Behaviour of Cellular Structures under Impact Loading a Computational Study |
| Journal |
Materials Science Forum (Volume 566) |
| Volume |
Explosion, Shock Wave and Hypervelocity Phenomena |
| Edited by |
S. Itoh and K. Hokamoto |
| Pages |
53-60 |
| DOI |
10.4028/www.scientific.net/MSF.566.53 |
| Online since |
November, 2007 |
| Authors |
Zoran Ren,
Matej Vesenjak,
Andreas Öchsner
|
| Keywords |
Cellular Structures, Computational Modelling, Finite Element Analysis (FEA), Impact Loading, Pore Fluid Filler, Pore Gas Filler |
| Abstract |
New multiphysical computational models for simulation of regular open and closed-cell
cellular structures behaviour under compressive impact loading are presented. The behaviour of
cellular structures with fluid fillers under uniaxial impact loading and large deformations has been
analyzed with the explicit nonlinear finite element code LS-DYNA. The behaviour of closed-cell
cellular structure has been evaluated with the use of the representative volume element, where the
influence of residual gas inside the closed pores has been studied. Open-cell cellular structure was
modelled as a whole to properly account for considered fluid flow through the cells, which
significantly influences macroscopic behaviour of cellular structure. The fluid has been modelled by
applying a Smoothed Particle Hydrodynamics (SPH) method. Computational simulations showed
that the base material has the highest influence on the behaviour of cellular structures under impact
conditions. The increase of the relative density and strain rate results in increase of the cellular
structure stiffness. Parametrical numerical simulations have also confirmed that filler influences the
macroscopic behaviour of the cellular structures which depends on the loading type and the size of
the cellular structure. In open-cell cellular structures with higher filler viscosity and higher relative
density, increased impact energy absorption has been observed. |
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