Mechanical properties of additively manufactured Al2O3 ceramic plate-lattice structures: Experiments & Simulations

Abstract

Ceramic lattice structures (CLSs) have been widely studied and applied because of their excellent properties of ceramics. Among them, the ceramic plate-lattice structures (CPLSs) are new lattice structures, which have better mechanical properties than other CLSs. In this study, we designed and additively manufactured Al2O3 ceramic truncated octahedron (TO) plate-lattice structures with different relative densities to explore their quasi-static and dynamic compressive behaviors in detail. At the same time, to further study the influence of plates on CPLSs, we added two other structural configurations, truncated octahedral plates with plates added only in the loading direction (TOH) and truncated octahedral plates with plates added in all directions (TOA), as a comparative study. It was demonstrated that the relative density (ρ¯) had a significant effect on the quasi-static and dynamic mechanical properties of CPLSs. However, the study of different structures with the same relative density showed that the TOH had the best performance in Young's modulus and compressive strength, followed by TOA and TO. This also confirmed that the plate had a significant effect on CPLSs. Furthermore, the mechanical properties of CPLSs were surprisingly improved under dynamic conditions compared to static conditions, which indicated that CPLSs could effectively cope with extreme environments. In addition, it was revealed by experiment and simulation that the compression destruction and failure of CPLSs, which was helpful to analyze the damage mechanism. These findings would provide valuable guidance for the optimization design and additively manufactured of CPLSs.