| Abstract Scope |
In structural engineering, robustness is defined as insensitivity to an initial failure. Thus, when a robust structure is damaged, the initial failure will not cause progressive collapses which can save both costs and lives. In this research, the robustness of various lattice structures was analyzed to identify ideal lattices for damage tolerant structures. For this purpose, a quantitative metric to measure robustness was developed and then applied in this study. Stretching dominated, bending dominated, and augmented bending dominated lattices were evaluated using this previously developed metric. Lattices additively manufactured via metal powder bed fusion were also used, with undamaged and damaged samples subjected to compression testing to validate simulated results. The developed metric shows bending dominated lattices are more robust, likely due to better accommodating new bending moments caused by damage. This research adds another aspect to lattice structure design by showcasing a quantitative method for assessing damage tolerance. |