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Terahertz radiation NDE of composite materials for wind turbine applications

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Abstract

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 (Δt) which was obvious with the close relation between TOF and FFT.

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References

  1. Im, K. H., Lee, K. S., Yang, I. Y., Yang, Y. J., Seo, Y. H., and Hsu, D. K., “Advanced T-ray Nondestructive Evaluation of Defects in FRP Solid Composites” Int. J. Precis. Eng. Manuf., Vol. 14, No. 6, pp. 1093–1098, 2013.

    Article  Google Scholar 

  2. Huber, R., Brodschelm, A., Tauser, F., and Leitenstorfer, A., “Generation and Field-Resolved Detection of Femtosecond Electromagnetic Pulses Tunable up to 41 THz” Applied Physics Letters, Vol. 76, No. 22, pp. 3191–3193, 2000.

    Article  Google Scholar 

  3. Van Rudd, J. and Mittleman, D. M., “Influence of Substrate-Lens Design in Terahertz Time-Domain Spectroscopy” JOSA B, Vol. 19, No. 2, pp. 319–329, 2002.

    Article  Google Scholar 

  4. Bak, C., Gaunaa, M., Andersen, P. B., Buhl, T., Hansen, P., and Clemmensen, K., “Wind Tunnel Test on Airfoil RisøB118 with an Active Trailing Edge Flap” Wind Energy, Vol. 13, No. 23, pp. 207–219, 2010.

    Article  Google Scholar 

  5. Gregory, I. S., Baker, C., Tribe, W. R., Bradley, I. V., Evans, M. J., and et al., “Optimization of Photomixers and Antennas for Continuous-Wave Terahertz Emission” IEEE Journal of Quantum Electronics, Vol. 41, No. 5, pp. 717–728, 2005.

    Article  Google Scholar 

  6. Brown, E., Smith, F., and McIntosh, K., “Coherent MillimeterWave Generation by Heterodyne Conversion in LowTemperatureGrown GaAs Photoconductors” Journal of Applied Physics, Vol. 73, No. 3, pp. 1480–1484, 1993.

    Article  Google Scholar 

  7. Brown, E. R., McIntosh, K. A., Nichols, K. B., and Dennis, C. L., “Photomixing up to 3.8 THz in LowTemperatureGrown GaAs” Applied Physics Letters, Vol. 66, No. 3, pp. 285–287, 1995.

    Article  Google Scholar 

  8. Chakrapani, S. K., Daya, V., Hsu, D. K., Barnard, D. J., and Gross, A., “Characterization of Waviness in Wind Turbine Blades Using Air Coupled Ultrasonics” Review of Progress in Quantitative Nondestructive Evaluation, Vol. 30, pp. 956–962, 2011.

    Google Scholar 

  9. Hsu, D. K., Lee, K. S., Park, J. W., Woo, Y. D., and Im, K. H., “NDE Inspection of Terahertz Waves in Wind Turbine Composites” Int. J. Precis. Eng. Manuf., Vol. 13, No. 7, pp. 1183–1189, 2012.

    Article  Google Scholar 

  10. Schueler, R., Joshi, S. P., and Schulte, K., “Damage Detection in CFRP by Electrical Conductivity Mapping” Composites Science and Technology, Vol. 61, No. 6, pp. 921–930, 2001.

    Article  Google Scholar 

  11. Hsu, D. K., “Characterization of a Graphite/Epoxy Laminate by Electrical Resistivity Measurements” Review of Progress in Quantitative NED, Vol. 4, pp. 1219–1228, 1985.

    Google Scholar 

  12. Park, J. H., Kim, T. W., Yim, H. J., and Lee, K. S., “Characterizations of the Interfacial Energy in Glass/Resin Laminates” Int. J. Precis. Eng. Manuf., Vol. 12, No. 6, pp. 1079–1084, 2011.

    Article  Google Scholar 

  13. Tse, K. W., Moyer, C. A., and Arajs, S., “Electrical Conductivity of Graphite Fiber-Epoxy Resin Composites” Materials Science and Engineering, Vol. 49, No. 1, pp. 41–46, 1981.

    Article  Google Scholar 

  14. Im, K. H. and Hsu, D. K., “Evaluation and Application of T-ray Nondestructive Characterization of FRP Composite Materials” Journal of the Korean Society for Nondestructive Testing, Vol. 30, No. 5, pp. 429–436, 2010.

    Google Scholar 

  15. Dornfeld, D. A., “Moving Towards Green and Sustainable Manufacturing” Int. J. Precis. Eng. Manuf., Vol. 1, No. 1, pp. 63–66, 2014.

    Article  Google Scholar 

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Authors and Affiliations

  1. Department of Naval Architecture and Ocean Engineering, Chosun University, Gwangju, 501-759, South Korea

    Je-Woong Park

  2. Department of Automotive Engineering, Woosuk University, 490 Hujung-ri, Samrae-up, Wanju-kun, Jeonbuk, 565-701, South Korea

    Kwang-Hee Im

  3. Department of Mechanical Design Engineering, Chosun University, Gwangju, 501-759, South Korea

    In-Young Yang

  4. Division of Mech. System Engineering, Chonbuk National University, Jeonju, Jeonbuk, 561-756, South Korea

    Sun-Kyu Kim & Sung-Jun Kang

  5. Department of Manufacturing Design Engineering, Jeonju University, Jeonju, 560-759, South Korea

    Young-Tae Cho

  6. Department of Mechanical and Auto. Engineering, Songwon University, Kwangju, 502-210, South Korea

    Jong-An Jung

  7. Center for Nondestructive Evaluation, Iowa State University, Ames, Iowa, 50011, USA

    David Kuei Hsu

Authors
  1. Je-Woong Park
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  2. Kwang-Hee Im
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  3. In-Young Yang
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  4. Sun-Kyu Kim
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  5. Sung-Jun Kang
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  6. Young-Tae Cho
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  7. Jong-An Jung
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  8. David Kuei Hsu
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Correspondence to Kwang-Hee Im.

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Park, JW., Im, KH., Yang, IY. et al. Terahertz radiation NDE of composite materials for wind turbine applications. Int. J. Precis. Eng. Manuf. 15, 1247–1254 (2014). https://doi.org/10.1007/s12541-014-0464-0

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  • DOI: https://doi.org/10.1007/s12541-014-0464-0

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