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New b-value parameter for quantitatively monitoring the structural health of carbon fiber-reinforced composites

Cited 14 time in Web of Science Cited 14 time in Scopus
Authors

Jung, Doyun; Yu, Woong-Ryeol; Ahn, Hyunchul; Na, Wonjin

Issue Date
2022-02-15
Publisher
Academic Press
Citation
Mechanical Systems and Signal Processing, Vol.165
Abstract
Carbon fiber-reinforced composites have excellent mechanical properties but are vulnerable to the accumulation of small cracks. This study used acoustic emission (AE) signals to monitor and quantify composite damage. We subjected carbon fiber/epoxy specimens to cyclic loading (10 cycles/step, up to 700 MPa of tensile stress). We obtained AE signals over a wide frequency range that can be used to monitor failure modes. The conventional Ib-value decreased with increasing damage and shifted upward as the propagation distance increased. We introduced a new parameter, the composite b-value (Cb-value), to analyze AE amplitude distribution at the crack origin. It was demonstrated that the Cb-value is independent of sensor location, thus providing accurate information on the overall damage. Finally, a standard value based on the Cb-value was suggested as an index of the damage level in composite materials; this is a useful indicator of structural health.
ISSN
0888-3270
URI
https://hdl.handle.net/10371/179460
DOI
https://doi.org/10.1016/j.ymssp.2021.108328
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College of Engineering/Engineering Practice School (공과대학/대학원)Dept. of Materials Science and Engineering (재료공학부)Journal Papers (저널논문_재료공학부)
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