Human-made metamaterials with messy internal designs may be more resistant to damage than those with neatly patterned structures.
Metamaterial lattices, usually composed of struts that form identical, repeating “unit cells,” can exhibit properties that normal solids don’t (SN: 1/19/19, p. 5). But under heavy loads, overstressed struts can collapse, and that breakage quickly splinters through the whole grid, causing it to crumble.
Materials scientist Minh-Son Pham of Imperial College London and colleagues realized that this kind of collapse is similar to the way metallic crystals with atoms arranged in identical unit cells deform under heavy loads. In these materials, defects in the crystal can travel freely through its atomic lattice like dominoes falling in a row, weakening the crystal (SN: 9/11/10, p. 22).
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