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Research Papers: Design and Analysis

Equivalent Elastic Constants of Truss Core Sandwich Plates

[+] Author and Article Information
Hong-Xia Wang

School of Naval Architecture, Ocean and Civil Engineering, Shanghai JiaoTong University, Shanghai 200030, P.R. China

Samuel W. Chung1

School of Architecture, University of Utah, Salt Lake City, UT 84112samchung@aol.com

1

Corresponding author.

J. Pressure Vessel Technol 133(4), 041203 (May 11, 2011) (6 pages) doi:10.1115/1.4003473 History: Received November 08, 2010; Revised December 10, 2010; Published May 11, 2011; Online May 11, 2011

A plate structure of a triangular truss core sandwiched by two panels is treated as an equivalent homogeneous laminated plate by obtaining equivalent anisotropic elastic constants. The equivalent elastic constants are obtained by considering generalized Hook’s law of a three dimensional elastic body with no a priori assumption and the equilibrium of a segment deformed by bending moments. To verify the accuracy of the equivalent elastic constants, a linear static analysis of sandwiched aluminum plates subjected to lateral pressure is carried out. The results of the finite element analysis applied to the equivalent laminated plates are compared with those of a NASTRAN analysis of the original structural layouts. The results are also compared with a closed-form solution, which simplifies the sandwiched plate as a homogeneous orthotropic thick plate continuum (Lok and Cheng, 2000, “Elastic Stiffness Properties and Behavior of Truss-Core Sandwich Panel,” J. Struct. Eng., 126(5), pp. 552–559). As the maximum deflections of three analyses agreed closely, one has assurance that the method of the homogeneous plate with equivalent elastic constants is valid and useful.

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Copyright © 2011 by American Society of Mechanical Engineers
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Figures

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Figure 1

Geometry of triangular truss core sandwich plates

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Figure 2

Inclined stiffener under horizontal load

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Figure 3

Inclined stiffener under vertical load

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Figure 4

Transverse shear deflection of triangular truss core unit element

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Figure 5

Geometry of example sandwich plate

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Figure 6

The FE model of original sandwich plate

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