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According to conventional thinking, if the wear is due purely
to ‘abrasion’ or ‘attrition’, which are surface processes, then the
volume wear rate should be directly proportional to surface area.
It is therefore natural to express BMAT wear rates in terms of
weight loss per unit surface area, and to expect that for a given
material this quantity will be independent of initial specimen
surface area. This is the approach taken by Albertin and Sinatora
[28]. As mentioned in the above section, our preliminary tests
using the BMAT suggested that this approach was valid, at least
for a fairly tight range of specimen surface areas.
In order to evaluate the validity of this approach, more
detailed experiments have been conducted to examine the effects
of specimen size on wear rate. There was also a concern that,
for a given surface area, specimen shape might have some effect
on wear rate. Accordingly, a heat treated white ir

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