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Nondestructive evaluation of hidden damages in glass fiber reinforced plastic by using the terahertz spectroscopy

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Abstract

In this work, the terahertz (THz) spectroscopy system was used for the detecting and evaluation of hidden damages in a glass fiber reinforced plastic (GFRP). The interaction between THz and the GFRP was analyzed including the effects of reflecting, scattering and absorption of THz radiations with respect to the type of hidden damage. Both the transmission and reflective configurations were used to investigate the hidden damages including the delamination, fiber fracture and moisture absorption. Finally, the hidden damages inside of the composite laminates were successfully imaged simultaneously based on the time-domain spectroscopy of THz radiation. Additionally, the moisture absorption damage in the GFRP could be detected by analyzing of the frequency domain spectrum. It is expected that the developed THz nondestructive evaluation (NDE) technique can be widely used to evaluate the health of the composite structures.

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Abbreviations

R s :

Reflectance for s-polarized THz wave

R p :

Reflectance for p-polarized THz wave

R :

Reflectance for THz wave

T :

Transmittance for THz wave

n 1 :

Refractive index of incidence materials

n 2 :

Refractive index of refraction materials

n :

Refractive index

θ 1 :

Incidence angle of THz wave

θ 2 :

Refractive angle of the THz wave

A :

Absorbance of refraction material

I 0 :

Initial power of THz wave

x :

Thickness of specimen

α :

Absorption coefficient of refractive materials

ɛ r :

Relative permittivity of the material

µ r :

Relative permeability of the material

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Authors and Affiliations

  1. Department of Mechanical Convergence Engineering, Hanyang University, 222, Wangsimni-ro, Seongdong-gu, Seoul, 04763, South Korea

    Do-Hyoung Kim, Chung-Hyeon Ryu, Sung-Hyun Park & Hak-Sung Kim

  2. Institute of Nano Science and Technology, Hanyang University, 222, Wangsimni-ro, Seongdong-gu, Seoul, 04763, South Korea

    Hak-Sung Kim

Authors
  1. Do-Hyoung Kim
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  2. Chung-Hyeon Ryu
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  3. Sung-Hyun Park
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  4. Hak-Sung Kim
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Correspondence to Hak-Sung Kim.

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Kim, DH., Ryu, CH., Park, SH. et al. Nondestructive evaluation of hidden damages in glass fiber reinforced plastic by using the terahertz spectroscopy. Int. J. of Precis. Eng. and Manuf.-Green Tech. 4, 211–219 (2017). https://doi.org/10.1007/s40684-017-0026-x

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  • DOI: https://doi.org/10.1007/s40684-017-0026-x

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