TEMPERATURE COEFFICIENT OF LINEAR EXPANSION AND YOUNG’S FICTIVE MODULUS OF SELF-SUPPORTING OPTICAL CABLE

Abstract

Based on the method of determining the temperature coefficient of linear expansion and Young's modulus of a dielectric optical cable, the study of the temperature coefficient of linear expansion (TCLR) - α01 and the Young's fictive modulus (E0f) in self-supporting optical cables (SSOC) was carried out in this work. The cable constructions are selected with a central modular tube and with peripheral power elements (РРЕ) based on 12, 18 and 24 aramid threads type “Twaron 1052” (with a linear density of one aramid thread 8050 dtex or 2, 4 and 6 steel wires made of soft steel. These fiber optic cable (OC) structures are similar to OC structures of the Kharkiv Plant «Yuzhcable», ОЦАрП and ОЦП, accordingly. Given the analysis of the obtained results of the specified parameters and the dependence graphs of TCD and the Young's fictive modulus on the number of aramid threads in the ОЦАрП cable and steel wires in ОЦП cable, are plotted. Mentioned studies made it possible to establish that the E0f in the ОЦП cable has a greater value than in the ОЦАрП cable. The latter allows receiving the acceptable tensile force in the ОЦП cable construction more than in the ОЦАрП cable construction. It is recommended to use the obtained values of α01 and E0f for the selected cable constructions by the designers of the fiber-optic communication lines in determining their mechanical strength (specific cable loads and sagging deflection depending on the climatic conditions of the cable route).