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National Repository of Grey Literature 21 records found  beginprevious21 - 21  jump to record: Search took 0.00 seconds. 
Investigation of C/PPS Composites Degradation Process Using Acoustic Measurement
 Fíla, Tomáš ; Valach, Jaroslav ; Kytýř, Daniel ; Šperl, Martin
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.
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National Repository of Grey Literature : 21 records found   beginprevious21 - 21  jump to record:
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