108
APPENDIX H
NFC-NFC DRY ARGON
The first matrix of tests was a self-mated NFC pair in a dry argon environment. Figure 5-
6 shows the parameters varied in the test matrix as well as steady state friction coefficient
value for each parameter combination. The steady state friction coefficient was
calculated as the average of cycles 375-400 of sliding over the middle third of the
reciprocating path length (to remove reversal locations). The order of the tests run was
randomized. For the repeat tests the average value for the steady state values along with
their standard deviation is reported.
0.3 mm track
normal load [mN]
100 200 300
0 0 runs
l 1 run
7 runs
0.011 0.003
0.6 mm track
normal load [mN]
100 200 300
0 54
1 8
"1 9
:61 n
I U
70 89 106 70 89 106
max contact max contact
pressure [MPa] pressure [MPa]
Test matrix and steady state friction coefficient values for self mated NFC
samples in a dry argon environment.
The variation of the sliding speed, track length, and normal load was used in this matrix
to look for the influence of sample exposure time and removal energy in the pin contact.
Figure 5-6