한국안전학회지 (Journal of the Korean Society of Safety)

  • 제38권3호
  • /
  • Pages.20-26
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  • 2023
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  • 1738-3803(pISSN)
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  • 2383-9953(eISSN)
한국안전학회 (The Korean Society of Safety)
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해수 열화 및 원공 손상 CF/Aramid 복합재의 패치 부착이 굽힘거동에 미치는 영향

The Patch Attachment Effect for Bending Behavior on the CF/Aramid Composites with Seawater Aging and Hole Damage

  • 권우덕 (부경대학교 안전공학과) ;
  • 권오헌 (부경대학교 안전공학과) ;
  • 윤유성 (제이엠 에코(주) 연구소)
  • Woo Deok Kwon (Department of Safety Engineering, Pukyong National University) ;
  • Oh Heon Kwon (Department of Safety Engineering, Pukyong National University) ;
  • Yu Seong Yun (JM Eco Co., Ltd, R&D)
  • 투고 : 2023.04.14
  • 심사 : 2023.06.10
  • 발행 : 2023.06.30
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초록

Fiber-reinforced composite materials with carbon, glass, and aramid fibers are widely applied to industrial field structures due to their excellent properties. However, carbon fibers are vulnerable to external impacts, whereas aramid fibers degrade when exposed to water. This study evaluated carbon/aramid fiber composites degraded and damaged by high-temperature saline environments using acoustic emission (AE). The test specimen was molded using an autoclave and immersed in seawater at 70 ℃ for 224 days. In order to imitate the damage, a 3-mm-diameter hole was drilled using a diamond drill. Additionally, the specimen with the perforation was repaired by patch attachment processing. Three-point bending was used to conduct the flexural experiment, and an AE sensor with a 150-kHz resonance frequency was attached to evaluate the damage and the effect of patch attachment. AE accumulative counts obtained at the maximum load were 69.2, 67.1, and 91.2 for a high-temperature seawater deteriorated condition, a hole specimen, and a repaired patch specimen, respectively. Furthermore, the maximum amplitude of AE was detected at low values of 28 dB, 31.3 dB, and 30.3 dB.

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참고문헌

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