Compression performances and damage mechanisms of Al₂O₃ ceramic lattices fabricated by additive manufacturing: Imitating metal crystal structures

It is important for deformation and damage resistance of lightweight engineering to develop novel lattices by additive manufacturing. In this work, we developed five novel lattice structures, tested their compressive properties from x, y, and z directions, and summarized their damage mechanisms from macro to micro view. That the pseudoplastic stress and strain trend of lattices was consistent with the plasticity trend of metal crystal, FCC > BCC > HCP, was a new discovery. Compression behaviors included the short elastic stage, the pseudoplastic stage with fluctuant peaks, and the collapse stage. Tensile and compressive damage models were used to predict lattice damage behaviors, and geometric truss and cantilever beam theories were applied to evaluate the structure stability. Lattice compression performances and damage mechanisms were clarified adequately for the first time. Besides, the geometric structure evolution and defect direction and weakening were the reasons of different compressive strength on three directions. Finally, SFCC lattices had the largest compressive strength, 155.35 MPa, in all lattices with 0.9 mm strut diameter.