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134 Investigation to Local Defect Resonance for Non-Destructive Testing of Composites
Joost Segers 1 , Mathias Kersemans 1 , Erik Verboven 1 , Saeid Hedayatrasa 2 , Javier Calderon 1 , Wim Van Paepegem 1
1  Department of Materials Science and Engineering, Ghent University, Technologiepark-Zwijnaarde 903, 9052 Zwijnaarde, Belgium
2  Department of Materials Science and Engineering, Ghent University, Technologiepark-Zwijnaarde 903, 9052 Zwijnaarde, Belgium,SIM Program M3 DETECT-IV, Technologiepark-Zwijnaarde 935, B-9052 Zwijnaarde, Belgium

Published: 27 May 2018 by MDPI AG in The Eighteenth International Conference of Experimental Mechanics in The Eighteenth International Conference of Experimental Mechanics session ICEM 2018
MDPI AG, Volume 2; 10.3390/ICEM18-05273
Abstract:

Local defect resonance (LDR) makes use of high frequency vibrations to get a localized resonant activation of a defective region. In this study, the LDR behavior of carbon fiber reinforced polymer (CFRP) coupons with three different types of damages is investigated using broadband measurements obtained with a scanning laser Doppler vibrometer (SLDV). First, the LDR response of flat bottom holes of different depths and sizes is evaluated using a signal-to-noise ratio. Next, results are obtained for ETFE inserts where the difference between (artificial) delaminations and inserts is outlined. At last, the vibrational response of a CFRP coupon with barely visible impact damage is investigated. This type of damage has a more complex structure, and it is shown that frequency band data (an alternative to the single frequency LDR) performs well in identifying such complex damage.

Keywords: Composite materials, Non-destructive Testing (ndt), Laser Doppler Vibrometry (ldv), Local defect resonance (LDR), Frequency Band Data (FBD)
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