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Gas chromatography: A new method of non contact NDE for cure monitoring of carbon-phenolic composites for determination of the gelation region for pressure application

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Abstract

We report the use of gas chromatography as a non contact Non destructive method for online cure monitoring of the carbon-phenolic composites during autoclave curing process to identify the gelation region for pressure application. Experimental trials are made on the laminates prepared by hand lay-up process in autoclave. During curing process methylol-phenol (M-phenol) and water are evolved as reaction by-products and the concentrations of the evolved byproducts are monitored by on-line gas chromatograph connected to autoclave facility. Experimental parameters like sample injection method, sample volume and time of injection have been optimized and M-phenol and water evolution concentrations are monitored as a function of component temperature. M-phenol evolution is more consistent compared to water evolution and therefore based on the falling trend of the methylol phenol concentration a broad region of gelation for pressure application is identified. The region thus identified is further narrowed down based on the diminishing trend of the M-phenol concentration and the experimental analysis of the laminates focusing on resin content and void content. Finally the on-line pressure application criterion was established based on the resin content and void content data.

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References

  1. Duncan Chadwick, Cure monitoring, U.S. Patent 6675112B1, Jan. 2004.

    Google Scholar 

  2. Johnson, D.O., Ultrasonic cure monitoring of advanced composites, U.S. Patent 5009104, April 1991.

    Google Scholar 

  3. Choo, V.K. and Gomez, M.V., Resin cure monitoring, U.S. Patent 5911159, June 1999.

    Google Scholar 

  4. Chen, J.Y., Hoa, S.V., Chen, C.K., and Wang, H., Fiber-optic and ultrasonic measurements for in-situ cure monitoring of graphite/epoxy composites, Journal of Composite Materials, 1999, vol. 33, no. 20, pp. 1860–1881.

    Article  Google Scholar 

  5. Leng, J.S. and Asundi, A., Real-time cure monitoring of smart composite materials using extrinsic Fabry-Perot interferometer and fibre Bragg grating sensors, Smart Materials and Structures, 2002, vol. 11, pp. 249–255.

    Article  Google Scholar 

  6. Stewart, M. and Cain, M., Optical sensor characterization and calibration device for integrated optical systems, NPL Report MATC (A) 57, 2001.

    Google Scholar 

  7. Fitzer, E. and Schafer, W., Carbon, 1970, vol. 8, p. 353.

    Article  Google Scholar 

  8. Nathan, R.P. and Bindu, S., Low temperature ablative heat shield for Re-entry vehicles, Proc. AIAA Thermo Physics Conference, Toronto, Ontario, Canada, 2005.

    Book  Google Scholar 

  9. Torre, L., Kenny, J.M., Boghetich, G., and Maffezzoli, A.M., Degradation behaviour of a composite material for thermal protection systems. Part III. Char characterization, J. Mater Sci., 2000, vol. 35, pp. 4536–4566.

    Article  Google Scholar 

  10. Giddings, J.C., Theory of chromatography in “Chromatography,” in A Laboratory Hand Book, Heftmann, Ed., NY: Van Nostrand Reinhold, 1975.

    Google Scholar 

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Authors and Affiliations

  1. Advanced Systems Laboratory, DRDO, Kanchanbagh, Hyderabad, Andhra Pradesh, 500 058, India

    K. Veera Brahmam & V. Venkateswara Rao

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  1. K. Veera Brahmam
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  2. V. Venkateswara Rao
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Correspondence to K. Veera Brahmam.

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Brahmam, K.V., Rao, V.V. Gas chromatography: A new method of non contact NDE for cure monitoring of carbon-phenolic composites for determination of the gelation region for pressure application. Russ J Nondestruct Test 51, 379–385 (2015). https://doi.org/10.1134/S1061830915060029

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  • DOI: https://doi.org/10.1134/S1061830915060029

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