Infill topology and shape optimization of lattice‐skin structures

Lattice-skin structures composed of a thin-shell skin and lattice infill are widespread in nature large-scale engineering due to their efficiency exceptional mechanical properties. Recent advances additive manufacturing, or 3D printing, make it possible create lattice-skin almost any size with arbitrary shape geometric complexity. We propose novel gradient-based approach optimising both the improve further. The respective gradients computed by fully considering coupling while topology optimisation problems solved sequential manner. shell is modelled as Kirchhoff-Love analysed using isogeometric subdivision surfaces, whereas pin-jointed truss. consists many cells, possibly different sizes, each containing small number struts. penalisation akin SIMP (solid isotropic material penalisation) method for lattice. Furthermore, corresponding sensitivity filter extraction technique introduced ensure stability process eliminate scattered struts cross-sectional areas. developed suitable non-periodic, non-uniform lattices. For lattice, geometry structure parameterised free-form deformation technique. an iterative, effectiveness proposed influence algorithmic parameters demonstrated several numerical examples.