THERMOMECHANICAL FATIGUE RESPONSE AND CONSTITUTIVE MODELING FOR HAYNES 230

Design by analysis is usually performed by commercially available finite element analysis (FEA) software. Constitutive models available.in the FEA software are developed and validated using limited experimental data. Hence, a broad set of thermomechanical fatigue experiments with strain dwell at compressive peaks are performed to understand local fatigue failure responses of high temperature components. This study developed a unified viscoplastic model based on nonlinear kinematic hardening of Chaboche type with added features of strain range dependence, rate dependence, temperature dependence, static recovery, and mean stress evolution. The robustness of the constitutive model is demonstrated by comparing its simulations against the experimental responses.