0.1
0
.0i
0.01
10 100 1000 10000
time (seconds)
Figure AC-1 Elovich numerical model fit to Heimberg et al. data from Figure 3-2.
Numerical fits of the Elovich model expression match the data in Figure AC-1 about as
well as the Langmuir derived closed-form model fit in Figure 3-2. One item of note in
the Elovich derived model is a single value of the removal ratio, X, is used for all of the
sliding speed data. The scope of this work is not discuss merits or the validity one gas-
surface model over another, but rather to see if trends in the frictional data can be
correlated to surface phenomena. The close numerical model fit of the Elovich equation
supports the argument of gas-surface adsorption playing a role in the tribological
performance of NFC films.
oc=0.6 i i I
v = 4.1 E-4 sliding speed (rim/sec)
X= 0.76 V9 mlE10
3