Dielectric Cure Monitoring of Thermosetting Matrix Composites

열경화성 수지 복합재료의 유전 정화 모니터링

  • 김형근 (국방과학연구소 기술-4-4) ;
  • 이대길 (한국과학기술원 기계공학과)
  • Published : 2003.10.30

Abstract

Cure monitoring can be used to improve the quality and productivity of thermosetting resin matrix composite products during their manufacturing process. In this work, the sensitivity of dielectrometry was improved by adequate separation the efforts of sensor and externals on the measured signal. A new algorithm to obtain the degree of cure during dielectric cure monitoring of glass/polyester and glass/epoxy composites was developed by employing a function of both temperature and dissipation factor, in which five cure monitoring parameters were used to calculate the degree of cure. The decreasing pattern of dissipation factor was compared with the relationships between the degree of cure and the resin viscosity. The developed algorithm might be employed for the in situ cure monitoring of thermosetting resin composites.

열경화성 수지 복합재료의 제조과정에서 제품의 품질과 생산성 향상에 필수적인 경화 모니터링 기술을 개발하였다 경화도를 분석하기 위해, 동일한 경화조건에서 유전기법에 의한 소산계수 측정결과와 시차 주사 열분석 방법에 의한 발열량 계측 결과를 비교하였으며, 계측 감도의 향상을 위해 센서부분과 계측선의 영향을 적절히 분리하는 방법을 사용하였다. 유리섬유/폴리에스터 복합재료와 유리섬유/에폭시 복합재료에 대하여 경화과정에서의 경화도 분석을 위한 새로운 경화 모니터링 방법으로 소산계수와 온도를 동시에 고려하였다. 이 때, 소산계수의 변화 경향은 수지 점도의 변화 양상과 비교하여 분석하였다 개발된 경화 모니터링 방법은 다양한 종류의 열경화성 복합재료 경화 모니터링에 사용될 수 있다.

Keywords

References

  1. C. T. Herakovich, Mechanics of fibrous composites, New York, John Wiley & Sons, (1998)
  2. C. Y. M. Tung, and P. J. Dynes, 'Relationship between viscoelestic properties and gelation in thermosetting systems', J. Appl. Polym. Sci., Vol. 27, pp. 569-574, (1982)
  3. S. Yilmaz, W. Wirges, S. Bauer-Cogonea, S. Bauer, R. Cerhard-Multhaupt, F. Michelotti, E. Toussaere, R. Levenson, J. Liang, and J. Zvss, 'Dielectric, piezoelectric, and electro-optic monitoring of the cross-linking process and photoinduced poling of red acid magly', Appl. Phys. Lett., Vol. 70, pp. 568-570, (1997)
  4. M. J. O. Dwyer, G. M. Maistros, S. W. James, R. P. Tatam, and I. K. Partridge, 'Relating the state of cure to the real-time internal strain development in a curing composite using in-fibre bragg gratings and dielectric sensors', Meas. Sci. Technol., Vol. 9, pp. 1153-1158, (1998) https://doi.org/10.1088/0957-0233/9/8/002
  5. S. Bauer-Cogonea. W. Wirges, S. Bauer, R. Gerhard-Multhaupt, J. Liang, and J. Zyss, 'Electrical determination of the degree of cross-linking in a poled non-linear optical polymer', Chem. Phys. Lett., Vol. 262, pp. 663-667, (1996)
  6. D. R. Day, D. D. Shepard, and K. J. Craven, 'In-process end point determination of epoxy resin cure', Proc. 22nd Int. SAMPE Tech. Conf., 724-732, (1990)
  7. J. Mijovic, J. M Kenny, A. Maffezzoli, A. Trivisano, F. Bellucci, and L. Nicolais, 'The principles of dielectric measurements for in situ monitoring of composite processing', Compos. Sci. Technol., Vol. 49, pp. 277-290, (1993)
  8. D. R. Day, T. J. Lewis, H L. Lee, and S. D. Senturia, 'The role of boundary layer capacitance at blocking electrodes in the interpretation of dielectric cure data in adhesives', J. Adhesion, Vol. 18, pp. 73-90, (1985)
  9. J. Mijovic, and C. F. W. Yee, 'Use of complex impedance to monitor the progress of reactions In epoxy/amine model systems', Macro-molecules, Vol. 27, pp. 7287-7293, (1994)
  10. G. M. Maistros, and I. K. Partridge, 'Dielectric monitoring of cure in a commercial carbon-fibre composite', Compos. Sci. Technol., Vol. 53, pp. 355-359, (1995)
  11. R. Casalini, S. Corezzi, A. Livi, G. Levita, and P. A. Rolla, 'Dielectric parameters to monitor the crosslink of epoxy resins', J. Appl. Polym. Sci., Vol. 65, pp. 17-25, (1997)
  12. K. Nixdorf, and G. Busse, 'The dielectric properties of glass-fiber-reinforced epoxy resin during polvmerisation', Compos. Sci. Technol. Vol. 61, pp. 889-894, (2001)
  13. G. M. Maistros, and I. K. Partridge, 'Monitoring autoclave cure in commercial carbon fibre/epoxy composites', Compos. Part B, Vol. 29B, pp. 245-250, (1998)
  14. Y. S. Gal, W. C. Lee, O. H Kwon, N. G. Yoon, K. S. Lhim, J. K. Ahn, and K. J. Park, 'A study on the curing properties of Kevlar/ epoxy prepreg', J. Korean Society for the Composite Materials, Vol. 14, pp. 1-7, (2001)
  15. J. S. Kim, and D. G. Lee, 'On-line cure monitoring and viscosity measurement of carbon fiber epoxy composite materials', J. Mater. Process. Tech., Vol. 37, pp. 405-416, (1993)
  16. J. S. Kim, and D. G. Lee, 'Analysis of dielectric sensors for the cure monitoring of resin matrix composite materials', Sensor. Actuat. B-Chem., Vol. 30, pp. 159-164, (1996)
  17. K. G. Bang, J. W. Kwon, D. G. Lee, and J. W. Lee, 'Measurement of the degree of cure of glass fiber - epoxy composites using dielectrometry', J. Mater. Process. Tech., Vol. 113, pp. 209-214, (2001)