Numerical evaluation of ratcheting effects on the deformation and failure behaviour of components

Within the frame of a project of the reactor safety research the refinement of an existing phenomenological material model accomplished a numerical tool that allows the simulation of complex processes with multiaxial loads in a specific component. The model allows the simulation of loads with an in-phase or phase-shifted temporal behaviour. Parallel to the theoretical studies experimental investigations were performed that provided the required parameters for the material model. The experiments using thin-walled hollow cylinders with multiaxial loading provided a data base for the verification of the implemented materials model in the finite element program. There was a good agreement between simulation and experiment. In few cases the simulation overestimated the measurement and thus provides safety relevant evaluations with a certain safety margin