3D-printed tensegrity-inspired auxetic metamaterial - experimental and numerical results

This study examines the auxetic behavior of polymeric lattice metamaterials composed of tensegrity-inspired units and fabricated by inverted stereolithography. The geometry of the units is based on the classical expanded octahedron module. The quasi-static response of supercells subjected to compression tests was determined experimentally, while the numerical model of the tests was established by implementing the stress-vs-strain curve of resin samples obtained under identical fabrication and testing conditions. The expected auxetic response of the supercell was observed in the experiments, and it was quantitatively evaluated in the numerical model.

The following files are attached:
- Octahedron supercell.inp - ABAQUS input file for the static FE analysis of the supercell subjected to compression, with the defined stress-vs-strain curve of resin samples;
- RAW_E0[...].csv - RAW files from the universal testing machine for three dog-bone specimens that were used for determining the averaged stress-vs-strain curve for the material model in ABAQUS;
- Processed_E0[...].xlsx - Excel file with the calculations of true strain and true stress values for three dog-bone specimens, and the stress-vs-strain graph implemented in ABAQUS;
- RAW_S[...].csv - RAW files from the universal testing machine for three supercell specimens.