Figure 4.
Three-dimensional (3-D) images of friction surface of the PF friction material at different friction speeds at 0.51 MPa: (a) 3.1 m/s, (b) 7.9 m/s, (c) 15.7 m/s, (d) 23.6 m/s, (e) 31.4 m/s, (f) 47.1 m/s.
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