PROCESSING PARAMETERS OPTIMIZATION OF VACUUM-BAGGING PREFORMING IN OVEN CURE FOR INTER-LAMINAR SHEAR STRENGTH (ILSS) IN GLASS/EPOXY COMPOSITE LAMINATE
DOI:
https://doi.org/10.11113/aej.v14.21061Keywords:
inter-laminar shear strength, VBO-oven cure, out-of-autoclave, optimization, composite laminatesAbstract
Autoclave had been restricted to immense production expenses and overabundant residual stress. These disadvantages had prompted development on the alternative of out-of-autoclave (OoA) processing. The optimization on vacuum-bagging-only (VBO) pre-forming process in producing high inter-laminar shear strength (ILSS) of composite laminate was proposed. The effects of individual and combined pre-forming parameters of VBO-oven cure processing for the conventional low-cost glass/epoxy composite material towards ILSS of cured laminates were quantified. 20 composite panels were manufactured following the designated parameter combinations based on central composite design in fractional factorial for response surface model. Three factors of vacuum debulk duration, edge breather number of sides and intensifier weight were investigated. For validation, two laminates without additional processing parameters were produced via oven (baseline) and autoclave. ILSS test was conducted based on ASTM D 2344. The interaction between combined parameters was analyzed using analysis of variance (ANOVA). Lowest ILSS was found in laminates where intensifier was absent, while highest ILSS was measured with edge breather, debulk and intensifier at different levels. An optimum combination of 30 minutes debulk, each sides of edge breather and 1kg intensifier were validated to produce laminate with highest ILSS of 38.96 MPa, which was 23.53% higher than baseline laminate.
References
Guillaume, S., Yuri, N., Andrew, M., and Lauren, F. 2020. Towards a digital twin for mitigating void formation during debulking of autoclave composite parts. Engineering Fracture Mechanics. 225.
Daniel, G., Suong, V.H., and Stephen, W.T. 2002. Composite materials design and applications. Florida: CRC Press LLC.
Chinedum, O. M., Danning, L., Meng-Fang, L., Paul, D. L, Kali, B. K., Vijay, K. T., and Hamed, Y.N. 2018. Accelerated microwave curing of fibre-reinforced thermoset polymer composites for structural applications: A review of scientific challenges. Composites Part A: Applied Science and Manufacturing. 115: 88-103.
Kaynak, C., and Akgul, T. 2001. Open mould process. In: Akovali G (ed) Handbook of composite fabrication. United Kingdom: Rapra Technology Ltd. 57-86.
Campbell, F. C. 2004. Manufacturing processes for advanced composites. United Kingdom: Elsevier Advanced Technology.
Hermann, T., Schelte, A., Henke, T., and Kelly, P. A., Bickerton, S. 2020. Non-destructive injectability measurements for fibre preforms and semi-finished textiles. Composites Part A: Applied Science and Manufacturing. 138.
Baghad, A., and Mabrouk, K. E. 2022. The isothermal curing kinetics of a new carbon fiber/epoxy resin and the physical properties of its autoclaved composite laminates. Materials Today: Proceedings. 57: 922-929.
Hassan, M. H., Othman, A. R., and Kamaruddin, S. 2017. A review on the manufacturing defects of complex-shaped laminate in aircraft composite structures. The International Journal of Advanced Manufacturing Technology. 91, 4081–4094.
Dufour, P., Michaud, D. J., Touré, Y., and Dhurjati, P. S. 2004. A partial differential equation model predictive control strategy: application to autoclave composite processing. Computers & Chemical Engineering. 28: 545-556.
Sarah, G. K. S, Timotei, C., and Steven, N. 2020. Effects of resin distribution patterns on through-thickness air removal in vacuum-bag-only prepregs. Composites Part A: Applied Science and Manufacturing. 130.
Crump, D. A., Dulieu-Barton, J. M., and Savage, J. 2010. The manufacturing procedure for aerospace secondary sandwich structure panels. Journal of Sandwich Structures & Materials. 12: 421–447.
James, K., and Pascal, H. 2015. Vacuum bag only co-bonding prepreg skins to aramid honeycomb core. Part I. Model and material properties for core pressure during processing. Composites Part A: Applied Science and Manufacturing. 72: 228–238.
James, K., and Pascal, H. 2015. Vacuum bag only co-bonding prepreg skins to aramid honeycomb core. Part II. In-situ core pressure response using embedded sensors. Composites Part A: Applied Science and Manufacturing. 72: 219–227.
Aparicio, I. E., Fishpool, D. T., Diaz, V. R., and Dorey, R. A., and Yeomans, J. A. 2022. Evaluation of polymer matrix composite manufacturing routes for production of an oxide/oxide ceramic matrix composite. Journal of the European Ceramic Society. 42.
Wilson, C., Currens, E., and Rakow, J. 2016. Void content in out-of-autoclave manufacturing processes. Microscopy and Microanalysis. 22: 1832-1833.
