Acousto-ultrasonic sensing for delaminated GFRP composites using an embedded FBG sensor

Lam, Pou-Man and Lau, Kin-Tak and Ling, Hang-Yin and Su, Zhong-Qing and Tam, Hwa-Yaw (2009) Acousto-ultrasonic sensing for delaminated GFRP composites using an embedded FBG sensor. Optics and Lasers in Engineering, 47 (10). pp. 1049-1055. ISSN 0143-8166

Abstract

In this paper, an active damage detection system for composite laminates is introduced. A fiber Bragg grating (FBG) was employed as an embedded sensor for detecting ultrasonic Lamb wave generated by a piezoelectric (PZT) actuator, inside the laminates. There were two different configurations for the system, making use of a broadband light source and a laser source, respectively. It was found that the use of a laser source could provide a higher sensitivity, so it was preferred in an ultrasonic signal acquisition unit for damage detection. When a delamination is developed in composite structures, the propagation characteristics of Lamb wave is then changed. According to altered signals, the types and natures of delamination inside the structures can be evaluated. In this experiment, glass fiber-reinforced epoxy (GFRP) composite beams were used to study the feasibility of our proposed detection technique. FBG sensors were embedded in different layers of the composite beams. The responses of FBG sensors from both intact and delaminated composite beams were then compared. Finally, the acquired Lamb wave signals corresponding to different delamination sizes and locations were examined.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Permanent restriction to publshed version due to publisher copyright policy.
Depositing User: epEditor USQ
Faculty / Department / School: Current - USQ Other
Date Deposited: 05 Jul 2011 10:49
Last Modified: 17 Oct 2014 01:52
Uncontrolled Keywords: lamb wave; composite structures; damage detection; delamination; broadband light sources; composite beam; composite laminate; delaminated composite beams; detection technique; embedded FBG; embedded sensors; FBG sensor; Fiber Bragg grating (FBG); GFRP composites; glass fiber-reinforced epoxy; laser sources; propagation characteristics; PZT; ultrasonic lamb waves; ultrasonic sensing; ultrasonic signals
Fields of Research (FOR2008): 09 Engineering > 0906 Electrical and Electronic Engineering > 090609 Signal Processing
09 Engineering > 0905 Civil Engineering > 090503 Construction Materials
09 Engineering > 0912 Materials Engineering > 091202 Composite and Hybrid Materials
Socio-Economic Objective (SEO2008): B Economic Development > 87 Construction > 8703 Construction Materials Performance and Processes > 870399 Construction Materials Performance and Processes not elsewhere classified
Identification Number or DOI: doi: 10.1016/j.optlaseng.2009.01.010
URI: http://eprints.usq.edu.au/id/eprint/18921

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