[en] Within the scope of the project the applicability of local approach models to different steels in reactor technology was investigated. To this two ferritic and one austenitic material were investigated. The metallographic investigations carried out in this project prove the fact that the fracture development of the three investigated materials can be divided in three phases: Void initiation, void growth, and void coalescence. The focus of the research project was to determine the parameters required for the local approach models if possible with the help of metallographic investigations. In order to obtain quantitative results with realistic expenditure an automatic imagine evaluation system was adapted. In the course of the project it could be found that two out of the maximum six damage parameters of the Rousselier model were constant for all three materials. There is an indication that these two parameters are independent of the material and can generally be assumed as constant. The investigations have proved that the selected local approach models are adequate for calculating the failure behaviour of smooth, notched and precracked specimens under static load. The parameters required for the damage models are independent of geometry and size, and so a transferability of the parameters is possible. (orig./MM)