[논문]Terahertz Radiation NDE of Composite Materials for Wind Turbine Applications

Park, Je-Woong; Im, Kwang-Hee; Yang, In-Young; Kim, Sun-Kyu; Kang, Sung-Jun; Cho, Young-Tae; Jung, Jong-An; Hsu, David Kuei

doi:10.1007/s12541-014-0464-0

Terahertz Radiation NDE of Composite Materials for Wind Turbine Applications

International journal of precision engineering and manufacturing, v.15 no.6, 2014년, pp.1247 - 1254

Park, Je-Woong (Department of Naval Architecture and Ocean Engineering, Chosun University) , Im, Kwang-Hee (Department of Automotive Engineering, Woosuk University) , Yang, In-Young (Department of Mechanical Design Engineering, Chosun University) , Kim, Sun-Kyu (Division of Mech. System Engineering, Chonbuk National University) , Kang, Sung-Jun (Division of Mech. System Engineering, Chonbuk National University) , Cho, Young-Tae (Department of Manufacturing Design Engineering, Jeonju University) , Jung, Jong-An (Department of Mechanical and Auto. Engineering, Songwon University) , Hsu, David Kuei (Center for Nondestructive Evaluation, Iowa State University)

Abstract ▼ AI-Helper

Nondestructive testing technique using T-ray (terahertz ray) has received more interest as a new capability tool in engineering application. So, T-ray time-domain spectroscopy was used for inspecting and evaluating physical property and defect characteristics in FRP composite materials for a use of wind energy. First of all, a general refraction mode and transmission mode was utilized for calculating a refractive index (n) based on the well-machined sample. In order to obtain the terahertz ray refractive index, a refractive mode and a transmission mode technique was defined for solving a refractive coefficient (n), with which refractive index of GFRP composites, balsa and epoxy for a use of wind turbine blades could be obtained. A method of wind turbine blade composites having one and two saw-cuts delaminations and some angles/ directions was suggested based on the E-field vector. The time of flight in T-ray using evaluating a T-ray transmission mode agreed with that using T-ray time-domain spectroscopy with the wind turbine blade. Also, in CFRP composites, T-ray propagation is limited because the carbon fibers are blocking the T-ray. Therefore, we have analyzed difference between E-field vector in T-ray and the carbon fiber direction. Also, it was found that a T-ray time domain data in thick GFRP composite laminates seemed to show peaks with a regular spacing (${\Delta}t$) which was obvious with the close relation between TOF and FFT.

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참고문헌 (15)

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Terahertz Radiation NDE of Composite Materials for Wind Turbine Applications

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Terahertz Radiation NDE of Composite Materials for Wind Turbine Applications

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참고문헌 (15)

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박제웅 (37) 임광희 (35) 양인영 (104) 정종안 (8) Hsu, David Kuei (2)

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