Computational and Experimental Determination of the Viscoelastic Parameters of the Dispersed-filled Polymeric Materials

The aim of the study is to describe the two-component polymer composites as a viscoelastic heterogeneous medium. The proposed computational and experimental approach to the determination of effective viscoelastic parameters is based on a statistical method of moment functions and Prony model. The validity of the hypothesis of aliasing relaxation times of the matrix and the filler in the absence of the interfacial layer is established, as well as the use of standardized tests in uniaxial tension-compression at constant temperature in order to determine the parameters of the thermoviscoelasticity equations. To illustrate the proposed approach we determine the viscoelastic parameters of polytetrafluoroethylene, filled with particles of polyethylene terephthalate. By approximating the deformation diagrams in uniaxial tension obtained at different temperatures, we also found the viscoelastic parameters of glass-nylon composite. Temperature independence of the relaxation core dimensionless parameter and the activation energy of the relaxation process is defined