Determination of coefficient of friction Page: 4 of 12
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Of importance to the successful design of a nuclear reactor is the accurate
determination of the coefficients of friction for various core materials under antici-
pated service conditions. All parameters which will affect these values must be
investigated. Among the more important parameters to be considered are: (1) the
effect of temperature; (2) atmospheric effects, including high degrees of vacuum;
(3) condition of the mating surfaces; (4) degree of outgassing of test materials;
(5) grain orientation; (6) effect of normal force; and (7) effect of velocity.
A brief survey of the literature shows that Items (1) through (4) listed above
are the more important factors. One laboratory concludes that Item (3) is the most
A series of experiments were undertaken to attempt to clarify reported work
and investigate conditions which have not been reported to date; This required the
design and construction of a reliable test apparatus which would not lose its effec-
tiveness in the extreme conditions imposed by the test parameters. An experimental
program was established to probe the conditions which would be encountered in a
nuclear reactor. These conditions involved high temperatures, ultra-high vacuum, and
interrelated effects such as outgassing of the material following periods of heat appli-
cation. The experiment was designed so that surface condition effects could also be
This is a preliminary report, and any conclusions based on the data obtained
to date must be verified by additional tests.
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Vandergrift, E.F. Determination of coefficient of friction, report, October 16, 1962; Pittsburgh, Pennsylvania. (digital.library.unt.edu/ark:/67531/metadc877877/m1/4/: accessed November 13, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.