Journal of the Korean Society of Safety (한국안전학회지)

The Korean Society of Safety (한국안전학회)
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The Effects of Temperature and Water Absorption on Failure Behaviors of Carbon / Aramid Fiber Composites

온도 및 수분이 탄소/아라미드 섬유 복합재의 파손거동에 미치는 영향

  • Kwon, Woo Deok (Department of Safety Engineering, Pukyong National University) ;
  • Kwon, Oh Heon (Department of Safety Engineering, Pukyong National University) ;
  • Park, Woo Rim (Safety Education Division, Korea Industrial Safety Association)
  • 권우덕 (부경대학교 안전공학과) ;
  • 권오헌 (부경대학교 안전공학과) ;
  • 박우림 (대한산업안전협회 안전교육본부)
  • Received : 2022.05.25
  • Accepted : 2022.07.29
  • Published : 2022.08.31
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Abstract

This paper presents the effects of high temperature and water absorption on the mechanical behaviors of carbon-aramid fiber composites, specifically their strength, elastic modulus, and fracture. These composites are used in industrial structures because of their high specific strength and toughness. Carbon fiber composites are vulnerable to the impact force of external objects despite their excellent properties. Aramid fibers have high elongation and impact absorption capabilities. Accordingly, a hybrid composite with the complementary properties and capabilities of carbon and aramid fibers is fabricated. However, the exposure of aramid fiber to water or heat typically deteriorates its mechanical properties. In view of this, tensile and flexural tests were conducted on a twill woven carbon-aramid fiber hybrid composite to investigate the effects of high temperature and water absorption. Moreover, a multiscale analysis of the stress behavior of the composite's microstructure was implemented. The results show that the elastic modulus of composites subjected to high temperature and water absorption treatments decreased by approximately 22% and 34%, respectively, compared with that of the composite under normal conditions. The crack behavior of the composites was well identified under the specimen conditions.

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References

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