Evaluation of Residual Strength of CFRP Pressure Vessel After Low Velocity Impact

저속 충격 하중을 받은 탄소섬유강화 복합재 압력용기의 잔류강도 저하 평가

  • Published : 2008.06.30

Abstract

In this paper, the low velocity impact characteristics of filament winding CFRP pressure vessel was investigated using numerical and experimental methods. The cylinder part of CFRP vessel was impacted using triangular shape impactor which simulated the sharp edge of dropping tools and impact response behavior of CFRP was reviewed. The mechanical behavior, such as deformation and stress distribution, were also predicted by explicit finite element method and the validity of the model was investigated. For the quantitative evaluation of the residual strength of the pressure vessel after impact, a series of the ring specimens was cut from the impacted vessel and its burst pressure was measured by hydraulic pressure hoop tension test. As the results, the relationship between the residual strength degradation and the impact energy was successively obtained and a useful methodology to evaluate quantitatively the impact damage tolerance of CFRP pressure vessel was established.

References

  1. C. C. Poe Jr., "Impact Damage and Residual Tension Strength of a Thick Graphite/Epoxy Rocket Motor Case," J. of Spacecraft and Rockets, Vol. 29, No. 3, May-June, 1992, pp. 394-404 https://doi.org/10.2514/3.26364
  2. S. Kobayashi, T. Imai and S Wakayama, "Burst Strength Evaluation of the FW-CFRP Hybrid Composite Pipes Considering Plastic Deformation of the Liner," Composites Part A, Vol. 38, 2007, pp. 1344-1353 https://doi.org/10.1016/j.compositesa.2006.10.011
  3. S. Wakayama, S. Kobayashi, T. Imai and T Matsumoto, "Evaluation of Burst Strength of FW-FRP Composite Pipes After Impact Using Pitch-Based Low-Modulus Carbon Fiber," Composites Part A, Vol. 37, 2006, pp. 2002-2010 https://doi.org/10.1016/j.compositesa.2005.12.010
  4. C. Breen, F. Guild and M. Pavier, "Impact of Thick CFRP Laminates: the Effect of Impact Velocity," Composites Part A, Vol. 36, 2005, pp. 205-211 https://doi.org/10.1016/S1359-835X(04)00153-8
  5. 공창덕, 김영광, 이승현, "탄소/에폭시 복합재 적층판과 강판의 저속충격 거동에 관한 비교 연구," 한국복합재료학회지, 제20권 제5호, 2007, pp. 1-6
  6. 김형원, 윤영주, 나성엽, "Graphite/Epoxy로 만든 두꺼운 관의 저속충격손상에 관한 연구," 한국추진공학회지, 제4권 제2호, 2000, pp. 31-38
  7. S. Abrate, "Impact on Composite Structures," Cambridge University Press, 2005
  8. MSC DYTRAN REFERENCE MANUAL