Journal
STRUCTURAL HEALTH MONITORING-AN INTERNATIONAL JOURNAL
Volume 21, Issue 2, Pages 424-437Publisher
SAGE PUBLICATIONS LTD
DOI: 10.1177/14759217211002562
Keywords
Composites; non-destructive testing; nonlinearity; elastic wave modulation; bandpower; scanning laser Doppler vibrometry
Funding
- Fonds voor Wetenschappelijk Onderzoek (FWO) [1148018N]
- Bijzonder Onderzoeks Fonds BOF [01N01719]
- SIM (Strategic Initiative Materials in Flanders) [160455]
- VLAIO (Flemish government agency Flanders Innovation AMP
- Entrepreneurship) [160455]
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A non-destructive testing procedure using full wavefield measurement and low-power piezoelectric actuator excitation is proposed for damage detection in composites. Specific nonlinear components are extracted using a time-frequency filtering method, and damage maps are constructed through broadband bandpower calculation, showing high performance for defect detection.
A non-destructive testing procedure is proposed for damage detection in composites using full wavefield measurement obtained using a scanning laser Doppler vibrometer. Vibrations are excited using two low-power piezoelectric actuators leading to nonlinear elastic wave modulation at the defect. One actuator is supplied with a broadband chirp signal and the other actuator is supplied with a single-frequency sine signal. First, a time-frequency filtering method is proposed to extract specific nonlinear components of interest (e.g. second higher harmonic and first modulation sideband) without the need for multiple excitation sequences. Next, damage maps are constructed using broadband bandpower calculation of the filtered nonlinear components. It is demonstrated that the modulation sidebands provide an exclusive imaging of defect nonlinearity, and are not affected by potential source nonlinearity. The proposed damage map construction procedure is applied for various carbon fiber reinforced polymer test specimens with different damage features: (1) coupon with quasi-static indentation damage, (2) coupon with artificial delaminations, (3) bicycle frame with impact damage, and (4) stiffened aircraft panel with partially debonded stiffener. The obtained results indicate the high performance of the developed procedure for detection of various defect types in curved and/or stiffened carbon fiber reinforced polymer components.
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