Abstract
The following two factors are newly considered in the prediction of friction force between the piston ring-like test piece and the cylinder liner-like test plate on the simulating rig in order to explain the discrepancy between the previous prediction and measurement. (1) The viscous shear force of the oil striation in the cavitated region is included. (2) The transition between the separation boundary condition and Reynolds' is considered, which seems to be caused by an oil film rupture releasing negative pressure. The prediction can be sufficiently improved by considering these two factors for the case of simulating rig. The difference of the ring profile and the effect of oil starvation must be taken into account additionally for the case of piston rings in real engines.
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