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Journal of Computing and Information Science in Engineering | Volume 10 | Issue 4 | Research Paper
Research Papers

Dual Representation Methods for Efficient and Automatable Analysis of 3D Plates

[+] Author and Article Information
Vikalp Mishra

Department of Mechanical Engineering, University of Wisconsin-Madison, 1513 Univeristy Avenue, Madison, WI 53706

Krishnan Suresh

Department of Mechanical Engineering, University of Wisconsin-Madison, 1513 Univeristy Avenue, Madison, WI 53706suresh@engr.wisc.edu

J. Comput. Inf. Sci. Eng 10(4), 041002 (Nov 23, 2010) (11 pages) doi:10.1115/1.3510587 History: Received September 10, 2009; Revised July 03, 2010; Published November 23, 2010; Online November 23, 2010
Article
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It is well recognized that 3D finite element analysis is inappropriate for analyzing thin structures such as plates and shells. Instead, a variety of highly efficient and specialized 2D methods have been developed for analyzing such structures. However, 2D methods pose serious automation challenges in today’s 3D design environment. Specifically, analysts must manually extract cross-sectional properties from a 3D computer aided design (CAD) model and import them into a 2D environment for analysis. In this paper, we propose two efficient yet easily automatable dual representation methods for analyzing thin plates. The first method exploits standard off-the-shelf 3D finite element packages and achieves high computational efficiency through an algebraic reduction process. In the reduction process, a 3D plate bending stiffness matrix is constructed from a 3D mesh and then projected onto a lower-dimensional space by appealing to standard 2D plate theories. In the second method, the analysis is carried out by integrating 2D shape functions over the boundary of the 3D plate. Both methods do not entail extraction of the cross-sectional properties of the plate. However, the user must identify the plate or thickness direction. The proposed methodologies are substantiated through numerical experiments.
Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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+A stiffened 3D plate structure
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A stiffened 3D plate structure
Figure 1

A stiffened 3D plate structure

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+The stiffened plate structure modeled in 2D
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The stiffened plate structure modeled in 2D
Figure 2

The stiffened plate structure modeled in 2D

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+A plate structure with additional features
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A plate structure with additional features
Figure 3

A plate structure with additional features

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+An illustrative clamped plate
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An illustrative clamped plate
Figure 4

An illustrative clamped plate

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+Eight-noded and 27-noded hexahedral elements
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Eight-noded and 27-noded hexahedral elements
Figure 5

Eight-noded and 27-noded hexahedral elements

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+Rectangular plate element
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Rectangular plate element
Figure 6

Rectangular plate element

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+A tetrahedral mesh of the plate structure
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A tetrahedral mesh of the plate structure
Figure 7

A tetrahedral mesh of the plate structure

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+Poor quality elements are acceptable
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Poor quality elements are acceptable
Figure 8

Poor quality elements are acceptable

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+A 2D geometry containing the projection of plate
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A 2D geometry containing the projection of plate
Figure 9

A 2D geometry containing the projection of plate

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+The 2D geometry discretized into quad elements
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The 2D geometry discretized into quad elements
Figure 10

The 2D geometry discretized into quad elements

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+A surface triangulation of the plate structure
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A surface triangulation of the plate structure
Figure 11

A surface triangulation of the plate structure

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+(a) Surface triangulation, (b) desired integration over quad element, and (c and d) triangulation of quad element
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(a) Surface triangulation, (b) desired integration over quad element, and (c and d) triangulation of quad element
Figure 12

(a) Surface triangulation, (b) desired integration over quad element, and (c and d) triangulation of quad element

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+Uniformly loaded plate with built-in edges
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Uniformly loaded plate with built-in edges
Figure 13

Uniformly loaded plate with built-in edges

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+3D tetrahedral mesh for uniformly loaded plate with built-in edges
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3D tetrahedral mesh for uniformly loaded plate with built-in edges
Figure 14

3D tetrahedral mesh for uniformly loaded plate with built-in edges

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+Surface triangulation for uniformly loaded plate with built-in edges
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Surface triangulation for uniformly loaded plate with built-in edges
Figure 15

Surface triangulation for uniformly loaded plate with built-in edges

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+Relative error in maximum deflection, for the plate in Fig. 1
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Relative error in maximum deflection, for the plate in Fig. 1
Figure 16

Relative error in maximum deflection, for the plate in Fig. 1

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+Mesh used by different methods
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Mesh used by different methods
Figure 17

Mesh used by different methods

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+Relative error in maximum deflection versus number of quad elements
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Relative error in maximum deflection versus number of quad elements
Figure 18

Relative error in maximum deflection versus number of quad elements

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+Uniformly loaded plate structures
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Uniformly loaded plate structures
Figure 19

Uniformly loaded plate structures

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+Deflected edge 1 of plate in Fig. 1
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Deflected edge 1 of plate in Fig. 1
Figure 20

Deflected edge 1 of plate in Fig. 1

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+Relative error in first six modal frequencies
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Relative error in first six modal frequencies
Figure 21

Relative error in first six modal frequencies

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+First six mode shapes for plate in Fig. 1
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First six mode shapes for plate in Fig. 1
Figure 22

First six mode shapes for plate in Fig. 1

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+Relative error in first modal frequency
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Relative error in first modal frequency
Figure 23

Relative error in first modal frequency

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+Rectangular plate with two longitudinal and two transverse stiffeners
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Rectangular plate with two longitudinal and two transverse stiffeners
Figure 24

Rectangular plate with two longitudinal and two transverse stiffeners

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+Relative error in modal frequencies
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Relative error in modal frequencies
Figure 25

Relative error in modal frequencies

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