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TECHNICAL PAPERS

Free Vibration of Thermally Buckled Composite Sandwich Plates

[+] Author and Article Information
Le-Chung Shiau1

Department of Aeronautics and Astronautics, National Cheng Kung University, Tainan, Taiwan, 70101lcshiau@mail.ncku.edu.tw

Shih-Yao Kuo

Department of Flight Service Management, Aletheia University, Tainan, Taiwan

1

To whom correspondence should be addressed.

J. Vib. Acoust 128(1), 1-7 (Jun 03, 2005) (7 pages) doi:10.1115/1.2149388 History: Received July 13, 2004; Revised June 03, 2005

A high precision triangular plate element is developed for the free vibration analysis of thermally buckled composite sandwich plates. Due to an uneven thermal expansion in the two principal material directions, the buckling mode of the plate may change from one pattern to another in the postbuckling region for certain fiber orientation and aspect ratio of the plate. Because of this buckle pattern change, the sequence of natural frequencies of the plate is also suddenly altered. By examining the buckling and free vibration modes of the plate, a clear picture of buckle pattern change and vibration mode shifting is presented. Numerical results show that if the shape of a free vibration mode is similar to the plate buckling mode then the natural frequency of that mode will drop to zero when the temperature reaches the buckling temperature.

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Copyright © 2006 by American Society of Mechanical Engineers
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References

Figures

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Figure 1

Geometry of a rectangular composite sandwich panel

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Figure 2

Global/local coordinate systems for a 72 density-of-freedom triangular plate element

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Figure 3

Natural frequencies for [+45∕−45∕+45] square laminates

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Figure 4

Natural frequencies for [(0∕90)2∕core]s square composite sandwich plate

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Figure 5

Natural frequencies for [(0∕90)2∕core]s composite sandwich plate (a∕b=2)

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Figure 6

Natural frequencies for [(0∕90)2∕core]s composite sandwich plate (a∕b=3)

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Figure 7

Boundary of first vibration mode shape for [(±θ)2∕core]s square sandwich plates

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Figure 8

Natural frequencies for [(±60)2∕core]s square composite sandwich plate

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Figure 9

Contour plot of fundamental mode for [(±60)2∕core]s square composite sandwich plate

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Figure 10

Natural frequencies for [(±75)2∕core]s square composite sandwich plate

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