Title: Laminated Nanocomposites and Nano-Reinforced Adhesively Bonded Joints with Improved Mechanical Performance and Adhesion

Authors: Ramanan Sritharan, Davood Askari

DOI: 10.33599/nasampe/s.25.0250

Abstract: Composite laminates and bonded joint assemblies have several advantages, and they are widely used in structural applications, because of their lightweight, high strength and stiffness, corrosion resistance, tailorable properties, damage tolerance, reduced maintenance, design flexibility, and tunable thermal and electrical properties. Despite having these superior properties and advantages over traditional materials, composite laminates and joints do have several disadvantages including poor interlaminar properties, difficulty to adhesively bond and repair, sensitivity to UV radiation and moisture, and limited impact resistance and through-the-thickness properties. One of the most promising solutions that can address some of the shortcomings is to incorporate nanomaterials, e.g., carbon nanotubes (CNTs), as a nanoscale reinforcement between the traditional microfiber reinforcements and within the resin system to improve the interlaminar and through-the-thickness properties of the composite laminates and bonded joints assemblies. Our prior studies demonstrated that helical CNTs (HCNTs) perform better than the straight CNTs (SCNTs), due to their unique helical geometries that can provide a nanoscale interlocking mechanisms between the reinforcements and within the solidified resin. In this study, composite and HCNTs reinforced nanocomposite panels with varying weight percentages of HCNTs inclusion (i.e., 0wt%, 0.025wt%, and 0.05wt%) were prepared, cut, and prepared for mechanical testing and analysis, as per ASTM standards (i.e., ASTM D790-17, ASTM D2344/2344M-16, ASTM D3039/D3039M-17, and ASTM D5868-01). The test results for flexural strength, shortbeam strength, tensile strength, and single-lap shear strength for the nanocomposite samples with HCNTs reinforcements were compared to those without nano-reinforcements and promising results were obtained.

References: 1. Pegoretti, A., “Towards sustainable structural composites: A review on the recycling of continuous-fiber-reinforced thermoplastics” Advanced Industrial and Engineering Polymer Research 4(2) (2021): 105-115. DOI: 10.1016/j.aiepr.2021.03.001 2. Akkerman, R., Bouwman, M., and Wijskamp, S., “Analysis of the Thermoplastic Composite Overmolding Process: Interface Strength” Frontiers in Materials 7(27) (2020), DOI: 10.3389/fmats.2020.00027 3. Ageorges, C., Ye, L., and Hou, M., “Advances in fusion bonding techniques for joining thermoplastic matrix composites: a review” Composites Part A 32(6) (2001): 839–857. DOI: 10.1016/S1359-835X(00)00166-4 4. Krueger, R. and Bergan, A., “Advances in Thermoplastic Composites Over Three Decades – A Literature Review” NASA STI Program Report Series (2024) 5. Bonardi, A., Cilloni, R., Paganuzzi, V., and Grizzuti, N., “Effects of Degree of Recycling on the Rheology and Processability of Thermoplastic Polymers” Journal of Polymer Engineering 23(2) (2003): 79-94. DOI: 10.1515/POLYENG.2003.23.2.79 6. Bourban, P.E., Bernet, N., Zanetto, J.E., and Månson, J.A.E., “Material phenomena controlling rapid processing of thermoplastic composites” Composites Part A 32(8): 10451057. DOI: 10.1016/S1359-835X(01)00017-3 7. Eriksson, P.A., Albertsson, A.C., Boydell, P., Eriksson, K., and Månson, J.A.E., “Reprocessing of fiberglass reinforced polyamide 66: Influence on short term properties” Polymer Composites 17(6) (1996): 823-829. DOI: 10.1002/pc.10675 8. Su, K.H., Lin, J.H., and Lin, C.C., „Influence of reprocessing on the mechanical properties and structure of polyamide 6” Journal of Materials Processing Technology 192-193 (2007): 532-538. DOI: 10.1016/j.jmatprotec.2007.04.056 9. Chadwick, A.R., Kotzur, K., and Nowotny, S., “Moderation of thermoplastic composite crystallinity and mechanical properties through in situ manufacturing and post-manufacturing tempering: Part 1 – Mechanical characterization” Composites Part A 143: 106286. DOI: 10.1016/j.compositesa.2021.106286 10. Fricke, D., Raps, L., and Schiel, I., “Prediction of warping in thermoplastic AFP- manufactured laminates through simulation and experimentation” Advanced Manufacturing: Polymer & Composites Science 8(1) (2022): 1-10. DOI: 10.1080/20550340.2021.2015212 11. Kim, J.S. and Lee, D.G., “On-line cure monitoring and viscosity measurement of carbon fiber epoxy composite materials” Journal of Materials Processing Technology 37(1-4) (1993): 405-416. DOI: 10.1016/0924-0136(93)90105-F 12. Chaloupka, A., Pflock, T., Horny, R., Rudolph, N., and Horn, S., “Dielectric and Rheological Study of the Molecular Dynamics during the Cure of an Epoxy Resin” Journal of Polymer Science, Part B 56 (2018): 970-913. DOI: 10.1002/polb.24604 13. Puentes, J., Gralla, P., Ecke, N., “Sensor-Based Data-Driven Optimization of Composites Manufacturing.” SAMPE Europe Conference Proceedings. Madrid, Spain, October 3-5, 2023. Society for the Advancement of Material and Process Engineering.

Conference: SAMPE 2025

Publication Date: 2025/05/19

SKU: TP25-0000000250

Pages: 7

Price: $14.00