Unified Constitutive Modeling of Haynes 230 for Thermomechanical Fatigue-Creep and Creep Behavior

Abstract Research on the macroscopic phenomenological constitutive model of Haynes 230, which is frequently used as an aero engine combustor liner material, still has important engineering significance. Based on a proposed model for isothermal fatigue and fatigue-creep, a constitutive model is developed which can simulate the thermomechanical fatigue-creep and pure creep behaviors. The results of simulation and experiment are in good agreement with each other under thermomechanical fatigue-creep loads for the hysteresis loops at half-life, the stress amplitude and the mean stress evolution, or the stress relaxation during dwell time. Good results are also obtained in the case of pure creep. Meanwhile, the simulation of isothermal fatigue and fatigue-creep also maintains high accuracy. The main contribution of this paper is to propose a robust unified constitutive model that has the adaptability to a wide range of temperature variations and is suitable for various types of fatigue-creep interaction loads.