Experiments and Modelling of the Cyclic Behaviour of Haynes 282

In this contribution the mechanical behaviour of the Ni-based superalloy Haynes 282, developed for high-temperature applications in aero and land based gas turbine engines, is studied. Experiments for cyclic loading have been performed at room temperature and elevated temperature. To capture the cyclic hardening/softening of the material at the different temperatures, a plasticity model has been calibrated against experimental data. The robustness and the uniqueness of the identified material parameters are ensured by performing sensitivity and correlation analyses. A criterion based on the strain energy density, is used for LCF life predictions of Haynes 282. The criterion has been tuned to fit test data for the different temperatures and it has been evaluated with respect to both cyclic experimental data and with respect to model response. The influence of uncertainties in experimental data on identified material parameters, fatigue life predictions and finite element predictions has been investigated.

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