Fabrication and Impact Testing of Auxetic Material

Jake Howard


This paper will develop a testing method in order to justify whether or not auxetic materials should be considered for sports protective equipment and defence purposes. Fabrication processes of auxetic foam will be discussed throughout as well as their behaviours. Auxetic materials are characterised by the negative Poisson’s ratio which in layman’s terms means the material dilates in compression and expands under tension. Naturally occurring auxetic materials are rare to find but some examples are: rocks, minerals and the skin on cow’s teats. In comparison to conventional foam, auxetic material have been recorded to have several useful properties such as enhancement in indentation resistance, reduction of peak acceleration and a natural tendency to produce dome-like curvature under pure bending.

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