Multicomponent topology optimization of functionally graded lattice structures with bulk solid interfaces

This article presents a topology optimization method for structures consisting of multiple lattice components under certain size, which can be manufactured with an additive manufacturing machine size limit and assembled via conventional joining processes, such as welding, gluing, riveting, bolting. The proposed simultaneously optimize overall structural topology, partitioning to functionally graded lattices within each component. infill guaranteed connectivity is realized by applying the Helmholtz PDE filter variable radius on density field in solid isotropic material penalization (SIMP) method. structure into discrete (DMO) method, interpreted component, component imposed chosen machine. A gradient-free coating realizes bulk boundaries provide continuous mating surfaces between adjacent enable subsequent joining. interfaces are extracted assigned distinct property, model joints components. Several numeral examples solved demonstration.