This thesis presents the work carried out to build a CAE model and execute an optimization analysis to define the ideal structural frame of two pressurized doors in aluminum alloy. The two doors are expected to be used, the first as an optimized docking hatch for manned modules for terrestrial or lunar orbiting stations, and the second as an EVA door for Moon or Mars future ground bases. The analysis was carried out using sizing or dimensional optimization models and, also as a second option, trying to identify a workable topological optimization. Both option aiming to reduce the mass of the hatches as much as possible.