TY  - JOUR
T1  - The Influence of Axial Compression on the Free Vibration Frequencies of Cross-ply Laminated and Moderately Thick Cylinders
TT  - The Influence of Axial Compression on the Free Vibration Frequencies of Cross-ply Laminated and Moderately Thick Cylinders
AU  - Çağdaş, İzzet Ufuk
PY  - 2020
DA  - March
DO  - 10.2339/politeknik.447210
JF  - Politeknik Dergisi
PB  - Gazi University
WT  - DergiPark
SN  - 2147-9429
SP  - 45
EP  - 52
VL  - 23
IS  - 1
LA  - en
AB  - In this study, the free vibration behavior of axiallycompressed cross-ply laminated composite cylinders is investigated using asemi-analytical shell finite element based on a consistent first order sheardeformable shell theory, which includes the influences of rotatory inertia andthickness coordinate/radius ratio. First, a verification study is conducted tovalidate the axisymmetric shell finite element used in this study and, for thenon-compressed cases, the free vibration frequencies obtained using the finiteelement developed are found out to be in excellent agreement with the publishedresults found in the literature. The same element is also validated forfirst-ply failure analysis and good agreement is observed with the first-plyfailure loads obtained using a shear deformable and curved shell element. Then,numerical results for free vibration analyses are presented for axiallycompressed composite cylinders having different boundary conditions and forwhich the level of axial compression is kept below the corresponding linearbuckling and first ply failure loads. It is observed that, the fundamental freevibration frequencies decrease sharply for axial load levels higher than about60~80% of the buckling loads of the cylindrical structures considered. It isalso determined that the first-ply failure load is lower than the buckling loadfor some of the thicker cylinders.
KW  - composite cylinder
KW  - finite elements
KW  - compression
KW  - Vibration
KW  - buckling
N2  - Inthis study, the free vibration behavior of axially compressed cross-plylaminated composite cylinders is investigated using a semi-analytical shellfinite element based on a consistent first order shear deformable shell theory,which includes the influences of rotatory inertia and thicknesscoordinate/radius ratio. First, a verification study is conducted to validatethe axisymmetric shell finite element used in this study and, for thenon-compressed cases, the free vibration frequencies obtained using the finiteelement developed are found out to be in excellent agreement with the publishedresults found in the literature. The same element is also validated forfirst-ply failure analysis and good agreement is observed with the first-plyfailure loads obtained using a shear deformable and curved shell element. Then,numerical results for free vibration analyses are presented for axiallycompressed composite cylinders having different boundary conditions and forwhich the level of axial compression is kept below the corresponding linearbuckling and first ply failure loads. It is observed that, the fundamental freevibration frequencies decrease sharply for axial load levels higher than about60~80% of the buckling loads of the cylindrical structures considered. It isalso determined that the first-ply failure load is lower than the buckling loadfor some of the thicker cylinders.
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UR  - https://doi.org/10.2339/politeknik.447210
L1  - https://dergipark.org.tr/en/download/article-file/652364
ER  -