An Experimental Approach for the Determination of the Mechanical Properties of Base-Excited Polymeric Specimens at Higher Frequency Modes

Structures made of the thermoplastic polymer polyether ether ketone (PEEK) are widely used in dynamically-loaded applications due to their high-temperature resistance and high mechanical properties. To design these dynamic applications, addition well-known stiffness strength properties vibration-damping at given frequencies required. Depending on application, from a few hertz ultrasonic range interest here. characterize frequency-dependent behavior, an experimental approach was chosen applied sample PEEK. The test setup consists piezoelectrically driven base excitation polymeric specimen non-contact measurement velocity as well surface temperature. beam’s bending vibrations were analyzed by means Timoshenko theory determine polymer’s storage modulus. loss factor calculated using half-power bandwidth method. For PEEK considered frequency 1 kHz 16 kHz, modulus between 3.9 GPa 4.2 9 × 10?3 17 determined. parameters, resulting not essentially influenced amplitude excitation, duration or thermal degrad.ation self-heating, but rather slightly clamping force within fixation area.