Title: Effect of Cure and Conditioning on the Mechanical Behavior of MTM 45-1 Woven Carbon Epoxy Composite

Authors: Scott Nesbitt, Hannes Koerber, Luciano Avila Gray, Anoush Poursartip, Casey J. Keulen

DOI: 10.33599/nasampe/s.24.0266

Abstract: Current specifications for cure cycles define a process window within which a composite part is 'acceptably' cured. It has always been well-known that the degree of cure affects mechanical properties, but there is limited data currently available to demonstrate the effect, especially under hot-wet conditions. This paper continues a study that was presented at SAMPE Seattle, 2023 by extending the investigation to include the effect of various levels of degree of cure on moisture conditioned samples at both ambient and elevated temperatures. The results of over 120 mechanical tests under ambient-dry, ambient-wet, hot-dry, and hot-wet conditions including tensile, compression, in-plane shear, and short-beam shear (interlaminar shear strength) on specimens that have been moderately under-cured, and cured according to the manufacturer’s recommended cure cycle are presented. This data is compared to NCAMP data as a benchmark. Analytical testing and cure simulations were used to plan out the cure process and verify the as-tested properties of the partially cured samples, including degree of cure and glass transition temperature.

References: [1]S.-Y. Lee and G. S. Springer, “Effects of Cure on the Mechanical Properties of Composites,” Journal of Composite Materials, vol. 22, no. 1, pp. 15–29, Jan. 1988, doi: 10.1177/002199838802200102. [2]S. Nesbitt, H. Koerber, A. Poursartip, and C. Keulen, “Effect Of Cure On Mechanical Properties Of MTM 45-1 Matrix Composite,” SAMPE Seattle, 2023. [3]CMH-17, Ch. 2, vol. 1, 6 vols. SAE International, 2012. [4]A. Le Guen-Geffroy, P.-Y. Le Gac, B. Habert, and P. Davies, “Physical ageing of epoxy in a wet environment: Coupling between plasticization and physical ageing,” Polymer Degradation and Stability, vol. 168, p. 108947, Oct. 2019, doi: 10.1016/j.polymdegradstab.2019.108947. [5]B. De’Nève and M. E. R. Shanahan, “Water absorption by an epoxy resin and its effect on the mechanical properties and infra-red spectra,” Polymer, vol. 34, no. 24, pp. 5099–5105, Dec. 1993, doi: 10.1016/0032-3861(93)90254-8. [6]P. Nogueira et al., “Effect of water sorption on the structure and mechanical properties of an epoxy resin system,” Journal of Applied Polymer Science, vol. 80, no. 1, pp. 71–80, 2001, doi: 10.1002/1097-4628(20010404)80:1<71::AID-APP1077>3.0.CO;2-H. [7]J. Kay, L. Fahrang, K. Hsiao, and G. Fernlund, “Effect of process conditions on porosity in out-of-autoclave prepreg laminates,” 18th International Conference on Composite Materials (ICCM), 2011. [8]S. Mohseni, G. Fernlund, and M. Lane, “Cure cycle design to suppress moisture-driven bubble growth in polymer composites,” Journal of Composite Materials, vol. 52, no. 13, pp. 1821–1832, Jun. 2018, doi: 10.1177/0021998317734393. [9]“Effect of cure on mechanical properties of a composite (Part 1 of 2) - A319 - CKN Knowledge in Practice Centre.” Accessed: Jan. 09, 2023. [Online]. Available: https://compositeskn.org/KPC/A319 [10]“Effect of cure on mechanical properties of a composite (Part 2 of 2) - A320 - CKN Knowledge in Practice Centre.” Accessed: Jan. 09, 2023. [Online]. Available: https://compositeskn.org/KPC/A320 [11]Y. Ng et al., “Fabrication of NMS 451 Qualification, Equivalency, and Acceptance Test Panels (Solvay (Formerly Advanced Composites Group (ACG) MTM45-1 prepregs),” NCAMP, 2022. [12]ASTM D3039, “Standard Test Method for Tensile Properties of Polymer Matrix Composite Materials.” [13]ASTM D6641, “Standard Test Method for Compressive Properties of Polymer Matrix Composite Materials Using a Combined Loading Compression (CLC) Test Fixture.” [14]ASTM D7078, “Standard Test Method for Shear Properties of Composite Materials by V-Notched Rail Shear Method.” [15]ASTM D2344, “Standard Test Method for Short-Beam Strength of Polymer Matrix Composite Materials and Their Laminates.” [16]E. Clarkson, “FAA Special Project Number SP3505WI-Q,” 2019.

Conference: SAMPE 2024

Publication Date: 2024/05/20

SKU: TP24-0000000266

Pages: 15

Price: $30.00