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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2.2. Test abrasion How it works: The abrasion resistance test is used to monitor the degradation of the sample-to-cable friction [16] . The sample is subjected to abrasive wear for a specific number of friction cycles. The amount of friction will depend on the type of sample Fig 1 . Abrasion can be measured by visual inspection, and can also be measured by the loss of mass of the sample [17] . An abrasion test is performed using a 1.5 m cable, the end of which is connected to the positive pole of the machine. A negatively charged blade is moved back and forth over the cable with a force of 7 N and a stroke length of 26 mm. It stops automatically when it touches the conductor as soon as the abrasion has worn down the insulation [18] , and the number of cycles needed to reach the conductive part of the cable are measured.

Fig 1. Test abrasion

2.3. Theories of Friction When measuring the frictional qualities in this study [20] , the wire rope's friction torque, which has a measurement precision of ± 0.5 Nm, is a crucial metric to consider. It may be used to determine the friction force (F f ) and the normal or perpendicular force (N), which will lead to the coefficient of friction (COF) being determined. Because of this, it is possible to calculate the coefficient of friction using the COF µ=Ff /N (1: 2.4. Test extraction Traction tests were performed using a traction machine with a capacity of 357 tons for the cable, along with a force sensor of 2 kN for the strands and 3.5 kN for the specimen [19] . These tests were used to assess the major mechanical parameters of the cable and its components (conductor and insulator). Due to the conductor's tiny diameter, the resistance of the conductor was measured by canceling out 10 ± 1 mm of the cable's length in the middle using mandrels that resemble machine hands [13] . An amount of 500 mm of cable must be used for the test to be valid Fig 2 . The traction machine contains a displacement cell and a force cell [8] which is mounted with the upper moorings on the movable crossbar, which moves at a fixed and constant moving speed according to a guide without any play for the machine’s mandrels. Until the specimen breaks, the machine is under the direction of a computer, which enables the digital acquisition of force and displacement data. µ=F f /N (1)