NDLI: NDE inspection of terahertz waves in wind turbine composites

Content Provider	Springer Nature Link
Author	Hsu, David Kuei Lee, Kil Sung Park, Je Woong Woo, Yong Deuck Im, Kwang Hee
Copyright Year	2012
Abstract	An investigation of terahertz waves was made for the nondestructive evaluation of composite materials and structures in the wind turbine. The modalities of the terahertz radiation used were time domain spectroscopy (TDS) and continuous wave (CW). The composite materials and structures investigated include both non-conducting polymeric composites and conducting carbon fiber composites. Terahertz signals in the TDS mode resembles that of ultrasound; however, unlike ultrasound, a terahertz pulse was able to detect a smaller crack hidden behind a larger crack. This was demonstrated in thick GFRP (glass fiber reinforced plastics) laminates of the wind turbine using saw slots. In carbon composites the penetration of terahertz waves is quite limited and the detection of flaws is strongly affected by the angle between the electric field direction of the terahertz waves and the intervening fiber directions. The structures used in this study included both solid laminates and the parts in the wind turbine. The defects and anomalies investigated by terahertz radiation were foreign material inclusions, simulated disband, delamination and mechanical impact damage. The effectiveness and limitations of terahertz radiation are defined and noted for the NDE of composites.
Starting Page	1183
Ending Page	1189
Page Count	7
File Format	PDF
ISSN	22347593
Journal	International Journal of Precision Engineering and Manufacturing
Volume Number	13
Issue Number	7
e-ISSN	20054602
Language	English
Publisher	Korean Society for Precision Engineering
Publisher Date	2012-07-19
Publisher Place	Springer
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	NDE Terahertz waves Wind turbine Composites Materials Science Industrial and Production Engineering
Content Type	Text
Resource Type	Article
Subject	Industrial and Manufacturing Engineering Mechanical Engineering Electrical and Electronic Engineering

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