Fundamental Frequencies of Elliptical Composite Cylinders with Circumferentially Varying Fiber Orientation

The fundamental vibration frequencies of thin-walled elliptical composite cylinders for which the fiber orientations in some or all of the layers vary linearly with circumferential location are discussed. The study is motivated by previous work that demonstrated that a circumferentially varying fibe...

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Bibliographic Details
Published in:AIAA journal 2012-04, Vol.50 (4), p.928-937
Main Authors: Lo, Hung-Chieh, Hyer, Michael W
Format: Article
Language:English
Subjects:
Aerospace engineering
Buckling
Circular cylinders
Circumferences
Cross sections
Cylinders
Exact sciences and technology
Fiber optics
Fiber orientation
Finite element analysis
Frequencies
Fundamental areas of phenomenology (including applications)
Geometry
Physics
Position (location)
Resonant frequency
Solid mechanics
Structural and continuum mechanics
Vibration
Vibration analysis
Vibration, mechanical wave, dynamic stability (aeroelasticity, vibration control...)
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Summary:The fundamental vibration frequencies of thin-walled elliptical composite cylinders for which the fiber orientations in some or all of the layers vary linearly with circumferential location are discussed. The study is motivated by previous work that demonstrated that a circumferentially varying fiber orientation scheme can be used to improve the axial buckling capacity of an elliptical composite cylinder. At issue then is the degree to which fundamental frequencies are influenced by the circumferentially varying fiber orientation. Circular cylinders are also considered, so an additional finding of the study is the influence of cylinder cross-sectional geometry on the fundamental vibration frequency, with all other cylinder geometric and material parameters remaining the same. The results, which are based on finite element models of the elliptical and circular cylinders, indicate that, even for what is considered a significant range of fiber orientations that vary linearly with circumferential location, the fundamental frequencies of both elliptical and circular cylinders are not significantly influenced. On the other hand, the circumferential wave numbers are influenced. The frequency results for circular cylinders are substantiated by the work of other researchers. [PUBLICATION ABSTRACT]
ISSN:0001-1452
1533-385X
DOI:10.2514/1.J051406