Baseline-free defect evaluation of complex-microstructure composites using frequency-dependent ultrasound reflections

Baseline-free defect evaluation of complex-microstructure composites using frequency-dependent ultrasound reflections
Title:
Baseline-free defect evaluation of complex-microstructure composites using frequency-dependent ultrasound reflections
Other Titles:
Composites Part A: Applied Science and Manufacturing
Publication Date:
27 August 2020
Citation:
Abstract:
In this study, baseline-free defect characterization for both flat and ply-drop composites were proposed using frequency dependence of ultrasound reflections. This frequency dependence of ultrasound interaction with delamination and resin layers in composites were investigated through CIVA® simulation and experimental investigation. To extract quantitative data of frequency dependence of ultrasonic reflections in composites with a single test, synchro squeezed wavelet transform was adopted to decompose the acquired wide-band raw signals into narrow-band frequencies. Quantitative analysis concluded that dependence of ultrasound reflections from defects on frequency in composites are affected by wavelength-to-defect ratio, polymer viscoelasticity, frequency-dependent inter-ply reflections and waviness-induced scattering. Considering these factors, our study found that volumetric defect reflections have a unique frequency dependence. This allows volumetric defect identification and characterization in ultrasonic B-scans to be achieved without comparison to a baseline reference. The proposed method shows a promising solution for non-destructive evaluation of multi-layer composites with diverse microstructures.
License type:
http://creativecommons.org/licenses/by-nc-nd/4.0/
Funding Info:
This research is supported by the Science & Engineering Research Council, Agency for Science, Technology and Research, Singapore, under its industry alignment fund - pre-positioning programme (IAF-PP) (Polymer Matrix Composite NDE, Grant No. A19C9a0044), and Foundation Committee of Fundamental and Applied Fundamental Research of Guangdong Province (Grant No. 2019A1515110704).
Description:
Please find the link to the article at the publisher's URL: https://doi.org/10.1016/j.compositesa.2020.106090
ISSN:
1359-835X
Files uploaded:

File Size Format Action
composite-part-a-artc.pdf 3.07 MB PDF Request a copy