PSI - Issue 66

Anass Gouya et al. / Procedia Structural Integrity 66 (2024) 3–10 Author name / Structural Integrity Procedia 00 (2025) 000–000

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3.2. Friction test results The development of the COF for various contact insulation thicknesses under dry friction circumstances without impact was examined in this study along with the effects of insulation geometry on friction and wear in abrasion tests Fig. 5 . It is evident that the COF curves fluctuation is consistent throughout all the experiments, as demonstrated in Fig. 3 , for the 45-strand cables with different geometries . The COF first rises quickly at a steady speed as the test duration increases, peaking at roughly 0.664 when a blade exerts a 7 N force on the insulation. However, the maximum COF of approximately 0.569 occurs for the seven-strand cables in the tests we carried out Fig. 4 , and it is observed that the COF crosses as a function of time when increasing the thickness of the insulation is increased. Finally, the COF varies smoothly between 0.537 and 0.569 for the seven-strand cables, and from 0.632 to 0.664 for the 45-strand cables. As a result, the type of insulation and its thickness may be used to separate the evolution of COF for all experiments. Fig. 4 demonstrates the average values derived from the COF for the stability period, which is about 2 to 4 minutes for Models A and B and 2 to 8 minutes for Models C and D Fig. 3 . The COF is nearly constant at 0.48 for Models A and B, and 0.52 for Models C and D over this time. a b

Fig. 3. 45-wires Cables (a) Model D; (b) Model C.

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Fig. 4. 7-wires Cables (a) Model A; (b) Model B.