Title: Non-Destructive Evaluation (NDE) of Bond-Line Using Carbon Nanofiber and Nanotube Modified Film Adhesive and Infrared Thermography

Authors: William W. Taylor, Nazim Uddin, Melike Dizbay-Onat, Kuang-Ting Hsiao

DOI: 10.33599/nasampe/c.22.0138

Abstract: A film adhesive is commonly used to form the bond-line between the composite or metal parts. The bond-line's quality and performance can be affected by defects such as voids, impurities, agglomerations, and other structural issues found within it; in addition, defects can form due to damage or delamination. Identifying these defects is possible with non-destructive evaluation (NDE). In this paper, the joule-heating effect through carbon nanofibers (CNF) and carbon nanotubes (CNT) modified film adhesive will be used along with infrared thermography for bond-line defect inspection. Due to the difference in the electrical conductivity between the modified epoxy and the defect, joule heating can cause a different temperature at the defect; thus, in theory, the defect can be viewed by infrared thermograph. The percentage of carbon nanofiller in a film adhesive will change the measurement quality due to its relationship to electrical conductivity. An Acrylonitrile Butadiene Styrene (ABS) equilateral triangle defect with 30 mm sides was used inside bond-line samples. These bond-lines were composed of nanofillers of CNF and CNT at the various concentrations. Each concentration was evaluated individually and bonded to two single-ply CFRP coupons. In this study the feasibility of using carbon nanofillers of different concentrations as a medium for identifying and characterizing defects through NDE infrared thermography was investigated and validated the effectiveness of this new NDE approach . In the future, aligning nanofiller for bond-lines would be a possible research direction to improve upon what this study strives to achieve.

References: 1. Budhe, S., Banea, M. D., De Barros, S. & Da Silva, L. F. M., “An updated review of adhesively bonded joints in composite materials.” International Journal of Adhesion and Adhesives, 72 (2017): 30-42. 2. Gholizadeh, S., “A review of non-destructive testing methods of composite materials.” Procedia Structural Integrity, 1 (2016): 50-57. https://doi.org/10.1016/j.prostr.2016.02.008. 3. Usamentiaga, R., Venegas, P., Guerediaga, J., Vega, L., Molleda, J. & Bulnes, F. G.. “Infrared thermography for temperature measurement and non-destructive testing.” Sensors, 14, no. 7 (2014): 12305-12348. 4. Hsiao, K.T., Alms, J. & Advani, S., “Use of epoxy/multiwalled carbon nanotubes as adhesives to join graphite fibre reinforced polymer composites.” Nanotechnology,v14 (2003): 791-793. 5. Taylor, W.W., Uddin, M.N., Islam, M.R., Dizbay-Onat, M. & Hsiao, K-T., “A preliminary study of using film adhesives containing aligned and unaligned nanotubes and nanofibers for bonding CFRP laminates and steel plates.” Proceedings of SAMPE 2022 Conference, Charlotte, NC, USA. May 23-26, 2022. 6. Kumar, V., Yokozeki, T., Karch, C., Hassen, A., Hershey, C., Kim, S., Lindahl, J., Barnes, A., Bandari, Y. & Kunc, V., “Factors affecting direct lightning strike damage to fiber reinforced composites: A review.” Composites Part B: Engineering, 83 (2020). 7. Sung, P.C. & Chang, S.C., “The adhesive bonding with buckypaper–carbon nanotube/epoxy composite adhesives cured by Joule heating.” Carbon, 91 (2015): . 8. Kumar, V., Yokozeki, T., Okada, T., Hirano, Y., Goto, T., Takahashi, T. & Ogasawara, T., “Effect of through-thickness electrical conductivity of CFRPs on lightning strike damages.” Composites Part A: Applied Science and Manufacturing, 114 (2018): 429-438. https://doi.org/10.1016/j.compositesa.2018.09.007. 9. Bal, S., “Experimental study of mechanical and electrical properties of carbon nanofiber/epoxy composites.” Materials & Design (1980-2015), 31.5 (2010): 2406-2413. 10. Li, C., Thostenson E. T. & Chou T.-W., “Dominant role of tunneling resistance in the electrical conductivity of carbon nanotube–based composites.” Applied Physics, Letters 91.22 (2007). 11. Bell, T., “What Makes Metals Conductive?”. ThoughtCo. March 2, 2020. July 19th, 2022 https://www.thoughtco.com/electrical-conductivity-in-metals-2340117. 12. Loos M., “Chapter 5 – Fundamentals of Polymer Matrix Composites Containing CNTs” Carbon Nanotube Reinforced Composites, William Andrew, 2015. https://doi.org/10.1016/B978-1-4557-3195-4.00005-9. 13. Rahman M., Schott N. R. & Sadhu L. K.. “Glass transition of ABS in 3D printing” COMSOL Conference, Boston, MA, 2016. 14. Singh, N. & Singh, R., “Conducting Polymer Solution and Gel Processing.” Reference Module in Materials Science and Materials Engineering, Elsevier, 2017. https://doi.org/10.1016/B978-0-12-803581-8.03733-4. 15. Lanc, Z., Zeljković, M., Štrbac, B., Živković, A., Drstvenšek, I. & Hadžistević, M.. “The determination of the emissivity of aluminum alloy AW 6082 using infrared thermography.” J. Prod. Eng, 18 (2015): 23-26. 16. Ranabhat, B. & Hsiao, K. T. “Improve the through-thickness electrical conductivity of CFRP laminate using flow-aligned carbon nanofiber z-threads”. Proceedings of SAMPE 2018, Long Beach, CA, May 21-24, 2018.

Conference: CAMX 2022

Publication Date: 2022/10/17

SKU: TP22-0000000138

Pages: 15

Price: $30.00