Title: ADVANCES IN OUT-OF-AUTOCLAVE CONSOLIDATION OF THERMOPLASTIC COMPOSITES
Authors: Erik T.M. Krämer, J.N. Swamy, T.J. Asijee, S. Wijskamp
Abstract: Cost-effective manufacturing of large and complex structures for aerospace applications is very promising yet not straightforward for thermoplastic composites. The currently accepted manufacturing technology for such structures is autoclave consolidation, which is expensive. Recent studies at the TPRC focused on different out-of-autoclave consolidation technologies, such as laser-assisted fiber placement with in-situ consolidation and a combination with secondary consolidation via stamp forming or vacuum-bag-only processing. The air evacuation during vacuum-bag-only consolidation was investigated, showing that the intra-ply diffusion and the presence of inter-ply air channels are important factors. The introduction of gaps between tapes during tape placement was investigated as a potential solution for improving the in-plane air evacuation for preforms with limited air inter-ply channels. It was shown that these channels can be produced with the fiber placement process, and that they result in good consolidation quality for the material system investigated in this paper.
References: 1. T. Kok, On the consolidation quality in laser assisted fiber placement: the role of the heating phase, PhD Thesis: University of Twente, 2018. [doi:10.3990/1.9789036546065] 2. T. Kok, W. J. B. Grouve, L. L.,Warnet & R. Akkerman, Effect of ply orientation on bond strength in fiber-placed composites. Paper presented at 20th International Conference on Composite Materials, ICCM 2015, Copenhagen, Denmark. 3. H. Mason and J. Sloan, Out-of-autoclave VBO rear spar, thermoplastic ribs target wing of tomorrow, online at: compositesworld.com, 2021. 4. A. J. Comer et al., Mechanical characterisation of carbon fibre-PEEK manufactured by laser-assisted automated-tape-placement and autoclave, Composites Part A: Applied Science and Manufacturing 412, 2015. [doi:10.1016/j.compositesa.2014.10.003] 5. T.K. Slange, Rapid Manufacturing of Tailored Thermoplastic Composites by Automated Lay-up and Stamp Forming, PhD Thesis: University of Twente, 2019. [doi:10.3990/1.9789036547284] 6. J.N. Swamy et al, Vacuum-bag-only consolidation of C/PEKK fiber placed preforms with engineered gas evacuation channels, preprint to be submitted, TPRC 2023 7. M. Mehdikhani et al., Voids in fiber-reinforced polymer composites: A review on their formation, characteristics, and effects on mechanical performance, Journal of Composite Materials 53 (12), 2019. [doi:10.1177/0021998318772152] 8. W.J.B. Grouve, Weld strength of laser-assisted tape-placed thermoplastic composites, PhD Thesis: University of Twente, 2012. [doi: 10.3990/1.9789036533928] 9. C.M. Stokes-Griffin and P. Compston, Optical characterization and modelling for oblique near-infrared laser heating of carbon fibre reinforced thermoplastic composites, Optics and Lasers in Engineering, 2015. 10. J. Tierney and J.W. Gillespie Jr, Modeling of heat transfer and void dynamics for the thermoplastic composite tow-placement process, Journal of Composite Materials 37, 2003 11. D. Zhang, D. Heider, S. G. Advani, J. W. Gillespie, Out of autoclave consolidation of voids in continuous fiber reinforced thermoplastic composites, in: International SAMPE Technical Conference, no. May, 2013.
Conference: SAMPE 2023
Publication Date: 2023/04/17
Price: $20.00Get This Paper