Deformation mechanisms and mechanical performances of architected mechanical metamaterials with gyroid topologies: Synchrotron X-ray radiation in-situ compression experiments and 3D image based finite element analysis

Synchrotron radiation X-ray micro-computed tomography (SR-μCT) is a robust non-destructive 3D imaging technique that has been widely used to characterize defects in advanced materials and structures, which demonstrates great advantages for defects characterizations and microstructures evolution process investigations of mechanical metamaterials at micro- and nano-scales. In this study, the internal features and damage evolution of the periodic architected mechanical metamaterials manufactured with projection micro litho stereo exposure (PμLSE) are investigated by combining SR-μCT 3D imaging techniques and in-situ compression experiments. The results show that the failure process of periodic architected mechanical metamaterials under compression loading is characterized by the curved surface fracture and curved surface buckling through the damage evolution process. Afterwards, reconstructed geometrical model based on SR-μCT 3D tomography images is proposed to analyze the relationship between the manufactured sample and the mechanical behavior, and the in-situ experiments and numerical simulation results were compared for verification.