비파괴검사학회지 (Journal of the Korean Society for Nondestructive Testing)

  • 제35권3호
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  • Pages.206-214
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  • 2015
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  • 1225-7842(pISSN)
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  • 2287-402X(eISSN)
한국비파괴검사학회 (The Korean Society for Nondestructive Testing)
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NDE of Low-Velocity Impact Damage in GFRP Using Infrared Thermography Techniques

  • Kim, Ghiseok (Department of Biosystems Engineering, Seoul National University) ;
  • Lee, Kye-Sung (Center for Analytical Instrumentation Development, Korea Basic Science Institute) ;
  • Hur, Hwan (Center for Analytical Instrumentation Development, Korea Basic Science Institute) ;
  • Kim, Sun-Jin (Center for Analytical Instrumentation Development, Korea Basic Science Institute) ;
  • Kim, Geon-Hee (Center for Analytical Instrumentation Development, Korea Basic Science Institute)
  • 투고 : 2015.06.01
  • 심사 : 2015.06.23
  • 발행 : 2015.06.30
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초록

In this study, low-velocity impact damage (LVID) in glass fiber reinforced plastic (GFRP) was investigated using pulse thermography (PT) and lock-in thermography (LIT) techniques. The main objective of this study was to evaluate the detection performance of each technique for LVID in GFRP. Unidirectional and cross-ply GFRPs were prepared with four energy levels using a drop weight impact machine and they were inspected from the impact side, which may be common in actual service conditions. When the impacted side was used for both inspection and thermal loading, results showed that the suggested techniques were able to identify the LVID which is barely visible to the naked eye. However, they also include limitations that depend on the GFRP thickness at the location of the delamination produced by the lowest impact energy of five joule.

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