Crack Growth of Aluminum Alloy Sheets Used in Aircraft Wings, Taking into Consideration the Critical Angles of Attack
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This study examines the behavior of fatigue crack propagation in aluminum alloy sheets used in aircraft wings, with a particular focus on critical angles of attack (AOA). The widely utilized aluminum alloys 2024-T3 and 7075-T6 were analyzed to determine the effects of varying AOAs, representing normal flight (5°) and takeoff/landing (10°) on crack growth rates. A comprehensive approach was adopted, integrating experimental testing, numerical simulations, and analytical modeling. Experimental methods included material characterization and multiaxial fatigue tests using an innovative apparatus. Numerical simulations conducted with ANSYS 2021 CFD evaluated stress distributions and crack propagation under different wind loads and AOA conditions. Analytical modeling applied the Paris-Erdogan equation and fracture mechanics principles to predict crack growth behavior.
The results revealed that higher AOAs significantly accelerate crack growth in both alloys. Notably, AL2024-T3 demonstrated slower crack propagation than AL7075-T6, indicating superior fatigue resistance, especially at lower AOAs. The fracture growth rates were determined to be 0.005 mm/sec for AL2024-T3 and 0.009 mm/sec for AL7075-T6. These findings have important implications for aircraft design, maintenance, and material selection. They underscore the necessity of accounting for AOA-dependent fatigue behavior to improve the durability and safety of aircraft structures.
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Ahmed A. A., Azhar K. F., 2011. The static analysis of the composite aircraft wing box structure. Journal of Engineering, 17(06), pp. 1379–1390. https://doi.org/10.31026/j.eng.2011.06.06
Anderson, T.L. and Anderson, T.L., 2005. Fracture mechanics: Fundamentals and applications. CRC Press.
ASTM E1251, 2019. Standard test method for analysis of aluminum and aluminum alloys by spark atomic emission spectrometry.
ASTM E8/E8M, 2020. Standard test methods for the testing of the tension of metallic materials.
Blazic, M., Maksimovic, S., Petrovic, Z., Vasovic, I., Turnic, D., 2014. Determination of the trajectory of fatigue crack growth and residual life under mixed modes. Journal of Mechanical Engineering, 60, pp. 250–254. https://doi.org/10.5545/sv-jme.2013.1354
Choudhury, D., Krishnamoorthy, V., 2018. CFD analysis of airfoil aerodynamics and stress distribution for the assessment of structural integrity. Aerospace Science and Technology, 79, pp. 400–410.
Ewalds, H. L., Wanhill, R. J. H., 1989. Fracture Mechanics Handbook. ISBN 0-7131-3515-8.
Harsha, P., Dazan, F., Arpit, K., Dhaneshwar, M., 2021. Finite element analysis of fatigue and fracture behavior in an idealized airplane wing model with an embedded crack under wind load. Community-Based Research and Innovations in Civil Engineering. https://doi.org/10.1088/1755-1315/796/1/012071.
Harris, D. S., Smith, T. L., 2019. Impact of aerodynamic loads and weather-induced forces on the integrity of the aircraft wings. International Journal of Aerospace Engineering, 7425412.
Hatem, R. W., 2016. Numerical and experimental analysis of aircraft wings subjected to fatigue loading. Journal of Engineering, 22(10), pp. 62–83. https://doi.org/10.31026/j.eng.2016.10.05
Hayder, K. S., 2016. The effect of vehicle body shapes on the near wake region and drag coefficient: a numerical study. Journal of Engineering, 22(9), pp. 115–131. https://doi.org/10.31026/j.eng.2016.09.08
Hayder, S. A., Fathi, A. Al., 2023. Propagation of dynamic crack growth of AL 2024 thin plates reinforced with carbon nanotubes subjected to nonproportional cycling loading. Results in Engineering, 19, 101239. https://doi.org/10.1016/j.rineng.2023.101239
Huang, Y., Zhang, L., 2019. Numerical analysis of airfoil aerodynamics using ANSYS Fluent for lift, drag, and pressure distribution. Journal of Aerospace Engineering, 32(3), 04019019. https://doi.org/10.1061/(ASCE)AS.1943-5525.0001006.
Jensen, C., Lee, H. J., 2020. Effect of the angle of attack on the growth of fatigue cracks in aircraft wings under aerodynamic loading. Engineering Fracture Mechanics, 228, 106934.
