한국안전학회지 (Journal of the Korean Society of Safety)

  • 제30권3호
  • /
  • Pages.7-12
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  • 2015
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  • 1738-3803(pISSN)
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  • 2383-9953(eISSN)
한국안전학회 (The Korean Society of Safety)
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CFRP 적층판의 충격손상이 잔류 굽힘 피로강도에 미치는 영향

Influence of Residual Bending Fatigue Strength on Impact Damage of CFRP Composites

  • 양용준 (동강대학교 소방안전관리과) ;
  • 양인영 (조선대학교 기계시스템공학과)
  • Yang, Yong Jun (Department of Fire and Safety Management, Dongkang College) ;
  • Yang, In Young (Department of Mechanical System Engineering, Chosun University)
  • 투고 : 2014.11.13
  • 심사 : 2015.06.23
  • 발행 : 2015.06.30
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초록

CFRP composites are used as primary structural members in various industrial fields because their specific strength and specific stiffness are excellent in comparison to conventional metals. Their usage is expanding to high added-value industrial fields because they are more than 50% lighter than metals, and have excellent heat resistance and wear resistance. However, when CFRP composites suffer impact damage, destruction of fiber and interface delamination occur. This causes an unexpected deterioration of strength, and for this reason it is very difficult to ensure the reliability of the excellent mechanical properties. Therefore, for the destruction mechanism in bending with impact damage, this study investigated the reinforcement data regarding various external loads by identifying the consequential strength deterioration. Specimens were damaged by impact with a steel ball propelled by air pressure. Decrease in bending strength caused by the tension and compression of the impact side, and depending on the lamination direction of fiber and interface inside the specimen. From the bending test it was found that the bending strength reduced when the impact energy increased. Especially in the case of compression on the impact side, as tensile stress occurred at the damage starting point, causing rapid failure and a substantially reduced failure strength.

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참고문헌

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