Crack repair of aluminium components using glass fibre reinforced polymer composite patches: Effect of patch thickness on tensile behaviour
DOI:
https://doi.org/10.15282/jmes.20.1.2026.1.0861Keywords:
Crack repair, Aluminium, GFRP composites, Tensile strength, Patch thicknessAbstract
Crack propagation in metallic structures is a critical issue in industries such as aerospace, oil and gas, and automotive, where conventional repair methods such as welding or part replacement are often costly and time-consuming. This study investigates the effectiveness of Glass Fibre Reinforced Polymer (GFRP) composite patches for repairing cracked aluminium sheets. Centre- and edge-notched specimens with crack lengths of 5, 10, and 15 mm were fabricated and repaired using hand lay-up GFRP patches of varying thicknesses (two and four layers). Tensile tests were performed according to ASTM E8 to evaluate the mechanical performance of repaired specimens compared with unrepaired samples. The results demonstrated that composite patches significantly improved the load-carrying capacity of cracked specimens, with thicker patches providing higher strength recovery. Specifically, specimens with four-layer GFRP patches produced the highest maximum stresses of 152.44 MPa and 184.67 MPa for edge and centre cracks of 5 mm, respectively, compared with substantially lower strengths in unrepaired samples. An increase in patch thickness led to greater tensile-strength recovery; however, this improvement must be weighed against weight considerations, particularly in weight-sensitive applications such as aerospace structures.
References
[1] Z. Liu, B. He, T. Lyu, and Y. Zou, “A review on additive manufacturing of titanium alloys for aerospace applications: Directed energy deposition and beyond Ti-6Al-4V,” JOM, vol. 73, no. 6, pp. 1804–1818, 2021.
[2] M. Ramezani, Z. Mohd Ripin, T. Pasang, and C.-P. Jiang, “Surface engineering of metals: Techniques, characterizations and applications,” Metals, vol. 13, no. 7, p. 1299, 2023.
[3] B. Blakey-Milner, P. Gradl, G. Snedden, M. Brooks, J. Pitot, E. Lopez, et al., “Metal additive manufacturing in aerospace: A review,” Materials & Design, vol. 209, p. 110008, 2021.
[4] V. A. Solovyeva, K. H. Almuhammadi, and W. O. Badeghaish, “Current downhole corrosion control solutions and trends in the oil and gas industry: A review,” Materials, vol. 16, no. 5, p. 1795, 2023.
[5] V. G. Bondur, “Aerospace methods and technologies for monitoring oil and gas areas and facilities,” Izvestiya, Atmospheric and Oceanic Physics, vol. 47, no. 9, pp. 1007–1018, 2011.
[6] B. Ravichandran and M. Balasubramanian, “A comprehensive review on sustainability evaluation of joining methods for engineering materials,” Materials Today Sustainability, vol. 31, p. 101151, 2025.
[7] E. S. V. Marques, F. J. G. Silva, and A. B. Pereira, “Comparison of finite element methods in fusion welding processes—A review,” Metals, vol. 10, no. 1, p. 75, 2020.
[8] H. Sharma, A. Kumar, S. Rana, N.G. Sahoo, M. Jamil, R. Kumar et al., “Critical review on advancements on the fiber-reinforced composites: Role of fiber/matrix modification on the performance of the fibrous composites,” Journal of Materials Research and Technology, vol. 26, pp. 2975–3002, 2023.
[9] C. V. Srinivasa and K. N. Bharath, “Impact and hardness properties of areca fiber-epoxy reinforced composites,” Journal of Materials and Environmental Science, vol. 2, no. 4, pp. 351–356, 2011.
[10] R. A. Ilyas, N. M. Nurazzi, and M. N. F. Norrrahim, “Fiber-reinforced polymer nanocomposites,” Nanomaterials, vol. 12, no. 17, p. 3045, 2022.
[11] K. B. Katnam, L. F. M. Da Silva, and T. M. Young, “Bonded repair of composite aircraft structures: A review of scientific challenges and opportunities,” Progress in Aerospace Sciences, vol. 61, pp. 26–42, 2013.
