DAMPING CHARACTERISTICS IDENTIFICATION OF SELF-REINFORCED POLY-ETHYLENE TEREPHTHALATE

Damping material characteristics are important to be considered in dynamic numerical simulations in order to obtain accurate results. The dependency between the critical damping fraction and frequency is experimentally determined within this article for a novel thermoplastic composite material - poly-ethylene terephthalate fiber reinforced poly-ethylene terephthalate (SrPET). The article explains the theoretical background used for obtaining the values of damping ratio, A curve fitting process is applied in order to identify the mathematical function that best fit the experimental data. It is shown that the damping ratio varies with frequency by following an exponential function, The influence of material damping characteristic is evidenced through a case study where a flat plate of SrPET is subjected to an impulse unit force. The results indicate, as expected, a high sensitivity to damping data.