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Proceedings 2018, 2(8), 406; https://doi.org/10.3390/ICEM18-05273

Investigation to Local Defect Resonance for Non-Destructive Testing of Composites

1
Department of Materials Science and Engineering, Ghent University, Technologiepark-Zwijnaarde 903, 9052 Zwijnaarde, Belgium
2
SIM Program M3 DETECT-IV, Technologiepark-Zwijnaarde 935, B-9052 Zwijnaarde, Belgium
Presented at the 18th International Conference on Experimental Mechanics, Brussels, Belgium, 1–5 July 2018.
*
Author to whom correspondence should be addressed.
Published: 27 May 2018
PDF [732 KB, uploaded 6 June 2018]

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: local defect resonance (LDR); Frequency Band Data (FBD); non-destructive testing (NDT); composite materials; Laser Doppler Vibrometry (LDV) local defect resonance (LDR); Frequency Band Data (FBD); non-destructive testing (NDT); composite materials; Laser Doppler Vibrometry (LDV)
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).
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MDPI and ACS Style

Segers, J.; Kersemans, M.; Verboven, E.; Hedayatrasa, S.; Calderon, J.; Paepegem, W.V. Investigation to Local Defect Resonance for Non-Destructive Testing of Composites. Proceedings 2018, 2, 406.

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