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Diamond
3D ground structure (lattice) topology optimization
Domain is a cylinder loaded axially at the center of the caps. The domain has a coin-shaped discountinuity in-between the caps.
"GRAND3 — Ground structure based topology optimization for arbitrary 3D domains using MATLAB." T. Zegard and G. H. Paulino. Journal of Structural and Multidisciplinary Optimization 52(6), 2015.