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

This study investigates the fatigue behaviour of graded lattice structures. Lattice metamaterials have mostly been studied in the primitive unit-cell structure and designed agnostic of the loading mode. In the torsional loading mode, as against axial loading, the unit cells near the circumference face the highest level of stress. Any failure among the unit cells in this periphery can be detrimental due to reduction in the load-bearing members. In this study, we present a methodology for increasing the torsional strength of additively manufactured Ti-6Al-4V lattice structures based on this fact. We apply field grading to the simple cubic (SC) unit cell to obtain the field-graded simple cubic lattice (FGSC) with superior torsional strength. The new design strategy is compared to the traditional simple cubic unit cell lattice both in the quasi-static and fatigue regimes. When tested under a quasi-static torque, these structures exhibit up to 47% higher average torsional strength for the same relative density. The effect on fatigue strength is even more pronounced obtaining strengthening of up to 169%. It is observed that the architected scaffolds obey the Gibson-Ashby power law, although the scaling constants differ from traditional structures. Considering the tunability and drug-loading ability, these cellular materials are proposed for implantable devices.