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Torsion Ball
3D ground structure (lattice) topology optimization
The torsion ball is the optimal structure to transfer a moment provided that the domain is wide enough to allow for the ball (sphere) to develop.
"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.
