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strain

During cabling, mechanical forces acting on a cable

change its geometry. With increasing load, reversible damage occurs in the material at first, as it is in the elastic range; with further increasing loads, the damage becomes irreversible. If cables are subjected to high

loads, e.g. bending

loads, tensile loads, torsion and compression loads

, their characteristic values change and irreversible damage with permanent deformation occurs. At even higher loads, the material can be destroyed and break. These deformations cause the transmission properties of the cable to be affected. As long as the mechanical load is low, i.e. the cable is in the reversible range, it can usually be assumed that no changes will be noticed after the load has been removed; the cable will retain its original properties. Irreversible or destructive deformation always results in severe damage to all properties. If large tensile forces are applied to a cable, the entire cable will become longer and thinner. A thinner cable results in an increase in resistance and an increase in capacitance. Which directly affects the damping and the impedance: Attenuation increases, characteristic imp edance decreases. In modern outdoor cables, tensile loads of up to 6,000 Newton (N) are achieved.

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Englisch: strain
Updated at: 11.11.2020
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Translations: DE