Abstract <p>Porosity is a problem in many technologies, such as additive manufacturing and the production of polymer, carbon, ceramic, carbon–carbon, and metal–polymer composites. It is a particular concern in the production of multilayer structures by reinforcement or layer-by-layer sintering and fusion. Regardless the technology and the materials employed, cavities of practically similar size, shape, and distribution are obtained, which may significantly affect the physicomechanical properties (elastic modulus, strength, etc.). The influence of the pores’ size, shape, and distribution is most often assessed by numerical modeling using the finite-element method. In the present work, the Digimat and Ansys Workbench software generally used to determine the effective properties of materials is considered.</p>