Metamaterial first to achieve theoretical performance

In a letter published in the journal Nature Jonathan Berger, Robert McMeeking and Haydn N. G. Wadley prove that the three-dimensional pyramid-and-cross cell geometry Berger conceived is the first of its kind to achieve the performance predicted by theoretical bounds. Its lightness, strength and versatility lends itself well to a variety of applications, from buildings to vehicles to packaging and transport.
Instead of the typical assemblage of bubbles or a honeycomb arrangement, the ordered cells were set apart by walls forming the shapes of pyramids with three sides and a base, and octahedra, reinforced inside with a “cross” of intersecting diagonal walls (UCSB, 19 February 2017).
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