Charakterisierung des strukturviskosen Verhaltens von Schmierstoffen durch Kombination von Experiment und EHD-Simulation mithilfe des Carreau-Modells

摘要

In the present work, the fluid friction in the gap between two discs was examined under full fluid film lubrication conditions. The investigation was both experimental and simulative, whereby input variables for the simulative investigation were obtained from the experimental test series. The experimental examination of fluid friction was carried out on the MEGT's twin-disk-machine, whereby the load and slide-to-roll-ratio were varied at constant hydrodynamic velocity and oil inlet temperature. The reference oil FVA-3 was used as lubricant. As a result of the experimental investigation, traction curves are obtained which show the change in the coefficient of friction or the shear stress as a function of the slide-to-roll-ratio. The maximum and critical shear stress can be determined from the measured traction curves. These represent input variables for the simulative determination of friction in the gap.