Title: A Preliminary Study of the Electrical and Interlaminar Shear Properties of a Porous CFRP Composite Laminate Containing Carbon Nanofiber Z-Threads
Authors: Sebastian Kirmse, Bikash Ranabhat, and Kuang-Ting Hsiao
DOI: 10.33599/nasampe/c.19.0773
Abstract: In this study, a porous carbon fiber/epoxy nanocomposite (P-ZT-CFRP) containing a low concentration of z threaded carbon nanofibers was manufactured. DC electrical conductivity measurements and interlaminar shear tests were performed on the porous nanocomposite. It was hypothesized that the CNFs interlock and connect multiple arrays of carbon fibers using a connecting agent (i.e., resin) at contact locations between the CNFs and carbon fibers, which provides additional strength to the otherwise weak porous composite laminate while making it extremely conductive. The through-thickness DC electrical conductivity was increased by 2840% (9.37 S/m) and 2971% (9.81 S/m) for the unidirectional porous nanocomposite laminate containing 0.85wt% and 2.0wt% of CNF z threads, respectively, when compared to a traditional carbon fiber reinforced polymer (CFRP) (0.33 S/m). Void characterization showed that the void content in the matrix for the porous nanocomposites was at least 20%, which satisfies the definition of a porous nanocomposite [1]. The interlaminar shear strength of the 0.85wt% CNF z-threaded P-ZT-CFRP with a fiber volume fraction of around 80% was about 50% higher than for a P-CFRP without CNFs. Furthermore, the porous nanocomposite showed good potential in overcoming the effects of void on the mechanical properties of CFRPs. Using the rule of mixture, the P-ZT-CFRP shows a ~10.5% increase in longitudinal tensile strength and modulus when compared to a traditional CFRP. It was concluded that the material has high potential but will require additional research and research collaborations between industry partners to develop a possible next-generation multi functional nanocomposite.
References: 1. Hsiao, K.-T. “Porous Nanocomposite and Related Method,” US 2017/0240715 A1, 2017. 2. Spitalsky, Z., Tasis, D., Papagelis, K., and Galiotis, C. “Carbon nanotube – polymer composites: Chemistry, processing, mechanical and electrical properties,” Progress in Polymer Science 35(3) (2010): 357–401. DOI: 10.1016/j.progpolymsci.2009.09.003. 3. Mehdikhani, M., Gorbatikh, L., Verpoest, I., and Lomov, S. V. “Voids in fiber-reinforced polymer composites: A review on their formation, characteristics, and effects on mechanical performance,” Journal of Composite Materials 53(12) (2019): 1579–1669. DOI: 10.1177/0021998318772152. 4. Hsiao, K.T., Scruggs, A.M., Brewer, J.S., Hickman, G.J.S., McDonald, E.E., and Henderson, K. “Effect of carbon nanofiber z-threads on mode-I delamination toughness of carbon fiber reinforced plastic laminates,” Composites Part A: Applied Science and Manufacturing 91 (2016): 324–335. DOI: 10.1016/j.compositesa.2016.10.022. 5. Scruggs, A.M., Henderson, K., and Hsiao, K. “Characterization of Electrical Conductivity of a Carbon Fiber Reinforced Plastic Laminate Reinforced With Z-Aligned Carbon Nanofibers,” in Proceedings of CAMX 2016 (The Composites and Advanced Materials Expo), Anaheim, CA, Sept. 26-29, 2016, TP16-0137. 6. Scruggs, A.M. “Enhancement of Through-Thickness Electrical Conductivity Due to Carbon Nanofiber Z-Threads in Unidirectional Carbon Fiber Reinforced Plastic Laminates,” [M.S. Thesis]. Department of Mechanical Engineering, University of South Alabama, Mobile, Alabama, 2018. 7. Ranabhat, B., and Hsiao, K. “Improve the Through-Thickness Electrical Conductivity of CFRP Improve the Through-Thickness Electrical Conductivity of CFRP Laminate Using Flow- Aligned Carbon Nanofiber Z-Threads,” in Proceedings of SAMPE 2018 (Society for the Advancement of Material and Process Engineering), Long Beach, CA, May, 21-24, 2018, SE18--1100. 8. Scruggs, A.M., Kirmse, S., and Hsiao, K.-T. “Enhancement of Through-Thickness Thermal Transport in Unidirectional Carbon Fiber Reinforced Plastic Laminates due to the Synergetic Role of Carbon Nanofiber Z-Threads,” Journal of Nanomaterials 2019 (2019): 1–13. DOI: 10.1155/2019/8928917. 9. Kirmse, S., and Hsiao, K.-T. “Enhancing the Interlaminar Shear Strength of Unidirectional Carbon Fiber Reinforced Plastic (CFRP) Laminate Using a Nanofiber Z-Threading Strategy,” in Proceedings of CAMX 2018 (The Composites and Advanced Materials Expo), Dallas, TX, Oct. 15-18, 2018, TP18--0499. 10. Kirmse, S. “Interlaminar Shear Strength Enhancement of Unidirectional Carbon Fiber Reinforced Plastic Laminates Using a Carbon Nanofiber Z-Threading Technique,” [M.S. Thesis]. Department of Mechanical Engineering, University of South Alabama, Mobile, Alabama, 2018. 11. Kirmse, S., Kim, K., Ranabhat, B., and Hsiao, K.-T. “Effects of Carbon Nanofiber Z-Threads on the Longitudinal Compressive Strength of Unidirectional CFRP Laminates,” in Proceedings of SAMPE 2019 - Charlotte, NC, May 20-23, 2019, TP19--1531. DOI: 10.33599/nasampe/s.19.1531. 12. “Air density and Specific Weight Equations and Calculator,” Engineers EDGE - Solution By Design, 2019. [Online]. Available: https://www.engineersedge.com/calculators/air-density.htm. 13. Judd, N.C.W., and Wright, W.W. “Voids and Their Effects on Mechanical-Properties of Composites – An Appraisal,” SAMPE Journal 14(1) (1977): 10–14.
Conference: CAMX 2019
Publication Date: 2019/09/23
SKU: TP19-0773
Pages: 15
Price: $30.00
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