Within a recent project of German reactor safety research an existing phenomenological material model was improved and verified. The material model allows to simulate numerically the complex procedures during multiaxial and cyclic load in a component. The model makes the simulation for in-phase and out-of-phase loads possible. Parallel to the theoretical work experimental investigations were accomplished. With the experimental data on the one hand the parameter necessary for the material model are determined. On the other hand experiments supply a database from thin-walled hollow cylinders with multiaxial load for the verification of the implementation of the material model to a finite element programme. Good coincidence between measured data and simulation could be achieved in most cases. In some cases the simulation overestimates the measured data. With respect to a safety assessment of components, therefore, the simulation gives conservative results.

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