[12] N. Maqsood, M. Rimašauskas, M. Ghobakhloo, G. Mordas, and K. Skotnicová, “Additive manufacturing of continuous carbon fiber reinforced polymer composites using materials extrusion process. Mechanical properties, process parameters, fracture analysis, challenges, and future prospect. A review,” Advanced Composites and Hybrid Materials, vol. 7, no. 6, p. 202, 2024.
[13] Z. Zhang, J. Shi, T. Yu, A. Santomauro, A. Gordon, J. Gou, et al., “Predicting flexural strength of additively manufactured continuous carbon fiber-reinforced polymer composites using machine learning,” Journal of Computing and Information Science in Engineering, vol. 20, no. 6, p. 061015, 2020.
[14] D. S. Vijayan, A. Sivasuriyan, P. Devarajan, A. Stefańska, Ł. Wodzyński, and E. Koda, “Carbon fibre-reinforced polymer (CFRP) composites in civil engineering application—A comprehensive review,” Buildings, vol. 13, no. 6, p. 1509, 2023.
[15] S. M. A. Khan Mohammed, R. Mhamdia, A. Albedah, B. A. Bachir Bouiadjra, B. B. Bouiadjra, and F. Benyahia, “Fatigue crack growth in aluminum panels repaired with different shapes of single-sided composite patches,” International Journal of Adhesion and Adhesives, vol. 105, p. 102781, 2021.
[16] A. Landesmann, C. A. Seruti, and E. D. M. Batista, “Mechanical properties of glass fiber reinforced polymers members for structural applications,” Materials Research, vol. 18, no. 6, pp. 1372–1383, 2015.
[17] B. Giosuè and R. Salvatore, “Free vibrations of pultruded FRP elements: Mechanical characterization, analysis, and applications,” Journal of Composites for Construction, vol. 13, no. 6, pp. 565–574, 2009.
[18] L. Wang, L. Tong, S. Zhu, J. Liang, and H. Zhang, “Enhancing the mechanical performance of glass fiber-reinforced polymer composites using multi-walled carbon nanotubes,” Advanced Engineering Materials, vol. 22, no. 8, p. 2000318, 2020.
[19] S. Tim, P. Giovanni, M. Odine, and B. Barbara, “Shear strengthening masonry panels with sheet glass-fiber reinforced polymer,” Journal of Composites for Construction, vol. 8, no. 5, pp. 434–443, 2004.
[20] R. Mathieu and B. Brahim, “Behavior of GFRP reinforcing bars subjected to extreme temperatures,” Journal of Composites for Construction, vol. 14, no. 4, pp. 353–360, 2010.
[21] B. Horn, J. Neumayer, and K. Drechsler, “Influence of patch length and thickness on strength and stiffness of patched laminates,” Journal of Composite Materials, vol. 52, pp. 2199–2212, 2017.
[22] H. N. Maleki and T. Navid Chakherlou, “Investigation of the effect of bonded composite patch on the mixed-mode fracture strength and stress intensity factors for an edge crack in aluminum alloy 2024-T3 plates,” Journal of Reinforced Plastics and Composites, vol. 36, pp. 1074–1091, 2017.
[23] M. Kara, M. Uyaner, and A. Avci, “Repairing impact damaged fiber reinforced composite pipes by external wrapping with composite patches,” Composite Structures, vol. 123, pp. 1-8, 2015.
[24] A. Achour and B. B. Bouiadjra, “Numerical analysis of the behavior of repaired cracks with composite patch in thick metallic structures (S06),” in Proceedings of the 22nd Congrès Français de Mécanique (CFM 2015), Lyon, France, 2015.
[25] R. Srilakshmi and M. Ramji, “Experimental investigation of adhesively bonded patch repair of an inclined center cracked panel using DIC,” Journal of Reinforced Plastics and Composites, vol. 33, pp. 1130–1147, 2014.
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