Synchrotron X-ray micro-computed tomography imaging of 3D re-entrant micro lattice during in situ micro compression experimental process

3D re-entrant mechanical metamaterials were designed and fabricated with PμLSE (Projection Micro Litho Stereo Exposure) 3D printing technique, synchrotron X-Ray tomography 3D imaging and in situ mechanical experiments were performed for characterizing additive manufacturing (AM) process induced internal defects, corresponding relations between defects and mechanical behaviors of harvested 3D re-entrant lattice samples were explored through experiments and simulations comparisons. Firstly, in situ micro compression mechanical test device was designed and constructed for in situ synchrotron X-Ray 3D tomography mechanical experiments; Afterwards, interrupted in situ compression tests were performed for investigating the effects of manufacturing process induced defects on the deformation behaviors of 3D re-entrant lattice metamaterials, and finite element (FE) modeling was performed and compared with experimental results for understanding the mechanical behaviors of as-fabricated 3D re-entrant lattice metamaterials. © 2020 The Authors