naa a22 4500 510822169 CHVBK 20180411083538.0 cr unu---uuuuu 180411e20130601xx s 000 0 eng 10.1007/s12541-013-0147-2 doi (NATIONALLICENCE)springer-10.1007/s12541-013-0147-2 Advanced T-ray nondestructive evaluation of defects in FRP solid composites [Elektronische Daten] [Kwang-Hee Im, Kil-Sung Lee, In-Young Yang, Yong-Jun Yang, Young-Hwan Seo, David Hsu] Nondestructive testing technique using T-ray (terahertz ray) receives attention these days as a new field of test engineering. In this study, T-ray time-domain spectroscopy was used for inspecting and evaluating physical property and defect characteristics in FRP composite material. Also, general refraction and transmission mode of this T-ray spectrography was used for finding refraction coefficient (n) and for obtaining T-ray image. First, in order to obtain the terahertz ray refraction index, refractive and transmission mode technique was induced, with which refraction index of GFRP composites, balsa and epoxy of wind turbine blade could be obtained. In GFRP and CFRP composites, T-ray propagation faces hindrance by carbon fiber. Accordingly, the authors have analyzed directional dependence between E-field of T-ray and the carbon fiber. Also, evaluating method of wind turbine blade composites having two (2) saw-blade delaminations integrally inserted was presented in this study. It was found that the time of flight of T-ray using T-ray transmission mode technique coincides well with that using refractive index in the wind turbine blade. Korean Society for Precision Engineering and Springer-Verlag Berlin Heidelberg, 2013 NDE nationallicence T-ray nationallicence FRP nationallicence Composites nationallicence Im Kwang-Hee Department of Automotive Eng., Woosuk University, 490 Hujung-ri, Samrae-up, Wanju-kun, 565-701, Jeonbuk, Korea aut Lee Kil-Sung Wind Energy Division, Human Composites Co. Ltd., 1588 Soryong-dong, 573-879, Gunsan-si, Jeonbuk, Korea aut Yang In-Young Dept. of Mechanical Design Eng., Chosun University, 501-759, Gwangju, Korea aut Yang Yong-Jun Dept. of Mechanical Design Eng., Chosun University, 501-759, Gwangju, Korea aut Seo Young-Hwan Dept. of Physical Education, Chosun University, 501-759, Gwangju, Korea aut Hsu David Center for Nondestructive Evaluation, Iowa State University, 50011, Ames, Iowa, USA aut International Journal of Precision Engineering and Manufacturing Korean Society for Precision Engineering 14/6(2013-06-01), 1093-1098 2234-7593 14:6<1093 2013 14 12541 https://doi.org/10.1007/s12541-013-0147-2 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12541-013-0147-2 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Im Kwang-Hee Department of Automotive Eng., Woosuk University, 490 Hujung-ri, Samrae-up, Wanju-kun, 565-701, Jeonbuk, Korea aut NATIONALLICENCE 700 1- Lee Kil-Sung Wind Energy Division, Human Composites Co. Ltd., 1588 Soryong-dong, 573-879, Gunsan-si, Jeonbuk, Korea aut NATIONALLICENCE 700 1- Yang In-Young Dept. of Mechanical Design Eng., Chosun University, 501-759, Gwangju, Korea aut NATIONALLICENCE 700 1- Yang Yong-Jun Dept. of Mechanical Design Eng., Chosun University, 501-759, Gwangju, Korea aut NATIONALLICENCE 700 1- Seo Young-Hwan Dept. of Physical Education, Chosun University, 501-759, Gwangju, Korea aut NATIONALLICENCE 700 1- Hsu David Center for Nondestructive Evaluation, Iowa State University, 50011, Ames, Iowa, USA aut NATIONALLICENCE 773 0- International Journal of Precision Engineering and Manufacturing Korean Society for Precision Engineering 14/6(2013-06-01), 1093-1098 2234-7593 14:6<1093 2013 14 12541 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer