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## trenThe Influence of Axial Compression on the Free Vibration Frequencies of Cross-ply Laminated and Moderately Thick CylindersThe Influence of Axial Compression on the Free Vibration Frequencies of Cross-ply Laminated and Moderately Thick Cylinders

#### İzzet Ufuk ÇAĞDAŞ [1]

In this study, the free vibration behavior of axially compressed cross-ply laminated composite cylinders is investigated using a semi-analytical shell finite element based on a consistent first order shear deformable shell theory, which includes the influences of rotatory inertia and thickness coordinate/radius ratio. First, a verification study is conducted to validate the axisymmetric shell finite element used in this study and, for the non-compressed cases, the free vibration frequencies obtained using the finite element developed are found out to be in excellent agreement with the published results found in the literature. The same element is also validated for first-ply failure analysis and good agreement is observed with the first-ply failure loads obtained using a shear deformable and curved shell element. Then, numerical results for free vibration analyses are presented for axially compressed composite cylinders having different boundary conditions and for which the level of axial compression is kept below the corresponding linear buckling and first ply failure loads. It is observed that, the fundamental free vibration frequencies decrease sharply for axial load levels higher than about 60~80% of the buckling loads of the cylindrical structures considered. It is also determined that the first-ply failure load is lower than the buckling load for some of the thicker cylinders.

In this study, the free vibration behavior of axially compressed cross-ply laminated composite cylinders is investigated using a semi-analytical shell finite element based on a consistent first order shear deformable shell theory, which includes the influences of rotatory inertia and thickness coordinate/radius ratio. First, a verification study is conducted to validate the axisymmetric shell finite element used in this study and, for the non-compressed cases, the free vibration frequencies obtained using the finite element developed are found out to be in excellent agreement with the published results found in the literature. The same element is also validated for first-ply failure analysis and good agreement is observed with the first-ply failure loads obtained using a shear deformable and curved shell element. Then, numerical results for free vibration analyses are presented for axially compressed composite cylinders having different boundary conditions and for which the level of axial compression is kept below the corresponding linear buckling and first ply failure loads. It is observed that, the fundamental free vibration frequencies decrease sharply for axial load levels higher than about 60~80% of the buckling loads of the cylindrical structures considered. It is also determined that the first-ply failure load is lower than the buckling load for some of the thicker cylinders.

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Primary Language en Engineering Research Article Orcid: 0000-0002-2528-2978Author: İzzet Ufuk ÇAĞDAŞ (Primary Author)Institution: AKDENİZ ÜNİVERSİTESİ, MÜHENDİSLİK FAKÜLTESİCountry: Turkey Publication Date : March 1, 2020
 Bibtex @research article { politeknik447210, journal = {Politeknik Dergisi}, issn = {}, eissn = {2147-9429}, address = {Gazi Üniversitesi Teknoloji Fakültesi 06500 Teknikokullar - ANKARA}, publisher = {Gazi University}, year = {2020}, volume = {23}, pages = {45 - 52}, doi = {10.2339/politeknik.447210}, title = {The Influence of Axial Compression on the Free Vibration Frequencies of Cross-ply Laminated and Moderately Thick Cylinders}, key = {cite}, author = {ÇAĞDAŞ, İzzet Ufuk} } APA ÇAĞDAŞ, İ . (2020). The Influence of Axial Compression on the Free Vibration Frequencies of Cross-ply Laminated and Moderately Thick Cylinders. Politeknik Dergisi , 23 (1) , 45-52 . DOI: 10.2339/politeknik.447210 MLA ÇAĞDAŞ, İ . "The Influence of Axial Compression on the Free Vibration Frequencies of Cross-ply Laminated and Moderately Thick Cylinders". Politeknik Dergisi 23 (2020 ): 45-52 Chicago ÇAĞDAŞ, İ . "The Influence of Axial Compression on the Free Vibration Frequencies of Cross-ply Laminated and Moderately Thick Cylinders". Politeknik Dergisi 23 (2020 ): 45-52 RIS TY - JOUR T1 - The Influence of Axial Compression on the Free Vibration Frequencies of Cross-ply Laminated and Moderately Thick Cylinders AU - İzzet Ufuk ÇAĞDAŞ Y1 - 2020 PY - 2020 N1 - doi: 10.2339/politeknik.447210 DO - 10.2339/politeknik.447210 T2 - Politeknik Dergisi JF - Journal JO - JOR SP - 45 EP - 52 VL - 23 IS - 1 SN - -2147-9429 M3 - doi: 10.2339/politeknik.447210 UR - https://doi.org/10.2339/politeknik.447210 Y2 - 2019 ER - EndNote %0 Politeknik Dergisi The Influence of Axial Compression on the Free Vibration Frequencies of Cross-ply Laminated and Moderately Thick Cylinders %A İzzet Ufuk ÇAĞDAŞ %T The Influence of Axial Compression on the Free Vibration Frequencies of Cross-ply Laminated and Moderately Thick Cylinders %D 2020 %J Politeknik Dergisi %P -2147-9429 %V 23 %N 1 %R doi: 10.2339/politeknik.447210 %U 10.2339/politeknik.447210 ISNAD ÇAĞDAŞ, İzzet Ufuk . "The Influence of Axial Compression on the Free Vibration Frequencies of Cross-ply Laminated and Moderately Thick Cylinders". Politeknik Dergisi 23 / 1 (March 2020): 45-52 . https://doi.org/10.2339/politeknik.447210 AMA ÇAĞDAŞ İ . The Influence of Axial Compression on the Free Vibration Frequencies of Cross-ply Laminated and Moderately Thick Cylinders. Politeknik Dergisi. 2020; 23(1): 45-52. Vancouver ÇAĞDAŞ İ . The Influence of Axial Compression on the Free Vibration Frequencies of Cross-ply Laminated and Moderately Thick Cylinders. Politeknik Dergisi. 2020; 23(1): 52-45.

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