Evaluation of Thermal and Mechanical Filler Gas Influence on Honeycomb Structures Behavior |
| Journal |
Materials Science Forum (Volume 553) |
| Volume |
Diffusion in Solids and Liquids II |
| Edited by |
Andreas Öchsner and José Grácio |
| Pages |
190-195 |
| DOI |
10.4028/www.scientific.net/MSF.553.190 |
| Online since |
August, 2007 |
| Authors |
Matej Vesenjak, Andreas Öchsner, Zoran Ren |
| Keywords |
Dynamic Loading, Filler Influence, Gas, Honeycomb Structure, Thermal and Mechanical Properties |
| Abstract |
In this paper the behavior of hexagonal honeycombs under dynamic in-plane loading is
described. Additionally, the presence and influence of the filler gas inside the honeycomb cells is
considered. Such structures are subjected to very large deformation during an impact, where the
filler gas might strongly affect their behavior and the capability of deformational energy absorption,
especially at very low relative densities. The purpose of this research was therefore to evaluate the
influence of filler gas on the macroscopic cellular structure behavior under dynamic uniaxial
loading conditions by means of computational simulations. The LS-DYNA code has been used for
this purpose, where a fully coupled interaction between the honeycomb structure and the filler gas
was simulated. Different relative densities, initial pore pressures and strain rates have been
considered. The computational results clearly show the influence of the filler gas on the
macroscopic behavior of analyzed honeycomb structures. Because of very large deformation of the
cellular structure, the gas inside the cells is also enormously compressed which results in very high
gas temperatures and contributes to increased crash energy absorption capability. The evaluated
results are valuable for further research considering also the heat transfer in honeycomb structures
and for investigations of variation of the base material mechanical properties due to increased gas
temperatures under impact loading conditions. |
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