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.本研究探究了以张拉整体式单元（tensegrity-inspired units）为构型、采用反向立体光刻技术制备的聚合物点阵超材料的拉胀行为。该单元的几何形态基于经典扩展八面体模块。研究通过实验测定了受压缩载荷作用的超胞的准静态响应；同时，采用与试样相同制备与测试条件下获取的树脂试样应力-应变曲线，建立了对应试验的数值模型。实验中观测到超胞预期的拉胀响应，并通过数值模型完成了定量评估。 本次研究附带以下文件： - Octahedron supercell.inp —— 用于超胞压缩静态有限元分析的ABAQUS输入文件，已定义树脂试样的应力-应变曲线； - RAW_E0[...].csv —— 通用试验机采集的3组狗骨形试样（dog-bone specimens）原始数据，用于获取ABAQUS材料模型所需的平均应力-应变曲线； - Processed_E0[...].xlsx —— 包含3组狗骨形试样真实应变、真实应力计算结果，以及ABAQUS中调用的应力-应变曲线图表的Excel文件； - RAW_S[...].csv —— 通用试验机采集的3组超胞试样原始测试数据。