Influence of aramid fabric on fretting wear performance of polyetherimide composite - Polyimides and Other High Temperature Polymers - page 512

Figure 1. Schematic of the SRV Optimol Tester.

K 0 = ∆ V/ d F N

3 3

where, K 0 is the specific wear rate in m ),

F N is applied normal load (N) and d is the total sliding distance (m) which is cal-
culated as 2A ν t, where A is the full oscillation width (m), ν is the frequency (Hz)
and t is the experimental duration (s). Repeatability of the tests was confirmed by
carrying out ten tests on each sample and the readings were within 99.5% confi-
dence level.

/N-m, ∆ V is the loss in wear volume (m

3. RESULTS AND DISCUSSION

Average friction coefficients (µ) as a function of load and temperature are shown
in Fig. 2a and Fig. 2b, respectively. Specific wear rates as a function of load and
temperature are plotted in Fig. 3a and Fig. 3b respectively. SEM of the worn com-
posite surfaces under different conditions are shown in Fig. 4. The following are
the salient features revealed from these studies.
●

Friction co-efficient exhibited by the PEI material was quite high (0.4) and
did not show any variation with fretting time, load and temperature. Friction
co-efficient of the composite, however, showed increase with increase in load
and temperature.