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Advances in Nano Research Volume 16, Number 5, May 2024 , pages 445-458 DOI: https://doi.org/10.12989/.2024.16.5.445 |
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Static stability and vibration response of rotating carbon-nanotube-reinforced composite beams in thermal environment |
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Özge Özdemir, Hüseyin Ural and Alexandre de Macêdo Wahrhaftig
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| Abstract | ||
| The objective of this paper is to present free vibration and static stability analyses of rotating composite beams reinforced with carbon nanotubes (CNTs) under uniform thermal loads. Beam structural equations and CNT-reinforced composite (CNTRC) beam formulations are derived based on Timoshenko beam theory (TBT). The temperature-dependent properties of the beam material, such as the elastic modulus, shear modulus, and material density, are assumed to vary over the thickness according to the rule of mixture. The beam material is modeled as a mixture of single-walled carbon nanotubes (SWCNTs) in an isotropic matrix. The SWCNTs are aligned and distributed in the isotropic matrix with different patterns of reinforcement, namely the UD (uniform), FG-O, FG-V, FG-Λ and FG-X distributions, where FG-V and FG-Λ are asymmetric patterns. Numerical examples are presented to illustrate the effects of several essential parameters, including the rotational speed, hub radius, effective material properties, slenderness ratio, boundary conditions, thermal force, and moments due to temperature variation. To the best of the authors' knowledge, this study represents the first attempt at the finite element modeling of rotating CNTRC Timoshenko beams under a thermal environment. The results are presented in tables and figures for both symmetric and asymmetric distribution patterns, and can be used as benchmarks for further validation. | ||
| Key Words | ||
| carbon-nanotube-reinforced composite beam; finite element method; stability analysis; thermal analysis; vibration analysis | ||
| Address | ||
| Özge Özdemir and Hüseyin Ural: Department of Aeronautical Engineering, Istanbul Technical University, 34469, Maslak, Istanbul, Turkiye Alexandre de Macêdo Wahrhaftig: Department of Construction and Structures, Polytechnic School, Federal University of Bahia, BA, Brazil | ||