Effect of propagation distance on acoustic emission of carbon fiber/epoxy composites

This study examined the change in acoustic emission as a function of measurement position of fiber-reinforced composites. Single-edge-notched carbon fiber/epoxy composites were prepared and tested under cyclic loading, with sensors located at specific distances from the end of the notch. Although th...

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Bibliographic Details
Published in:Structural health monitoring 2021-11, Vol.20 (6), p.3342-3353
Main Authors: Jung, Doyun, Lee, Byoung-Sun, Yu, Woong-Ryeol, Na, Wonjin
Format: Article
Language:English
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Summary:This study examined the change in acoustic emission as a function of measurement position of fiber-reinforced composites. Single-edge-notched carbon fiber/epoxy composites were prepared and tested under cyclic loading, with sensors located at specific distances from the end of the notch. Although the Ib-value increased overall, the degree of increase significantly varied with position and acoustic emission frequency. Notably, the proportion of acoustic emission signals for each failure mode varied due to a high attenuation rate at high frequencies, which increased the Ib-value. Accordingly, the high-frequency fiber-failure signals significantly affected the Ib-value. This study focused on the importance of analyzing acoustic emission signals by considering the crack location and frequency-dependent attenuation rate. We concluded that an acoustic emission sensor should be located 20–40 mm from the crack location for woven carbon fiber/epoxy composites.
ISSN:1475-9217
1741-3168
DOI:10.1177/1475921720986156