Achieving near yield isotropy with an offset-node hybrid lattice design

Lattice materials offer highly customizable mechanical properties, but their practical application is often limited by pronounced anisotropy, which makes them unsuitable for non-deterministic, multi-axial loading environments. While significant progress has been made in achieving elastic isotropy, controlling yield anisotropy, critical for nonlinear large deformations, remains a challenge. To address this, we introduce a novel design strategy that offsets the central node of a cubic unit cell along its spatial diagonal, creating a tunable hybrid architecture that interpolates between Simple Cubic and Body-Centered Cubic configurations. We systematically map the design space defined by this offset ratio and relative density to tailor elastic isotropic properties. Crucially, numerical and experimental results reveal that this ratio also provides precise control over yield anisotropy. We demonstrate a high degree of yield isotropy, achieving a near-ideal anisotropy ratio of 1.05 at a relative density of 0.25. This performance represents a notable advancement in the development of isotropic lattice architectures within the nonlinear regime. This exceptional isotropy remains stable across increasing densities, confirming the design’s robustness. Combined with high inherent stiffness and strength, these near-isotropic lattices are prime candidates for advanced load-bearing applications under uncertain loading conditions. Our strategy provides a powerful method for controlling anisotropy across linear and nonlinear regimes, with promising applications in aerospace, biomedical engineering, and beyond.