Effect of cell-size on the energy absorption features of closed-cell aluminium foams

Nammi, Sathish K. and Edwards, Gerard and Shirvani, Hassan (2016) Effect of cell-size on the energy absorption features of closed-cell aluminium foams. Acta Astronautica, 128. pp. 243-250. ISSN 0094-5765

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Official URL: http://doi.org/10.1016/j.actaastro.2016.06.047

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.

Item Type: Journal Article
Keywords: Aluminium foam, Cell-size, Energy absorption, Repeating unit-cell, Micromechanical
Faculty: ARCHIVED Faculty of Science & Technology (until September 2018)
Depositing User: Unnamed user with email sathish.nammi@anglia.ac.uk
Date Deposited: 04 Aug 2016 11:28
Last Modified: 09 Sep 2021 19:00
URI: https://arro.anglia.ac.uk/id/eprint/700657

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