PSI - Issue 66

Anass Gouya et al. / Procedia Structural Integrity 66 (2024) 3–10 Author name / Structural Integrity Procedia 00 (2025) 000–000 All the COF results are summarized in Fig. 5 , which clearly shows that the thickness plays an important role in the time-dependent friction coefficient: 6

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Fig. 5. Medium values after reaching the stable condition.

3.3. Microscopy after abrasion After the abrasion test, we move to the microscopy examination to visualize the effect of friction on the samples that were taken at different locations [18] . To see the abrasive region of the cable [21] , the microscope is focused on the samples damaged areas Fig. 6 , The wear craters observed in this study's optical microscope investigation revealed that PVC abrasion was always the abrasive wear mode Fig 1 . The tests were perforating, and the depth of the crater they left behind was greater than the PVC's thickness. A scanning electron microscope was then used to conduct a thorough investigation, and the look of abrasion of the PVC was noted.

Fig. 6.Microscopy.

3.4. The link from friction coefficient to durability A material's hardness has an impact on how often it abrades. The type of abrasive wear may also have a significant impact on the friction coefficient. Under abrasion circumstances, we attained friction coefficient values of approximately 0.4. [22] The coefficient values found in this study ranged from 0.5 to 0.6. Regarding the samples examined in this paper, the PVC-insulated copper cable had diameters of 0.26-028 and 0.36-0.42. Therefore, it is probably accurate to assume that the friction coefficient's behavior and the appearance of the abrasion wear mode were both influenced by the material's hardness [5] . Indeed, even if statistically speaking, the curves μ = f(t) are various in terms of maximum values ("45 - strand rope": 0.664 and 0.632, respectively, at 0.42mm and 0.36mm in thickness; "7 - strand rope": 0.569 and 0.537, respectively at 0.28 and 0.26 mm in thickness with a constant force of 7 N) this assumption of PVC hardness and may still be appropriate. Thus, in this work Fig. 5 the hardness of the insulator with a change in thickness has a significant influence on the values of the friction coefficient in relation to time. 3.5. Extraction test results Contact stress, which is linked to the wear-strain sites created, plays a significant role in the acceleration of copper cable fatigue. The maintenance, inspection, and cable selection requirements for each application, including