Resumen:

The moiré effect is an interference phenomenon that occurs when two regular geometric arrangements are superimposed, resulting in large-scale fringe patterns that become particularly prominent at acute angles. These arrangements produce waves with noticeable moiré wavelengths, a characteristic extensively harnessed in moiré engineering to achieve tunable wave localization in photonic and acoustic metamaterials. However, the application of such phenomena within the mechanical regime remains comparatively unexplored. To address this gap, a twisted-fence moiré superlattice is proposed as a model to explore the mechanical response. The lattice is investigated using distinct homogenization methods across both linear and nonlinear regimes. Linear micropolar/Cosserat theory is applied to the finite structure to obtain the effective medium stiffness, while Representative Volume Element (RVE) homogenization using finite-strain theory is employed to examine how unit cell geometry governs buckling instabilities under geometric nonlinearity. Comparison studies between finite element simulations and experiments on the TPU twisted-fence lattice under uniaxial compression revealed that increasing the twist angle delays the onset of buckling, enhances structural toughness, and results in higher specific energy absorption (SEA). This highlights the critical role of twist-induced geometry in governing mechanical performance.