Smart Structures and Systems

  • 제3권2호
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  • Pages.133-146
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  • 2007
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  • 1738-1584(pISSN)
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  • 1738-1991(eISSN)
테크노프레스 (Techno-Press)
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Broad and stage-based sensing function of HCFRP sensors

  • Wu, Z.S. (Department of Urban & Civil Engineering, Ibaraki University) ;
  • Yang, C.Q. (International Institute for Urban System Engineering, Southeast University)
  • 투고 : 2004.09.22
  • 심사 : 2006.06.22
  • 발행 : 2007.04.25
⟨ 이전 논문 다음 논문 ⟩

초록

This paper addresses a new type of broad and stage-based hybrid carbon fiber reinforced polymer (HCFRP) sensor that is suitable for the sensing of infrastructures. The HCFRP sensors, a type of composite sensor, are fabricated with three types of carbon tows of different strength and moduli. For all of the specimens, the active materials are carbon tows by virtue of their electrical conductivity and piezoresistivity. The measurement principles are based on the micro- and macro-fractures of different types of carbon tows. A series of experiments are carried out to investigate the sensing performances of the HCFRP sensors. The main variables include the stack order and volume fractions of different types of carbon tows. It is shown that the change in electrical resistance is in direct proportion to the strain/load in low strain ranges. However, the fractional change in electrical resistance (${\Delta}R/R_0$) is smaller than 2% prior to the macrofractures of carbon tows. In order to improve the resistance changes, measures are taken that can enhance the values of ${\Delta}R/R_0$ by more than 2 times during low strain ranges. In high strain ranges, the electrical resistance changes markedly with strain/load in a step-wise manner due to the gradual ruptures of different types of carbon tows at different strain amplitudes. The values of ${\Delta}R/R_0$ due to the fracture of high modulus carbon tows are larger than 36%. Thus, it is demonstrated that the HCFRP sensors have a broad and stage-based sensing capability.

키워드

참고문헌

  1. Abry, J. C., Choi, Y. K, Chateauminois, A., Dalloz, B., Giraud, G. and Salvia M. (2001), "In-situ monitoring of damage in CFRP specimens by means of AC and DC measurements", Compo. Sci. Tech., 61, 855-864. https://doi.org/10.1016/S0266-3538(00)00181-0
  2. Ceysson, O., Salvia, M. and Vincent, L. (1996), "Damage mechanism characterization of carbon fiber/epoxy composites by both electrical resistance and acoustic emission analysis", Scripta Materi., 34(8), 1273-1280. https://doi.org/10.1016/1359-6462(95)00638-9
  3. Kupke, M., Schutle, K. and Schuler, R. (2001), "Non-destructive testing of FRP by d.c. and a.c. electrical methods", Compo. Sci. Tech., 61, 837-847. https://doi.org/10.1016/S0266-3538(00)00180-9
  4. Muto, N., Araki, Y., Shin, S. G., Matsubara, H. and Yanagida, H. (2001), "Hybrid composites with selfdiagnosing function for preventing fatal fracture", Compo. Sci. Tech., 61, 875-883. https://doi.org/10.1016/S0266-3538(00)00165-2
  5. Wu, Z. S. and Yang, C. Q. (2004a), "Structural sensing and diagnosis with hybrid carbon fibers", Second International Workshop on Structural Health Monitoring of Innovative Civil Engineering Structures, Manitoba, Canada, September, 3-22.
  6. Wu, Z. S., Yang, C. Q. and Tobe, Y. H. (2003), "Self-diagnosis of concrete beams reinforced with hybrid CFRP rods", F.K Chang (ed.). Proc. of 4th International Workshop on Structural Health Monitoring: Stanford: 155-162.
  7. Wu, Z. S. and Yang, C. Q. (2004b), "Structural health monitoring of hybrid CFRP-strengthened structures", Proc. of the Fifth Korea - Japan Workshop on System Identification and Structural Health Monitoring, Seoul, Korea, Jan. 61-72.
  8. Wu, Z. S., Yang, C. Q. and Harada, T. (2005), "Self-diagnosis of hybrid CFRP sheets-strengthened structures", Smart Mater. Struct., 14, 39-51. https://doi.org/10.1088/0964-1726/14/3/006
  9. Wu, Z. S., Yang, C. Q. and Tobe, Y. H. (2006), "Electrical and mechanical characterizations of hybrid CFRP sheets", J. Compo. Mater., 40(3), 227-244.

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  2. Electrical sensing properties of carbon fiber reinforced plastic strips for detecting low-level strains vol.21, pp.3, 2012, https://doi.org/10.1088/0964-1726/21/3/035013
  3. Static and dynamic measurement of low-level strains with carbon fibers vol.183, 2012, https://doi.org/10.1016/j.sna.2012.06.006
  4. Stabilization of electrical sensing properties of carbon fiber sensors using pre-tensioning approach vol.26, pp.1, 2017, https://doi.org/10.1088/1361-665X/26/1/015012