locations) for the last 500 cycles of sliding. The results of these experiments are
examined for each water vapor pressure in Figure 6-2.
123 Pa (01% RH)
'I 44 *4 .
340
temperature (KI
0.12
0.08-
0.04-
0.00
300
380
2837 Pa (23% RH)
1233 Pa (10% RH)
a) 0.12
4.,
*-
" 0.08
12 0.04
0.041
300 340 380 300 340 380
temperature (K) temperature (K)
Figure 6-2 Steady state friction coefficient values as a function of counterface surface
temperature for a) 123 Pa, b) 1233 Pa, c) 2837 Pa and d) 4933 Pa of water vapor
pressure.
Using the analysis outlined in Chapter 4, uncertainty intervals representing one
standard uncertainty in friction coefficient are included on each data set. One standard
uncertainty interval signifies a 68% confidence level that the true value of friction
coefficient lays within the interval. As outlined in Chapter 4 and from Figure 6-2 it can
be seen that the uncertainty intervals are significant in magnitude in comparison to the
I i 40
temperature (I
{ 4933 Pa (40% RH)
1 I ,
0.00
300