Mechanical characterization of viscous thermo elastic properties of a polymer interlayer by dynamic tests

Experimental analysis of viscoelastic properties of materials is usually carried out with creep tests, relaxation tests (both addressed as transient tests) or periodic tests. The last method permits to perform the analysis of viscoelastic parameters at very short times, representing the effects of fast load conditions, usually hard to highligth by transient experiments. Moreover, experimental results of linear viscoelastic materials can be translated in the space of frequency and temperature, so to achieve information on material behaviour in a time domain wider than the experimental one. Here the first results are reported of an experimental analysis caried out with cyclic tests on composite glass specimens; some of them have been subjected to damage with exposure to solar radiation, moisture and thermal cycles.