Real-time estimation of delamination occurrence induced by low-velocity impact in composite plates using optical fiber sensing system

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Low-velocity impact is the one of the most critical events to reduce the reliability of composite structures, because it can generate hidden damages such as delamination inside the structures. In order to address this problem, impact monitoring systems have been suggested using various types of built-in sensors. Generally, such impact monitoring systems are consisted of impact localization and damage assessment. In this paper, a methodology of impact-induced delamination assessment was studied using fiber Bragg grating (FBG) sensors. Because of its multiplexing capability, FBG sensors are advantageous of monitoring large areas of target structures. However, it is hard to be applied in impact monitoring systems due to its low sensitivity and narrow bandwidth. In this study, a quantification method of delamination was examined with maintaining the merits of FBG sensors. For the acquisition of impact-generated acoustic emission (AE) signals, the commercial FBG system was adopted with a sampling frequency of 100 kHz. Then, the acquired AE signals during the low-velocity impact fracture tests were analyzed with the wavelet transform (WT) method for measuring the delamination areas due to different energies. Finally, it can be concluded that the quantities of WT detailed portions are linearly correlated with the delamination areas.
Publisher
ELSEVIER SCI LTD
Issue Date
2018-04
Language
English
Article Type
Article
Keywords

WAVE-NUMBER ANALYSIS; SENSOR PLACEMENT; DAMAGE; IDENTIFICATION; LOCALIZATION; NETWORK; SIGNALS

Citation

COMPOSITE STRUCTURES, v.189, pp.455 - 462

ISSN
0263-8223
DOI
10.1016/j.compstruct.2018.01.095
URI
http://hdl.handle.net/10203/241310
Appears in Collection
AE-Journal Papers(저널논문)
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