Abstract
The Body-Centered Tetragonal (BCT) lattice structure is an anisotropic lattice with excellent lightweight properties, superior mechanical performance, structural simplicity, and good space-filling capability, leading to its widespread application across various fields.In this study, BCT lattice structures were fabricated using selective laser melting (SLM) technology. The relationships between structural parameters (strut angle and strut length) and failure modes were investigated through theoretical analysis, experiments, and simulations, while establishing the connection between failure modes and mechanical properties. The results indicate that both elastic modulus and yield strength are positively correlated with strut angle and negatively correlated with strut length. As the strut angle increases and strut length decreases, the elastic modulus rises from 0.054 to 1.62 GPa, and the yield strength increases from 1.97 to 39.10 MPa. The failure mode significantly influences performance, with strut buckling failure yielding superior mechanical properties compared to node failure.

Key words
selective laser melting, Body-Centered Tetragonal (BCT) lattice structure, finite element analysis, mechanical properties, failure analysis

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