Evaluation of component creep behaviour by means of a threshold approach

Creep deformation as well as damage evolution in nut bolt assemblies have b een investigated. A damage model was developed, based on a combination of K achanov theory and critical creep strain threshold. Exceeding the creep str ain threshold cause initiation and growth of creep cavities. The model toge ther with a modified Norton-Bailey creep law was implemented in the user su broutine Creep of the FE code Abacus. Verification of the computation was d one by means of comparison with creep tests of nut bolt assemblies.