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

  • Do-Hyoung Kim
  • Chung-Hyeon Ryu
  • Sung-Hyun Park
  • Hak-Sung Kim
Regular Paper

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.

Keywords

Non-destructive evaluation Glass fiber reinforced plastic Delamination Failure modes 

Nomenclature

Rs

Reflectance for s-polarized THz wave

Rp

Reflectance for p-polarized THz wave

R

Reflectance for THz wave

T

Transmittance for THz wave

n1

Refractive index of incidence materials

n2

Refractive index of refraction materials

n

Refractive index

θ1

Incidence angle of THz wave

θ2

Refractive angle of the THz wave

A

Absorbance of refraction material

I0

Initial power of THz wave

x

Thickness of specimen

α

Absorption coefficient of refractive materials

ɛr

Relative permittivity of the material

µr

Relative permeability of the material

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Copyright information

© Korean Society for Precision Engineering 2017

Authors and Affiliations

  • Do-Hyoung Kim
    • 1
  • Chung-Hyeon Ryu
    • 1
  • Sung-Hyun Park
    • 1
  • Hak-Sung Kim
    • 1
    • 2
  1. 1.Department of Mechanical Convergence EngineeringHanyang UniversitySeoulSouth Korea
  2. 2.Institute of Nano Science and TechnologyHanyang UniversitySeoulSouth Korea

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