ABSTRACT
In this paper a simulation of the defect (material discontinuity) influence on the die forging process has been presented. Two basic operations of the die forging process, i.e. upsetting and preparing, have been simulated. Numerical calculations have been made with the ADINA System using finite element methods. The results show changes in defect geometry as a result of plastic deformation. The defect influence on the plastic strain distribution in the forging and changes in its geometry has also been shown.