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Article

Design of Circular Composite Cylinders for Optimal Natural Frequencies

Max Planck Institute for Intelligent Systems, Heisenbergstr. 3, 70569 Stuttgart, Germany
Academic Editor: Sylwester Samborski
Materials 2021, 14(12), 3203; https://doi.org/10.3390/ma14123203
Received: 12 May 2021 / Revised: 6 June 2021 / Accepted: 8 June 2021 / Published: 10 June 2021
(This article belongs to the Special Issue Advances in Fiber-Reinforced Polymer Composites)
This study concerns optimizing the eigenfrequencies of circular cylindrical laminates. The stiffness properties are described by lamination parameters to avoid potential solution dependency on the initial assumptions of the laminate configurations. In the lamination parameter plane, novel response contours are obtained for the first and second natural frequencies as well as their difference. The influence of cylinder length, radius, thickness, and boundary conditions on the responses is investigated. The lamination parameters yielding the maximum response values are determined, and the first two mode shapes are shown for the optimum points. The results demonstrate that the maximum fundamental frequency points of the laminated cylinders mostly lie at the inner lamination parameter domain, unlike the singly curved composite panels. In addition, the second eigenfrequency shows a nonconvex response surface containing multiple local maxima for several cases. Moreover, the frequency difference contours appear as highly irregular, which is unconventional for free vibration responses. View Full-Text
Keywords: composite cylinders; stiffness tailoring; lamination parameters; free vibration modes; eigenfrequency separation; optimization composite cylinders; stiffness tailoring; lamination parameters; free vibration modes; eigenfrequency separation; optimization
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MDPI and ACS Style

Serhat, G. Design of Circular Composite Cylinders for Optimal Natural Frequencies. Materials 2021, 14, 3203. https://doi.org/10.3390/ma14123203

AMA Style

Serhat G. Design of Circular Composite Cylinders for Optimal Natural Frequencies. Materials. 2021; 14(12):3203. https://doi.org/10.3390/ma14123203

Chicago/Turabian Style

Serhat, Gokhan. 2021. "Design of Circular Composite Cylinders for Optimal Natural Frequencies" Materials 14, no. 12: 3203. https://doi.org/10.3390/ma14123203

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