An example of the generation-2 structure that the researchers built in the lab, which could be used as a scaffold. Due to manufacturing limitations, the scaffolding here is made of solid rather than hollow beams. (Courtesy: Yong Mao, D Rayneau-Kirkhope et al.)

Ultralight fractal structures could bear heavy loads

Nov 27, 2012

A team of researchers in Europe has shown that the density of large structures can be dramatically reduced, if they are designed using a fractal pattern. The researchers have worked out a way to calculate an optimal “hierarchal structure” built from a certain material so that it can withstand a given load. They claim that using such techniques could help in building highly efficient load-bearing structures that could be used in solar sails, cranes or other lightweight-yet-strong constructs.

A fractal is an object or a structure that is self-similar on all length scales. Fractal patterns are seen in nature at all scales – everything from a single fern leaf that resembles the entire plant, to clouds, snowflakes, blood vessels and cauliflowers shows a fractal pattern. A particular example that inspired this latest work is trabecular bone – the “spongy” bone that is found near joints in the human body. This bone has a sponge-like network of fibres that have a pseudo-fractal pattern, whereby the pattern is almost self-similar across a few scales. This makes the bone strong but light and capable of providing the necessary strength and stiffness.

Read more: Ultralight fractal structures could bear heavy loads – physics world.

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