Creep damage calculation for thermo mechanical fatigue. case study: thermo mechanical loading in bevelled area between two cylindrical shells with different thicknesses

Abstract

The models of thermomechanical fatigue life prediction used for superalloys can be classified into five types: general damage models, damage-rate models, thermomechanical fatigue/strain-range partitioning methods, modified J-integral models, and empirical models. The formulation, which simulates the damage mechanisms and predicts the thermomechanical fatigue lives in various models, has been specified. However, in-depth understanding and theoretical modeling of thermomechanical fatigue damage mechanisms and interactions are still lacking[1]. Based on the evaluated intensity of the stress, it can be concluded which is the preferred variant the design stage, or deduction of the same sizes, in case of technological deviations (cutting errors, so as to result the same inner or outer surface, as in case of the same median surface). Article content refers in this configuration the setting mode related of connection loads that will be taken into account in tensions [5].