In this thesis, the influence of the porosity on the fatigue life of aluminum parts is analyzed. AlSi7Cu0.5Mg-T6 is used as the studying material in the paper. In the first part, the Murakami and El Haddad model are reviewed. Then, the results of the physical Wöhler test are examined. In the second part of the task, a simulation of fatigue life using local material properties is performed and the Wöhler curve is determined from it. The influence of local material properties is determined and the suitability of the models for determining fatigue life is analyzed.