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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1. Introduction Due to its effectiveness, copper cabling is one of the most often used materials in in many industries, and copper cabling covered with polyvinyl chloride (PVC) insulation is chosen for its flexibility, hardness and conductivity, for which a copper cable covered with a PVC insulation is chosen [1] . Electrical cables with flammable insulation materials are widely used in many fields such as automotive, building, renewable energy and networking [2] . Individual wires are wound into strands that are coiled into a cable. During operation, the cables are subjected to cyclic axial and bending loads [3] , which cause microscopic movement of the individual wires against neighboring wires, resulting in fretting corrosion [4] . The interaction of fretting corrosion and cyclic cause in the initiation and propagation of cracks that lead to failure [3] . Fatigue also increases rope failure. Due to its outstanding performance in terms of thermal, mechanical, and electrical qualities, low-smoke flame-retardant polyvinyl chloride (PVC) cable is frequently utilized in the creation of high-voltage cable junctions [5] . The total impact of electrical, temperature, and mechanical variables actually operates to degrade polyvinyl chloride (PVC), reducing the cable joint's breaking strength and impairing the stability of the electrical system [4-5] . In recent investigations on the deterioration in cable junction insulation, the strength of this material's ability to shield the copper strand from corrosion and deterioration was examined [7] . The bending tensile strength of the strand is often ignored in favor of the fatigue strength of a rope system made up of a bundle of strands and anchoring devices, as many engineers believe that the performance of the complete system reflects all of the essential performance of the strand [8] . International standards do not need to measure tensile performance [9] . Due to the small number of studies that have been conducted to date and the lack of knowledge regarding linear tensile performance [3] , this is clearly the case. As a strand bends and shears under the influence of a tensile force, it is challenging to model and analyze the linear tensile behavior of a strand [10] . In this study [11] , the effect of the design variables of a seven-wire copper strand and forty-five high-strength wires with different diameters and pitches was investigated. In the experiment, a more in-depth research was conducted on the variables of our samples, in order to measure the impact. Finally [12] , the necessary material properties for an improved friction performance of the insulation covering the conductor and for the optimum tensile performance of the high resistance copper strand were suggested. 2. Experimental setup and testing 2.1. Samples Design of the equipment This section presents the test apparatus and rope construction. Examining the effectiveness of various cable termination techniques for polyvinyl chloride copper cables of various diameters is the goal of the experimental effort in this research [13] . Essentially, each geometrical and mechanical characteristic could have an impact [11] . For the experiments in this study [14] , a cable consisting of two materials was chosen : the first one is copper (conductor) with a Young's modulus of 120 MPa and a fish coefficient of 0.34 for the copper geometry Table 1 and The second is a copper cover made of PVC (insulator), with the mechanical qualities of 3275 MPa for Young's modulus and a fish coefficient of 0.32. It is composed of two carbons based on 57% salt and 43% ethylene. The data are grouped in Table 1 Table 1. Geometry of the test samples.

Diameter of wire (mm)

Number of wires (mm)

Cable length for abrasion (mm)

Cable length for extraction (mm)

Conductor diameter (mm)

Thickness of insulation (mm)

Wire winding (mm)

Diameter of cable (mm)

Model A Model B Model C

1500 1500 1500

500 500 500

0.7 0.8 1.8

0.247 - 0 .254 0.311- 0 .330 0.260 - 0.280

0.260 0.280 0.360

28 ± 5

1.2 1.3 2.8

7 7

22±5 38±5

45

Model D

1500

500

2.0

0.311 - 0.328

0.420

40 ± 5

3.0

45