Abstract
The so called “tear-in” tests were developed to evaluate a correlation between the tear-in of a
grease dam in a tribological system and the lubricity of the grease. They were carried out with
a rheometer as equivalent system and 23 greases. The grease sample was sheared in the
gap between a rotating and a stationary plate with a linearly increasing shear rate. The motion
of the grease within this gap was observed optically with a high-speed camera. In addition,
the shear stress was measured and evaluated. The results of the tear-in tests correlate well
with functional tests using a rotary shaft sealing system.
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