The computer implemented lightweight design method c mprises the following steps: a preliminary homogenization step (1) for defining a material model related to an adopted manufacturing material; a subsequent optimization step (2) for finding an optimal distribution of material density within the design domain; and a final post-processing step (3) to find the geometry for manufacturing; wherein the preliminary homogenization step (1) is performed for deriving the material model for a 2D/3D version of a porous material provided with circular/spherical holes in a Hexagonal Close-Packed (HCP) arrangement, and the post-processing step (3) comprises computing position and size of the circular/spherical holes (step 32).
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