On the necessity of determining the dynamics of development of deformation during mechanical tests under conditions of cable production

Abstract

The analysis of results of comparison of mechanical properties of polyolefin filled with fire retardants is carried out. Experimental data for evaluating the dynamics of the development of uniaxial tensile deformation during standard tests of cable polymer compositions under production conditions are presented. The organization of technological control of ensuring the mechanical strength of structural elements made of halogen-free plastics in a specific production environment is one of the urgent tasks in the manufacture of fire-safe cables. To analyze the dynamics of the development of deformation of halogen-free cable plastics and to determine a practically important quantitative characteristic, it is necessary to study the initial section of the relationship between deformation and time, at which the deformation of the polymer is limited by elastic and viscoelastic deformation. The characteristic dependences of the elongation deformation of the samples on the time of uniaxial tension at a constant rate of separation of the clamps are presented in the process of the standard procedure for determining the mechanical characteristics for halogen-free cable plastics. For all samples, an initial (up to 10 – 15 seconds) linear section is observed with a different growth rate of the total tensile strain.