With the development of Additive Manufacturing, it has become possible to create components with complex geometries, such as lattice or reticular structures. Thanks to their high specific energy absorption combined with low mass, these structures have proven to be very interesting in terms of mechanical properties. The aim of this thesis is to create a numerical model that allows estimating the mechanical behavior of 3D printed components with lattice structures using a multiscale approach. Micro Computer Technology analyses performed on AlSi10Mg lattice specimens revealed the presence of internal porosity within the lattice structure. To account for these internal defects, a multiscale approach was adopted, allowing for faster and more precise simulations at the microscopic level with three-dimensional elements incorporating defects, using Abaqus CAE for Finite Element Analysis.