Contribution of processing parameters on void content in the vacuum bagging configurations of L-shaped composite laminates



Out-of-autoclave (OoA) curing is a potential solution in achieving good part quality of low void content at economical manufacturing process compared to the autoclave counterpart. However, with the absence of high pressure in the OoA process, removing voids and volatiles depends only on the vacuuming through the bagging system. It was previously highlighted that different bagging configurations may affect the quality of the cured composites, with the issues remained at the curved section of complex laminates, mostly originated from the bagging arrangement itself. This work presents an experimental analysis on the various bagging configurations in a vacuum bagging process of L-shaped composite. Statistical contributions of the polytetrafluoroethylene (PTFE), edge breather and intensifier in eight different bagging configurations on void content of the complex-shaped laminates were quantified. The correlation between the resin mass loss and void formation at the corner regions was also analysed. The results indicated that the PTFE configuration produced higher void content at 9.66%. However, when the VBO and intensifier were included in the bagging setup, the void content achieved minimum values of 4.92 and 4.94%, respectively. Additionally, when both parameters were combined, the bagging configuration further reduced the void content to 3.85% at the curved section of the L-shaped laminate.


Processing parameters Vacuum bagging Void content Complex-shaped laminate 


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  1. 1.
    Joshi SC (2009) Pragmatism in semi-steady modular finite-grid simulation methodology for aerospace composites manufacturing. Simul Model Pract Theory 17(5):839–849CrossRefGoogle Scholar
  2. 2.
    Karlsson KF, Tomas Åström B (1997) Manufacturing and applications of structural sandwich components. Compos a: Appl Sci Manuf 28(2):97–111CrossRefGoogle Scholar
  3. 3.
    Chandrakala K, Vanaja A, Rao R (2009) Storage life studies on RT cure glass-epoxy pre-pregs. J Reinf Plast Compos 28(16):1987–1997CrossRefGoogle Scholar
  4. 4.
    Hubert P, Poursartip A (2001) Aspects of the compaction of composite angle laminates: an experimental investigation. J Compos Mater 35(1):2–26CrossRefGoogle Scholar
  5. 5.
    Li Y, Li M, Zhang Z, Gu Y (2009) Numerical analysis of parametric effects on consolidation of angle-bended composite laminates. Polym Compos 30(10):1510–1516CrossRefGoogle Scholar
  6. 6.
    Wang X, Zhang Z, Xie F, Li M, Dai D, Wang F (2009) Correlated rules between complex structure of composite components and manufacturing defects in autoclave molding technology. J Reinf Plast Compos 28(22):2791–2803CrossRefGoogle Scholar
  7. 7.
    Hanafiah NM (2014) Study of processing parameters in manufacturing of flat glass- epoxy composite laminates using vacuum bagging oven curing. Universiti Sains Malaysia, Malaysia, MSc thesisGoogle Scholar
  8. 8.
    Kratz J (2009) Processing composite sandwich structures using out-of-autoclave technology. McGill University, MSc thesisGoogle Scholar
  9. 9.
    Kratz J, Hubert P (2013) Anisotropic air permeability in out-of-autoclave prepregs: effect on honeycomb panel evacuation prior to cure. Compos a: Appl Sci Manuf 49:179–119CrossRefGoogle Scholar
  10. 10.
    Hubert P (1996). Aspects of flow and compaction of laminated composite shapes during cure. PhD thesis. University of British Columbia.Google Scholar
  11. 11.
    Lynch K, Hubert P, Poursartip A (1999) Use of a simple, inexpensive pressure sensor to measure hydrostatic resin pressure during processing of composite laminates. Polym Compos 20(4):581–593CrossRefGoogle Scholar
  12. 12.
    Xin C, Gu Y, Li M, Li Y, Zhang Z (2011) Online monitoring and analysis of resin pressure inside composite laminate during zero-bleeding autoclave process. Polym Compos 32(2):314–323CrossRefGoogle Scholar
  13. 13.
    Xin C, Li M, Gu Y, Luo J, Zhang Z (2011) Study on the resin flow and fiber compaction of tapered composite laminates during autoclave processing. J Reinf Plast Compos 30:1399–1411CrossRefGoogle Scholar
  14. 14.
    Eom Y, Boogh L, Michaud V, Sunderland P, Månson JA (2001) Stress-initiated void formation during cure of a three-dimensionally constrained thermoset resin. Polym Eng Sci 41(3):492–503CrossRefGoogle Scholar
  15. 15.
    Radford DW (1995) Volume fraction gradient induced warpage in curved composite plates. Compos Eng 5:923–934CrossRefGoogle Scholar
  16. 16.
    Brillant M (2010) Out-of-autoclave manufacturing of complex shaped composite laminates. McGill University, MSc thesisGoogle Scholar
  17. 17.
    Brillant M, Hubert P (2010). Out-of-autoclave processing of complex shape laminates. Proceedings of 54th International SAMPE Symposium and Exhibition Seattle, WA, 1-15.Google Scholar
  18. 18.
    Kim G-H, Choi J-H, Kweon J-H (2010) Manufacture and performance evaluation of the composite hat-stiffened panel. Compos Struct 92(9):2276–2284CrossRefGoogle Scholar
  19. 19.
    Xin C, Gu Y, Li M, Luo J, Li Y, Zhang Z (2011) Experimental and numerical study on the effect of rubber mold configuration on the compaction of composite angle laminates during autoclave processing. Compos a: Appl Sci Manuf 42(10):1353–1360CrossRefGoogle Scholar
  20. 20.
    Fernlund G, Griffith J, Courdji R, Poursartip A (2002) Experimental and numerical study of the effect of caul-sheets on corner thinning of composite laminates. Composites Part A: Applied Science and Manufacturing 33(3):411–426CrossRefGoogle Scholar
  21. 21.
    Hassan M, Othman AR, Abdullah J, Mahmud AS (2016) Effect of bagging configurations on vacuum bagging only-oven cured to the thickness variations for the complex-shaped laminate composite. J Sci Res Dev 3(3):41–46Google Scholar
  22. 22.
    Hassan M, Othman AR, Kamaruddin S (2013) Void content determination of fiber reinforced polymers by acid digestion method. Adv Mater res 795:64–68CrossRefGoogle Scholar
  23. 23.
    Wang X, Xie F, Li M, Zhang Z (2010) Influence of tool assembly schemes and integral molding technologies on compaction of T-stiffened skins in autoclave process. J Reinf Plast Compos 29(9):1311–1322CrossRefGoogle Scholar
  24. 24.
    Othman AR, Daniel C, Kamaruddin S, Bakar EA (2013) Processing of out-of-autoclave monolithic laminate—effect of PTFE (polytetrafluoroethylene) release film on surface void reduction. Regional Conference on Mechanical and Aerospace Technology, BangkokGoogle Scholar

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© Springer-Verlag London 2017

Authors and Affiliations

  1. 1.School of Mechanical Engineering, Engineering CampusUniversiti Sains MalaysiaNibong TebalMalaysia
  2. 2.Department of Mechanical EngineeringUniversiti Teknologi PetronasSeri IskandarMalaysia

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