Title: Effect of Fast Cure Cycles on Mode I And Mode II Interlaminar Fracture Toughness for Interlayer Toughened Prepreg Composites
Authors: Cheng Chen, Anoush Poursartip and Göran Fernlund
Abstract: Faster cure cycles for thermoset prepreg composites are required to achieve higher production rates in the aerospace industry. This work studies the effect of fast cure cycles on the static Mode I (GIc) and Mode II (GIIc) interlaminar fracture toughness of an interlayer toughened composite material system, T800SC/3900-2B. Composite laminates were processed to the same degree of cure using a manufacturer's recommended cure cycle (MRCC), and three faster cure cycles with high heating rates (>2.8 °C/min) or high curing temperatures (>180 °C). The initiation and propagation GIc and GIIc were measured using Double Cantilever Beam (DCB) and End-notched Flexure (ENF) tests under static loading, respectively. Results show that curing conditions affect interlayer microstructures and the morphology of toughening particles. However, the initiation and propagation GIc and GIIc are not sensitive to the applied higher heating rates and curing temperatures. These results suggest that there may be an opportunity to greatly reduce the processing time for T800SC/3900-2B prepregs using faster cure cycles outside of the manufacturer's recommended processing window, yet retaining high interlaminar fracture toughness.
References: 1] Inc. TCMA. 3900 PREPREG SYSTEM Catalogue 2017.  Hexcel. HexPly ® M21 - Product Data Sheet - EU Version. Hexcel 2015.  Cytec Industries. CYCOM ® 5250-4 Technical Data Sheet 2011.  Cytec Industries. 977-3 Epoxy Resin System 2006.  HEXCEL. HexPly ® M65 Product Data Sheet. 2016.  Hexcel. HexPly 8552 Product Data Sheet 2016:1–6.  Cytec Industries Inc. AEROSPACE MATERIALS CYCOM ® 970 Epoxy Resin. 2013.  SLOAN PM& J. Fast and Faster: Rapid-cure resins drive down cycle times. CompositesWorld 2018. https://www.compositesworld.com/articles/fast-and-faster-rapid-cure-epoxies-drive-down-cycle-times.  Nguyen FN, Yoshioka K, Toshiya Kamae IT, Kitano A. Fast-cycle cfrp manufacturing technologies for automobile applications n.d.  Odagiri N, Kishi H, Yamashita M. Development of torayca prepreg p2302 carbon fiber reinforced plastic for aircraft primary structural materials. Adv Compos Mater 1996;5:249–54. doi:10.1163/156855196X00301.  Hexcel. Hexcel ready to fly on the A350 XWB. Reinf Plast 2013;57:25–6. doi:10.1016/s0034-3617(13)70089-4.  Hunt C, Kratz J, Partridge IK. Cure path dependency of mode i fracture toughness in thermoplastic particle interleaf toughened prepreg laminates. Compos Part A Appl Sci Manuf 2016;87:109–14. doi:10.1016/j.compositesa.2016.04.016.  Incerti D, Wang T, Carolan D, Fergusson A. Curing rate effects on the toughness of epoxy polymers. Polymer (Guildf) 2018;159:116–23. doi:10.1016/j.polymer.2018.11.008.  Donna Dykeman. Minimizing uncertainty in cure modeling for composites manufacturing. University of British Columbia, 2008. doi:10.14288/1.0066334.  ASTM D5528-01. Standard test method for mode I interlaminar fracture toughness of unidirectional fiber-reinforced polymer matrix composites. Am Stand Test Methods 2014;03:1–12. doi:10.1520/D5528-13.2.  ASTM D7905. Standard test method for determination of the mode II interlaminar fracture toughness of unidirectional fiber-reinforced polymer matrix composites. Astm 2014:1–18. doi:10.1520/D7905.  Chen C, Poursartip A, Fernlund G. Cure-dependent microstructures and their effect on elastic properties of interlayer toughened thermoset composites 2019. Manuscript submitted for publication.  Chen C, Nesbitt S, Reiner J, Poursartip A, Vaziri R. Cure path dependency of static and dynamic Mode II interlaminar fracture toughness of interlayer toughened composite laminates 2020. Manuscript submitted for publication.
Conference: SAMPE 2020 | Virtual Series
Publication Date: 2020/06/01
Price: FREEGet This Paper