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DISSERTATIONS
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Author: |
Drivakos Nikolaos |
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Title: |
Investigation of reological parameters of liquid lubricants
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Abstract: |
The
determination of reological characteristics of liquid fluids was
conducted using measured values of the friction coefficient. for the
above reason a new two disk test rig has been constructed, able for
measuring the friction coefficient, by measuring the friction force,
the disks temperature field, the contact time percentage, the wear
of the disks and it is capable of performing fatique and scuff
experiments. The results derived from the new test rig were compared
with results from other test rigs and found to be similar. A new
method was developed, for the fast calculation of the mean
temperature of the oil film, using the finite elements method of the
block theory as well as the oil height and is independent of the
reological law of the lubricant. The results were copmared with
other methods and the validity was very high. Using this method in
congunction with measured values of the friction coefficient, the
relationship of the Eyring stress over the mean temperature of the
oil film was derived for the lubricant under investigation. Finally,
from this relationship the friction coefficient was calculated and
was compared with the measured values of the friction coefficient,
for ellipticities from 1 to 12 showing very satisfactory results |
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