Today, the powder metallurgy process is widely applied in various industries. It provides the production of new materials with specific and improved properties. One of the frequently used materials obtained by the powder metallurgy process is sintered steel. In this thesis, based on the data obtained experimentally during the execution of the monotonic tensile test at a loading speed of 1 mm/min, the modeling of the constitutive behavior of the material and the determination of the fracture parameters were carried out. For the material parameters defined in this way, a numerical analysis was performed first in Abaqus/Standard and then in Abaqus/Explicit at various loading rates. In the first chapter, the process of obtaining sintered steel is described and the properties of sintered steel Astaloy Mo+0,2C are given. In the second chapter, the finite element method is described, explicit methods of time integration are explained and the finite elements used are described. In the third chapter, the elastoplastic behavior and hardening of the material is described. Also, material models used in numerical calculations are explained. The fourth chapter describes the numerical modeling of damage initiation and growth. In the fifth chapter, a numerical simulation of the tensile test was performed on test tubes made of sintered steel of three different densities: 6.5 g/cm3, 6.8 g/cm3 and 7.1 g/cm3, and the results of the influence of different loading rates on the fracture behavior of sintered steel were given. The loading speeds used are: 1 mm/min, 2 mm/min, 5 mm/min and 10 mm/min. The conclusion of the entire work is given in the sixth chapter.