Investigation of C/PPS Composites Degradation Process Using Acoustic Measurement

0360106 - ÚTAM 2012 RIV CZ eng C - Conference Paper (international conference)
Fíla, Tomáš - Valach, Jaroslav - Kytýř, Daniel - Šperl, Martin
Investigation of C/PPS Composites Degradation Process Using Acoustic Measurement.
EAN Proccedings. Brno: Czech Society for Mechanics, 2011 - (Návrat, T.), s. 49-55. ISBN 978-80-214-4275-7.
[Experimental Stress Analysis 2011. Znojmo (CZ), 06.06.2011-09.06.2011]
Institutional research plan: CEZ:AV0Z20710524
Keywords : acoustic measurement * material degradation * natural frequency
OECD category: Composites (including laminates, reinforced plastics, cermets, combined natural and synthetic fibre fabrics

The article deals with assessment of fatigue degradation of C/PPS composites using simple acoustic measurement technique. Changes in natural frequency and attenuation decrement were chosen as indicators of fatigue damage accumulation in the studied composite material. New testing device was developed for acoustic measurement. The experimental setup was designed to chime the specimen by repeatable force of stiff striker exciting a specific natural mode of vibration and to record the acoustic response of the specimen to the impact simultaneously. From the power spectral density of the signal the natural frequency was obtained. Using the same signal, the attenuation decrement was estimated from regression of the its envelope.
Permanent Link: http://hdl.handle.net/11104/0197737