Gyrobifastigium-based TPMS lattices with tuneable stiffness and energy absorption

• Novel TPMS sheet lattices discovered with gyrobifastigium tiling • New topology shows high stiffness, strength, and energy absorption • Gyrobifastigium TPMS exhibit tetragonal elastic anisotropy • New strategies for tuneable anisotropy for energy absorption design • Gibson–Ashby scaling validated by experiments and FEA This study introduces two novel triply periodic minimal surface (TPMS) topologies that tessellate within gyrobifastigium (GBF) and elongated gyrobifastigium (EGBF) honeycombs. These represent new minimal surface sheet lattices with such symmetries. Shell structures were generated using the boundary method, fabricated by masked stereolithography, and mechanically tested under quasi-static…