Journal
COMPOSITE STRUCTURES
Volume 156, Issue -, Pages 338-347Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.compstruct.2015.09.055
Keywords
Terahertz time-domain spectroscopy; Glass-fiber-reinforced plastic composites; Nondestructive evaluation; Delamination; Multi-delamination
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Funding
- National Research Foundation of Korea (NRF)
- Industrial Strategic Technology Development Program [10052674]
- Ministry of Education [2012R1A6A1029029, 2013M2A2A9043280]
- Ministry of Trade, Industry & Energy (MOTIE, Korea)
- Korea Evaluation Institute of Industrial Technology (KEIT) [10052674] Funding Source: Korea Institute of Science & Technology Information (KISTI), National Science & Technology Information Service (NTIS)
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In this study, a terahertz time-domain spectroscopy (THz-TDS) imaging system was devised to detect hidden multi-delamination in a glass-fiber-reinforced plastic (GFRP) composite laminates. Shapes, thicknesses and locations in the z-direction of each delamination among the overlapped multi-delamination were analyzed considering the interaction between the pulsed THz wave and the GFRP composite. THz wave power and phase were discussed by the analytical calculations and the experimental results with the evaluation of hidden multi-delamination. Then, the THz image results were compared with those of the ultrasound wave inspection method. Finally, hidden multi-delamination in the GFRP composite laminate was successfully detected and imaged using the THz-TDS imaging system, showing that this system can be widely utilized to evaluate the reliability of composite structures as a nondestructive evaluation method. (C) 2015 Elsevier Ltd. All rights reserved.
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