Effect of Material Coupling on Wave Vibration of Composite Timoshenko Beams

[+] Author and Article Information
C. Mei

Department of Mechanical Engineering, The University of Michigan-Dearborn, 4901 Evergreen Road, Dearborn, MI 48128cmei@umich.edu

J. Vib. Acoust 127(4), 333-340 (Oct 06, 2004) (8 pages) doi:10.1115/1.1924641 History: Received May 14, 2004; Revised October 06, 2004

This paper presents the effect of coupling between bending and torsional deformations on vibrations of composite Timoshenko beams from the wave standpoint. The dispersion characteristics and the modes of vibrations are in general affected by material coupling, except those of the torsional modes at low frequencies; and higher-frequency modes are normally more sensitive to material coupling. The wave mode transition phenomenon is also investigated. It is found that like their metallic counterparts, composite Timoshenko beams also exhibit wave mode transition. Furthermore, the transition frequency is found to be unaffected by material coupling. Numerical examples for which comparative results are available in the literature are presented.

Copyright © 2005 by American Society of Mechanical Engineers
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Figure 1

Uniform composite beam with unbalanced layup

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Figure 2

Definition of positive shear force, torque, and bending moment

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Figure 3

(a) Bending propagating waves with (̱) and without (ooo) coupling. (b) Bending decaying waves with (̱) and without (ooo) coupling. (c) Torsional propagating waves with (̱) and without (ooo) coupling.

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Figure 4

Wave propagation

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Figure 5

Wave reflection at a general boundary

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Figure 6

A uniform beam structure with boundaries A and B

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Figure 7

Magnitude responses of characteristic polynomial of Eqs. 41 (left) and 47 (right)

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Figure 8

Real and imaginary responses of characteristic polynomial of Eqs. 41 (left) and 47 (right)

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Figure 9

Mode shapes. (a) Rigid body mode, (b) first coupled mode, (c) second coupled mode, (d) third coupled mode, (e) Pure torsional mode, (f) fourth coupled mode



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