Modelling of cyclic behaviour of Haynes 282 at elevated temperatures

Artikel i vetenskaplig tidskrift, 2014

In this paper, the cyclic modelling of Haynes 282 is investigated for a range of elevated temperatures. A calibration of a plastic model including cyclic hardening/softening has been performed and a temperature dependence for the material parameters has been determined. The calibration and validation of the temperature dependence are based on uniaxial low cycle fatigue experiments for four different temperatures. A strategy for the calibration with regard to the temperature dependence is proposed and discussed. The proposed strategy aims at minimising the complexity of the material model without losing any significant accuracy. The calibrated model response is able to capture the experimental results with good accuracy. Furthermore, a finite element example is used to illustrate the influence of the slow cyclic softening when applying many loading cycles to a structure. Owing to the many loading cycles, a technique for cycle extrapolation is incorporated in the finite element analyses and the efficiency and accuracy of this technique are briefly discussed.