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Research Papers

A Study for the Influence of Work Hardening on Bending Stiffness of Truss Core Panel

[+] Author and Article Information
Sunao Tokura

Engineering Division, JSOL, 2-5-24, Harumi, Chuo-ku, Tokyo 104-0053, Japantokura.sunao@jsol.co.jp

Ichiro Hagiwara

Department of Mechanical Sciences and Engineering and Graduate School of Science and Engineering, Tokyo Institute of Technology, 2-21-1, O-okayama, Meguro-ku, Tokyo 152-8552, Japan

J. Appl. Mech 77(3), 031010 (Feb 08, 2010) (6 pages) doi:10.1115/1.4000419 History: Received December 11, 2008; Revised July 17, 2009; Published February 08, 2010; Online February 08, 2010

Honeycomb panel is widely used as flooring or wall material in various structures, e.g., buildings, aircraft, flooring members of railway car, and so on, due to high stiffness and lightness at present. Honeycomb panel, however, has a disadvantage that the adhesive used to glue honeycomb core and top plate may burn by fire. On the other hand, truss core panel has equivalent stiffness as honeycomb panel and is expected to be an alternative to honeycomb panel as it is safer for fire. To replace honeycomb panel with truss core panel, it is necessary to investigate the stiffness of truss core panel for bending, shear, compression, and so on. The bending case with a three-point bending model of truss core panel is chosen here. Four cases of analysis with/without work hardening effect and thickness change using two types of shell formulation are performed. These cases are compared with an equivalent honeycomb model. The study showed the effect of work hardening is very important to assess bending stiffness of truss core panel. It is also observed that the use of suitable shell formulation is necessary to obtain reliable result. In addition, the truss core panel shows bending stiffness comparable with conventional honeycomb panel.

Copyright © 2010 by American Society of Mechanical Engineers
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References

Figures

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Figure 2

Combination pattern of lower and upper truss core panels

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Figure 3

Multistage forming model

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Figure 4

Stress-plastic strain curve (SPCE)

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Figure 5

Final result of multistage forming process with thickness reduction (%)

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Figure 6

Final geometry of formed blank and trim line

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Figure 7

Mesh density of forming mesh (1.2 mm) and bending mesh (5 mm) and mapping algorithm

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Figure 8

Definition of spotweld using beam element

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Figure 1

Typical geometry and dimensions of truss core panel

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Figure 9

Truss core panel model configuration for bending analysis

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Figure 10

Honeycomb cell structure and dimensions

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Figure 11

Comparison of analysis and experiment

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Figure 12

Transformation of truss core to honeycomb

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Figure 13

Honeycomb model (upper plate invisible)

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Figure 14

Deformation and von Mises stress distribution on truss core panel

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Figure 15

Force-stroke curve

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Figure 16

Dark elements have warpage of over 5 deg

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