Modeling of Nomex® Honeycomb Cores, Linear and Nonlinear Behaviors

The purpose of this study is to develop tools dedicated to the design of sandwich panels involving Nomex® honeycomb cores. Special attention is paid to the ability to perform full three dimensional calculations up to failure of such structures. In the first part, the determination of effective elast...

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Bibliographic Details
Published in:Mechanics of advanced materials and structures 2007-11, Vol.14 (8), p.589-601
Main Authors: Gornet, L., Marguet, S., Marckmann, G.
Format: Article
Language:English
Subjects:
Engineering Sciences
failure
homogenization
Mechanics
Mechanics of materials
Nomex® honeycomb core
nonlinear behavior
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Summary:The purpose of this study is to develop tools dedicated to the design of sandwich panels involving Nomex® honeycomb cores. Special attention is paid to the ability to perform full three dimensional calculations up to failure of such structures. In the first part, the determination of effective elastic properties of Nomex® honeycomb cores is carried out thanks to strain based periodic homogenization technique. Using an equivalence in energy between a real honeycomb and a fictitious continuous medium, it becomes possible to evaluate the elastic behavior of Nomex® cores, starting from the knowledge of the behavior of the constitutive paper. Next, relying on experimental observations, the strengths of Nomex® honeycomb cores are evaluated with a linear Euler's buckling analysis. Results are compared with data coming from manufacturers, and give satisfaction. In order to carry out these two first studies, the NidaCore software has been developed using the finite element code Cast3M from CEA. The last part deals with the modeling of the nonlinear compressive response of Nomex® cores. A model based on the thermodynamics of irreversible process is proposed and the identification technique detailed. Good agreement between experimental data and computed values is obtained.
ISSN:1537-6494
1537-6532
DOI:10.1080/15376490701675370