Design of Lattice Structures for Additive Manufacturing

摘要

Design of lattice structures for additive manufacturing The present embodiments relate to additive manufacturing, such as three-dimensional printing. By way of introduction, the present embodiments described below include methods and systems for designing, modeling and manufacturing lattice structures. Lattice cells are modeled as parametrized representative unit cell (RUC) models providing a virtual material characterization for a lattice structure. The parametrized RUC models include phase functions for the virtual material characterization and identification of corresponding normalized material curves fit with polynomial functions for each lattice cell structure. Parametrized lattice models with underlying normalized lattice material curves provide design and simulation of true lattice material behavior for use in topology optimization. The topology optimization utilizes the normalized material curves in a penalization process and by defining lattice zones based on the printability of cells of given densities. The lattice structures are sized for geometrical accuracy and finite-element analysis may be performed with corrected beam diameters.