Composites Research

The Korean Society for Composite Materials (한국복합재료학회)
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Effect to Material Strength Recovery of Stepped Patch Repair with Epoxy based Particle Reinforced GFRP Composites under Hygrothermal Environment

에폭시 기지 입자 강화 GFRP를 사용한 계단형 패치 보수법이 고온 고습 환경하에서 재료의 물성 회복에 미치는 영향

  • Jung, Kyung-Seok (Major of Material Engineering, Graduate School, Korea Maritime and Ocean University) ;
  • Park, Soo-Jeong (Major of Material Engineering, Graduate School, Korea Maritime and Ocean University) ;
  • Kim, Yun-Hae (Department of Ocean Advanced Materials Convergence Engineering, Korea Maritime and Ocean University)
  • Received : 2018.04.09
  • Accepted : 2018.06.09
  • Published : 2018.06.29
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Abstract

In this study, damaged composite laminates were repaired by a stepped patch repair method using halloysite nanotube(HNT) and milled carbon(MC) reinforced composite materials with different amount of the particles. And the mechanical and structural effects of the particles on the interface between the damaged and repair surfaces were analyzed. At this time, after exposing them to a harsh environment of high temperature and humidity for a long time, the recovery rate of the material properties relative to the material forming the damaged plate was compared. As a result, at $70^{\circ}C$ high temperature distilled water, the hygroscopicity of the HNT/GFRP composites was significantly different from that of the MC/GFRP composites. Especially, 0.5, 1 wt. % HNT was added, the moisture absorption rate was the lowest and this was the factor that contributed to the mechanical strength increase. On the other hand, MC showed a high hygroscopic resistance only with a small amount, and the strength was different according to the action direction of the load, and the addition amount was also different.

본 연구에서는 입자크기가 서로 다른 할로이사이트 나노튜브(Halloysite nanotube, HNT)와 밀드 카본(Milled carbon, MC) 강화 복합재료를 사용하여 손상된 복합재료 적층판을 계단형 패치 보수법에 따라 수리하고, 손상된 면과 수리면 사이의 접합 계면에 입자가 미치는 기계적, 구조적 영향을 분석하였다. 이 때, 고온고습의 가혹한 수분 환경에 장시간 노출시켜 손상된 판을 형성하는 기존 재료와의 상대적인 재료 물성 회복률을 비교하였으며 기계적 물성 시험을 통해 성능평가를 실시하였다. 그 결과 $70^{\circ}C$ 고온 증류수에서 HNT는 입자 첨가량에 따라 흡습률이 MC에 비해 뚜렷한 차이를 보였으며 인장강도와 굽힘강도의 경우, 대체적으로 HNT로 강화된 복합재를 사용하여 보수한 시험편이 흡습 전과 후 모두 높은 수치를 나타냈다. 특히, 0.5, 1 wt. %의 HNT가 첨가되었을 때 흡습률이 가장 적었고 이는 기계적 강도 증가에 관여하는 하나의 요인으로 작용하였다. 반면 MC는 소량만으로도 높은 흡습 저항성을 나타냈으며 하중의 방향에 따라 강도의 차이가 발생했다.

Keywords

References

  1. Moon, C.K., Choi, H.L., and Lee, B., "Influence of Moisture Absorption on the Mechanical Properties in the Laminated Composite," Journal of Ocean Engineering and Technology, Vol. 14, No. 3, 2000, pp. 90-99.
  2. Susanna, D.O., Federica, P., Ivana, R., Antonella, P., and Marco, F., "Repair Potential of a Laboratory-processed Nano-hybrid Resin Composite," Journal of Oral Science, Vol. 50, No. 4, 2008, pp. 403-412. https://doi.org/10.2334/josnusd.50.403
  3. Kim, Y.H., Park, C.W., Jung, G.S., and Shin, S.J., "Environment Deterioration Characteristics of Polypropylene/Glass Fiber Composites under Moisture Absorption Environment," Journal of Ocean Engineering and Technology, Vol. 30, No. 6, 2016, pp. 520-525. https://doi.org/10.5574/KSOE.2016.30.6.520
  4. Kong, C.D., Park, H.B., Lim, S.J., and Shin, C.J., "A Study on Compressive Strength of Carbon/epoxy Composite Structure Repaired with Bonded Patches after Impact Damage," Journal of the Korean Society for Composite Materials, Vol. 23, No. 5, 2010, pp. 15-21. https://doi.org/10.7234/kscm.2010.23.5.015
  5. Ahn, S.H., Repair of Composite Laminates, Ph.D Thesis, Stanford University, U.S.A., 1997.
  6. Yoon, S.W., Jung, M.K., Park, Y.B., Kwon, J.H., Choi, J.H., Shin, S.J., Song, M.H., and Song, K.I., "Tensile Strength of Composite Laminates with Various Repairing Methods," The Korean Society for Aeronautical and Space Sciences, Vol. 11, 2011, pp. 96-99.
  7. Lee, J.S., "Applications of Bonded Composite Repair on Aircraft Structural Damage," The Korean Society for Aeronautical and Space Sciences, Vol. 4, 2001, pp. 336-341.
  8. Yoo, J.S., Truong, V.H., Park, M.Y., Choi, J.H., and Kweon, J.H., "Parametric Study on Static and Fatigue Strength Recovery of Scarf-patch-repaired Composite Laminates," Composites Structures, Vol. 140, 2016, pp. 417-432. https://doi.org/10.1016/j.compstruct.2015.12.041
  9. Kim, C.H., Yoo, J.S., Byeon, C.S., Ju, H.W., Park, M.Y., Choi, J.H., and Kweon, J.H., "Failure Characteristics of Scarf Patchrepaired Composite Single-lap Joints," Journal of the Korean Society for Composite Materials, Vol. 29, No. 3, 2018, pp. 177-124.
  10. Kwon, D.J., Wang, Z.J., Choi, J.Y., Shin, P.S., and Park, J.M., "A Study of Damage Sensing and Repairing Effect of CNT Nanocomposites," Journal of the Korean Society for Composite Materials, Vol. 27, No. 6, 2014, pp. 219-224.
  11. Kim, B.A., and Moon, C.K., "Nanoparticle Effect on Durability of Carbon Fiber/Epoxy Composites in Saline Water Environment," Journal of Ocean Engineering and Technology, Vol. 28, No. 1, pp. 64-68. https://doi.org/10.5574/KSOE.2014.28.1.064
  12. Park, S.J., Change of the Structural and Mechanical Properties on Nanocomposites based on Halloysite Nanotubes with the Optimization of Dispersion by Ultrasonic Waves, Master Thesis, Tokushima University, Japan, 2016.
  13. Jung, K.S., A Study on the Mechanical Properties of Glass Fiber Reinforced Composites Repaired by Stepped Patch Method with Particles, Master Thesis, Korea Maritime and Ocean University, Republic of Korea, 2017.