# Hierarchical space frames for high mechanical efficiency: Fabrication and mechanical testing

D. Rayneau-Kirkhope, Y. Mao, R. Farr, J. Segal

*Mechanics Research Communications* 46, 41 (2012)

#fractalstructures#fractals#mechanics

Fractal structures.

It has been demonstrated theoretically that under certain loading conditions hierarchical structures hold a distinct advantage in efficiency over more conventional designs. Here a particular hierarchical design is studied, and we show that the power-law scaling relations between loading parameters and volume of material required to make a stable structure can be varied systematically. Through computer simulation, we construct mechanism diagrams depicting likely failure modes for a given geometry, which give insight into the optimisation. Using rapid prototyping technologies, the same structure is fabricated and mechanical testing undertaken; the results are compared to theoretical and finite element models.

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