Data for the paper: Mesostructural modification of selected metamaterials manufactured via Laser Powder Bed Fusion from Ti-6Al-4V alloy to improve mechanical properties

This study investigates the mesostructural modification of two metamaterial architectures---Kelvin Cell and Octet Truss---fabricated using LPBF of Ti-6Al-4V titanium alloy. The modifications involved rounding at the unit cell nodes to enhance the metamaterials' effective strength without substantially altering relative density. The paper presents the results of non-linear finite element analysis performed on representative volume elements of the modified structures subjected to uniaxial tensile loading. The simulations utilised material properties of Ti-6Al-4V, typical in manufacturing biomedical implants via LPBF. Each geometry was parametrised across three fillet radii and four relative density levels. The numerical results demonstrated a strong dependence of effective mechanical properties---strength, elastic modulus, and critical strain---on the geometry of the nodal junctions. For the Kelvin Cell structure, these properties improved consistently with increasing fillet radius across the studied range, with negligible impact on relative density. In contrast, for the Octet Truss configuration, optimal rounding enhanced mechanical properties; however, excessive modification reduced effective strength and marked an increase in relative density. Emphasis was placed on critical regions of equivalent and normal stress concentrations and the locations of maximum plastic strain in mesostructures. Two distinct failure mechanisms were analysed concerning the stress and strain distributions.