricated sphère/plane contact are studied by means of in situ Raman microspectrometry using polyphenyl ether (5P4E) as Raman probe and lubricant. Spectroscopic images, also called spectrum images, are acquired point by point in the dynamic contact and are analysed in order to obtain simultaneous high spatial resolution (10¤m) mapping of pressure, lubricant film thickness and temperature in the contact and in its vicinity. For pressure, Raman band shifts of the 5P4E band are extracted from spectrum images and are converted into absolute pressure experienced by the lubricant. After a systematic calibration procedure the Raman band intensity of the lubricant film allows us to deduce the distribution of the film thickness.The Antistokes/Stokes intensity ratio is used to determine the temperature values. The experimental distributions of pressure and lubricant film thickness are compared to the theoretical calculations and are in good agreement.The temperature profiles also agree well with the results of previous works.