Free Vibration of Axially Loaded Composite Beams using a Quasi-3D Theory

Vo, Thuc and Banerjee, Ranjan (2015) Free Vibration of Axially Loaded Composite Beams using a Quasi-3D Theory. Civil-Comp Proceedings. p. 108. ISSN 1759-3433

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This paper deals with free vibration behaviour of axially loaded composite beams with arbitrary lay-ups by using a quasi-3D theory, which accounts for shear and normal deformation effects as well as coupling effects arising from the material anisotropy. The axial and transverse displacement variations are assumed to be cubic and quadratic functions of the depth, respectively. Using an assumed displacement field, the governing differential equations of motion are derived by applying Hamilton's principle. A two-node C1 finite element with six degree-of-freedom at each node is developed to solve the free vibration problem. Numerical results are obtained for representative composite beams and the effects of fiber orientation on the natural frequencies and mode shapes are demonstrated. An elastic buckling analysis is also carried out as a degenerate case of free vibration analysis at zero frequency. In order to achieve this, a compressive axial load in the beam is gradually increased so that the natural frequencies decrease and in doing so, there comes a stage when for a particular high value of compressive load, the beam becomes unstable and buckling occurs as a degenerate case of free vibration at zero frequency. The load-frequency curves and the corresponding mode shapes are illustrated. The results are discussed and the paper concludes with some important remarks.

Item Type: Article
Uncontrolled Keywords: composite beams, vibration, buckling, finite element, quasi-3D theory
Subjects: H200 Civil Engineering
H300 Mechanical Engineering
Department: Faculties > Engineering and Environment > Mechanical and Construction Engineering
Depositing User: Becky Skoyles
Date Deposited: 12 May 2016 09:46
Last Modified: 12 Oct 2019 22:52

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