Replication Data for: Architected LPBF Cellular Metallic Metamaterials with Enhanced Torsional Performance for Bionic Applications

The integration of 3D printing, computational modeling, and biomimicry is poised to revolutionize metamaterial development. Despite this, most lattice-based metamaterials rely on uniform unit cells that fail to account for specific loading directions, such as torsion. Because torsional stress is concentrated at the outer edges, the failure of these perimeter cells can easily compromise the entire structure. To address this, this study introduces a radial field-grading technique designed to enhance the torsional resistance of Ti-6Al-4V lattices manufactured via laser powder bed fusion (LPBF). By redistributing material toward the high-stress outer boundary, researchers developed field-graded simple cubic (FGSC) structures that maintain the same nominal density as uniform simple cubic (SC) structures. Experimental testing showed that FGSC lattices achieved up to a 47% increase in apparent shear strength and up to a 169% improvement in torsional fatigue life. While these architectures obey Gibson-Ashby scaling rules, their scaling constants deviate from idealized models. Finite element modeling confirmed that radial grading decreases average apparent stress amplification and drops the highest 1% of von Mises stress by 18%, identifying the strut intersections (nodes) as the primary points of tensile-constrained fatigue. Because of their adjustable stiffness, permeability, and potential for drug delivery, these graded structures represent a highly viable approach for robust medical implants.