Karima, E. A., 2012. Experimental and numerical evaluation of the friction stir welding of AA 2024-W aluminum alloy. Journal of Engineering, 18(6), pp. 717- 734. https://doi.org/10.31026/j.eng.2012.06.03
Levent, Ü., 2010. Structural design and analysis of mission-adaptive wings of an unmanned aerial vehicle. Thesis (MSc), Middle East Technical University, Turkey.
Liu, X., Xie, Y., 2018. Fatigue crack growth behavior of the aircraft wing structure under aerodynamic loads. Journal of Aircraft, 55(4), pp. 1254–1262.
Mallinson, G. D., 1999. Computational Fluid Dynamics Lecture Notes. Department of Mechanical Engineering, University of Auckland, Chapter 4, pp. 33–43.
Mark, K. Y., 2014. Piper-PA-23-250-Turbo-Aztec-F. Aviation Photo, #2398780. https://www.airliners.net/photo/Untitled/Piper-PA-23-250-Turbo-Aztec-F/2398780
Meggiolaro, M. A., Miranda, A.C. O., Castro, J. T. P., Marta, L. F., 2005. Stress intensity factor equations for the growth of branched cracks. Engineering Fracture Mechanics, 72, p. 2647–2671. https://doi.org/10.1016/j.engfracmech.2005.05.004
Mustafa, M. K., Fathi A. Al., 2022. Glass laminate aluminum reinforced epoxy under nonproportional multiaxial fatigue loading: experimental testing and new fatigue apparatus development. Results in Engineering, 16. https://doi.org/10.1016/j.rineng.2022.100773
Nalla, R. K., Campbell, J. P., Ritchie, R. O., 2002. Fatigue crack growth under variable-amplitude loading in aluminum alloys: Role of microstructure and environment. Metallurgical and Materials Transactions A, 33(2), pp. 283–293.
Nasser, A., Mostaghimi, J., 2019. An introduction to computational fluid dynamics. Chapter 20 of the Fluid Flow Handbook.
Omar, A. J., Fathi A. Al., 2019. Dynamic crack propagation in nanocomposite thin plates under multi-axial cyclic loading. Journal of Materials Research and Technology, 8, pp. 4672–4681. https://doi.org/10.1016/j.jmrt.2019.08.011
Rafid, M. M., Fathi, A. Al., 2022. Study the effect of multiaxial cycling loading on the dynamic crack propagation in aluminum plates. International Journal of Mechanical Engineering, 7(7).
Ragab, A. R., Salah, E. B., 1999. Solid mechanics engineering. CRC Press, ISBN 0-8493-1607-3.
Richard, H. A., Full, M., and Sander, M., 2004. Prediction of the crack path. Institute of Applied Mechanics, pp. 3–12. https://doi.org/10.1111/j.1460-2695.2004.00855.x.
Rosenberg, Z., Altus, E., 2020. Multiaxial fatigue of aluminum alloys under combined cyclic tension, bending, and torsion loading. Fatigue and Fracture of Engineering Materials and Structures, 43(10), pp. 2154–2166.
Schijve, J., 2009. Fatigue of Structures and Materials. Springer. https://doi.org/10.1007/978-1-4020-6808-9.
Setiawan, B., 2016. Simulation of the effect of airfoil NACA 4412 and MH60 with variations in the taper ratio on the CL and CD of unmanned aircraft for the surveillance mission. Doctoral dissertation, Gadjah Mada University, Jakarta.
Sih, G. C., Wang, Y., 2018. Fatigue behavior and testing of aluminum alloys for aircraft structures. Materials Science and Engineering, A, 710, pp. 251–261.
Socie, D. F., Marquis, G. B., 2000. Multiaxial fatigue. Warrendale, Pa: Handbook, Society of Automotive Engineers, ISBN 0-7680-0453-5.
Tina, C., Arindam, K. C., Arshad, N. S., Namrata, G., 2019. Effect of different dielectric fluids on material removal rate, surface roughness, kerf width, and microhardness. The Brazilian Society of Mechanical Sciences and Engineering. https://doi.org/10.1007/s40430-019-1845-1.
Yuichi, K., Kenji, T., Xin, Z., 2010. Computational investigation of a race car wing with vortex generators in ground effect. Journal of Fluids Engineering, 132, pp. 021102-1–021102-8. https://doi.org/10.1115/1.4000741
Zhao, W., Liu, X., 2017. Stress distribution and crack propagation in aircraft wings under variable loading conditions. International Journal of Structural Integrity, 8(2), pp. 193–204.