Auxetic lattice
thingiverse
This is the model of an auxetic lattice (modeller: M Williams). This kind of lattices has a negative Poissons ratio. This means, when they are stretched in one direction, it expands in the other direction. This is completely opposite to conventional materials. This model can be printed and tested using a tension testing machine. More for information, you can read our technical paper: http://engweb.swan.ac.uk/~adhikaris/fulltext/journal/ft262.pdf
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