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A Study on the Measurement System Design for the Resin Flow and Curing in the Vacuum Assisted Resin Transfer Molding(VARTM) Process Using the Long Period Fiber Bragg Grating

삽입된 장주기 광섬유 격자를 이용한 VARTM 공정에서의 수지이동 및 변형 과정 예측 시스템 설계에 관한 연구

  • Published : 2004.05.01

Abstract

Long Period Gratings (LPG) is currently receiving considerable attention because of their consistent measuring results fur pressure, temperature, strain and flow. LPG is easier to prepare and has a high sensitivity compared with Fiber Bragg Gratings (FBG). In addition, this kind of optical fiber sensors could be used for implementations in various structures. In this paper, LPG was used to monitor in situ the resin flow and the curing process in VARTM (Vacuum Assisted Resin Transfer. Molding). In order to demonstrate the effectiveness of the method, FBG is inserted into the glass mat to monitor the resin flow using optical spectrum analyzer (OSA). The curing reactions in VARTM are also observed using the same method. From the results, the attenuation wavelength shift and the loss change of attenuation band can be obtained from the status of the RTM (Resin Transfer Molding) sample owing to the internal variations of the .effective index, temperature, and pressure. It is shown that the proposed LPG is more effective in monitoring the curing reaction than FBG.

Keywords

Long Period Gratings(LPG);Fiber Bragg Grating(FBG);Resin Flow;Composite;Vacuum Assisted Resin Transfer Molding(VARTM);Optical Spectrum Analyzer(OSA)

References

  1. D.B.Stegall et al., 1999, 'Leaky Cladding Mode Propagation in Long-Period Fiber Grating Devices,' IEEE PHOTONICS TECHNOLOGY LETTERS, Vol. 11, No.3, 343-345 https://doi.org/10.1109/68.748229
  2. Byeong Ha Lee et al., 1997, 'Displacements of the Resonant Peaks of a Long-Period Fiber Grating Induced by a Change of Ambient Refractive Index,' Opt. Lett., Vol. 22, No. 23, 1769-1771 https://doi.org/10.1364/OL.22.001769
  3. Y.Zhou et al., 1999, 'Dynamic Strain Measurements of a Circular Cylinder in Cross Flow Using a Fibre Bragg Grating Sensor,' Experiments in Fluids, Vol. 37, pp. 359-367 https://doi.org/10.1007/s003480050360
  4. Raman Kashyap, 1999, 'Fiber Bragg Gratings,' pp. 171-178, Academic Press, USA
  5. Sylvia R.M.Kueh et al., 2002, 'A Methodology for Using Long-Period gratings and Mold-Filling Simulations to Minimize the Intrusiveness of Flow Sensors in Liquid Composite Molding,' Composites Science and Technology, Vol. 62, pp. 311-327 https://doi.org/10.1016/S0266-3538(01)00217-2
  6. J.X.Fang et al., 1998, 'Fiber-Optic Fabry-Perot Flow Sensor,' Microwave and Optical Technology Letters, Vol. 18, No. 3, pp. 209-211 https://doi.org/10.1002/(SICI)1098-2760(19980620)18:3<209::AID-MOP14>3.0.CO;2-Z
  7. Se-Won Eun, 2002, 'Experimental Study of the Microvoids Formation and Transport in the Vacuum Assisted Resin Transfer Molding,' Master's thesis of Mechanical Engineering, Seoul National University
  8. Joy P. Dunkers et al., 2001, 'Fiber Optic Flow and Cure Sensing for Liquid Composite Molding,' Optics and Lasers Engineering, Vol. 35, pp. 91-104 https://doi.org/10.1016/S0143-8166(00)00110-X

Cited by

  1. Flow Characteristics of Vacuum Assisted Resin Transfer Molding Process Depending on the Capillary Phenomenon vol.762, pp.1662-9752, 2013, https://doi.org/10.4028/www.scientific.net/MSF.762.612