Tavares, S. S., Caillet-Bois, N., Michaud, V., and Månson, J. A. E. 2010. Non-autoclave processing of honeycomb sandwich structures: Skin through thickness air permeability during cure. Composites Part A: Applied Science and Manufacturing. 41: 646-652.
Yang, X., Zhan, L., Jiang, C., Zhao, X., Guan, C., and Chang, T. 2019. Evaluating random vibration assisted vacuum processing of carbon/epoxy composites in terms of interlaminar shear strength and porosity. Journal of Composite Materials. 53: 2367-2376.
Torres, J. J., Simmons, M., Sket, F., and González, C. 2019. An analysis of void formation mechanisms in out-of-autoclave prepregs by means of X-ray computed tomography. Composites Part A: Applied Science and Manufacturing. 117: 230-242.
Dong, A., Zhao, Y., Zhao, X., and Yu, Q. 2018. Cure cycle optimization of rapidly cured out-of-autoclave composites. Materials. 11: 1-15.
Krumenacker, N., Madra, A., and Hubert, P. 2020. Image-based characterization of fibre waviness in a representative vacuum-bagged corner laminate. Composites Part A: Applied Science and Manufacturing. 13.
Hubert, P., and Poursartip, A. 2001. Aspects of the compaction of composite angle laminates: an experimental investigation. Journal of Composite Materials. 35: 2-26.
Nisrin, A., and Steven, L. D. 2018. Comparison of methods for the characterization of voids in glass fiber composites. Journal of Composite Materials. 52: 487–501.
Kratz, J., and Hubert, P. 2013. Anisotropic air permeability in out-of-autoclave prepregs: effect on honeycmb panel evacuation prior to cure. Composites Part A: Applied Science and Manufacturing. 49: 179-191.
Davies, L., Day, R., Bond, D., Nesbitt, A., Ellis, J., and Gardon, E. 2007. Effect of cure cycle heat transfer rates on the physical and mechanical properties of an epoxy matrix composite. Composites Science and Technology. 67: 1892-1899.
Liu, D. S-C., and Hubert, P. 2021. Bulk factor characterization of heated debulked autoclave and out-of-autoclave carbon fibre prepregs. Composites Part B: Engineering. 219.
Xin, C., Li, M., Gu, Y., Li, Y., and Zhang, Z. 2011. Measurement and analysis on in-plane and through-thickness air permeation of fiber/resin prepreg. Journal of Reinforced Plastics and Composites. 30: 1467-1479.
Kratz, J. 2009. Processing composite sandwich structures using outofautoclave technology. Dissertation, Department of Mechanical Engineering. McGill University, Montreal.
Cauberghs, J., and Hubert, P. 2011. Effect of tight corners and ply terminations on quality in out-of-autoclave parts. Proceedings SAMPE. 1-15.
Hu, W., and Nutt, S. 2020. Effects of debulk temperature on air evacuation during vacuum bag-only prepreg processing. Advanced Manufacturing: Polymer & Composites Science. 6: 38-47.
Zhang, D., Heider, D., and Gillespie, J. W. 2017. Void reduction of high-performance thermoplastic composites via oven vacuum bag processing. Journal of Composite Materials. 51: 4219-4230.
Brillant, M., and Hubert, P. 2011. Modelling and characterization of thickness variations in L-shape out-of- autoclave laminates. CCM International Conferences on Composite Materials. 1-15.
Judd N. C. W., and Wright, W. W. 1978. Voids and Their Effects on the Mechanical Properties of Composites-An Appraisal. SAMPE Journal. 14(1): 10-14.
Zhu, H. Y., Li, D. H., Zhang, D. X., Wu, B. C., and Chen, Y. Y. 2009. Influence of voids on interlaminar shear strength of carbon/epoxy fabric laminates. Transactions of Nonferrous Metals Society of China. 19: 470-475.
Wisnom, M. R., Reynolds, T., and Gwilliam, N. 1996. Reduction in interlaminar shear strength by discrete and distributed voids. Composites Science and Technology. 56.
Nigel, A. S. J., and Brown, J. R. 1998. Flexural and interlaminar shear properties of glass-reinforced phenolic composites. Composites Part A: Applied Science and Manufacturing. 29: 939–946.
Hou, M., Ye, L., and Mai, Y. W. 1997. Manufacturing of an Aileron Rib with Advanced Thermoplastic Composites. Journal of Thermoplastic Composite Materials. 10: 185-195.
Soutis, C. Fibre reinforced composites in aircraft construction. 2005. Progress in Aerospace Sciences. 41: 143-151.
Selmy, A. I., Elsesi, A. R., Azab, N. A., and Abd El-baky, M. A. 2012. Interlaminar shear behavior of unidirectional glass fiber (U)/random glass fiber (R)/epoxy hybrid and non-hybrid composite laminates. Composites Part B: Engineering. 43: 1714-1719.
Hernández, S., Sket, F., Molina-Aldareguı´a, J. M., González, C., and LLorca, J. 2011. Effect of curing cycle on void distribution and interlaminar shear strength in polymer-matrix composites. Composites Science and Technology. 71.