Triply-Twinned Metamaterials Turn Lattice Defects Into a Blueprint for Stronger Structures (opens in new tab)

Triply-twinned body-centred cubic lattices shift strut-scale deformation from bending to stretching, producing major gains in stiffness and strength across polymer and titanium metamaterials. High-resolution synchrotron XCT revealed that lattice architecture governs global shear-band failure, while additive manufacturing defects mainly determine where local fractures begin.