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Effect of cell-size on the energy absorption features of closed-cell aluminium foams
Nammi, Sathish K. Edwards, Gerard Shirvani, Hassan
Nammi, Sathish K.
Edwards, Gerard
Shirvani, Hassan
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2016-07-02
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Abstract
The effect of cell-size on the compressive response and energy absorption features of closed-cell aluminium (Al) foam were investigated by finite element method. Micromechanical models were constructed with a repeating unit-cell (RUC) which was sectioned from tetrakaidecahedra structure. Using this RUC, three Al foam models with different cell-sizes (large, medium and small) and all of same density, were built. These three different cell-size pieces of foam occupy the same volume and their domains contained 8, 27 and 64 RUCs respectively. However, the smaller cell-size foam has larger surface area to volume ratio compared to other two. Mechanical behaviour was modelled under uniaxial loading. All three aggregates (3D arrays of RUCs) of different cell-sizes showed an elastic region at the initial stage, then followed by a plateau, and finally, a densification region. The smaller cell size foam exhibited a higher peak-stress and a greater densification strain comparing other two cell-sizes investigated. It was demonstrated that energy absorption capabilities of smaller cell-size foams was higher compared to the larger cell-sizes examined.
Citation
Nammi, S. K., Edwards, G., & Shirvani, H. (2016). Effect of cell-size on the energy absorption features of closed-cell aluminium foams. Acta Astronautica, 128, 243-50.
Publisher
Elsevier
Journal
Acta Astronautica
Research Unit
DOI
10.1016/j.actaastro.2016.06.047
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PubMed Central ID
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Article
Language
en
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ISSN
0094-5765