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Quantification of defects depth in glass fiber reinforced plastic plate by infrared lock-in thermography

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Abstract

The increasing use of composite materials in various industries has evidenced the need for development of more effective nondestructive evaluation methodologies in order to reduce rejected parts and to optimize production cost. Infrared thermography is a noncontact, fast and reliable non-destructive evaluation technique that has received vast and growing attention for diagnostic and monitoring in the recent years. This paper describes the quantitative analysis of artificial defects in Glass fiber reinforced plastic plate by using Lockin infrared thermography. The experimental analysis was performed at several excitation frequencies to investigate the sample ranging from 2.946 Hz down to 0.019 Hz and the effects of each excitation frequency on defect detachability. The four point method was used in post processing of every pixel of thermal images using the MATLAB programming language. The relationship between the phase contrast with defects depth and area was examined. Finally, phase contrast method was used to calculate the defects depth considering the thermal diffusivity of the material being inspected and the excitation frequency for which the defect becomes visible. The obtained results demonstrated the effectiveness of Lock-in infrared thermography as a powerful measurement technique for the inspection of Glass fiber reinforced plastic structures.

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Author information

Authors and Affiliations

  1. Division of Mechanical Engineering, Kongju National University, Cheonan, 331-717, Korea

    Shrestha Ranjit & Wontae Kim

  2. Safety Measurement Center, Korea Research Institute of Standards and Science, Daejeon, 305-340, Korea

    Manyong Choi

Authors
  1. Shrestha Ranjit
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  2. Manyong Choi
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  3. Wontae Kim
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Corresponding author

Correspondence to Wontae Kim.

Additional information

Ranjit Shrestha is a Ph.D. candidate in Thermal design and infrared laboratory of Kongju National University, Cheonan, Korea. His main research interests include non-destructive testing, infrared thermography, machine vision, image processing, fault diagnosis, modeling & simulation and renewable energy technologies.

Wontae Kim is a professor at Division of Mechanical & Automotive Engineering, Kongju national university, Cheonan, Korea. As a research professor, he has contributed to several publications in the field of infrared imaging. His research interests are focused in nondestructive testing, infrared thermography, energy saving, heat transfer and fluid mechanics.

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Ranjit, S., Choi, M. & Kim, W. Quantification of defects depth in glass fiber reinforced plastic plate by infrared lock-in thermography. J Mech Sci Technol 30, 1111–1118 (2016). https://doi.org/10.1007/s12206-016-0215-5

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  • DOI: https://doi.org/10.1007/s12206-016-0215-5

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