Development of nonlinear kinematic hardening modeling concepts for simulation of low-cycle fatigue and creep responses
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Various unified constitutive modeling concepts have been developed at NC State University over the last two decades to simulate a broad set of responses, including low-cycle fatigue, long-term creep, short-term stress relaxation, creep-fatigue, thermomechanical fatigue, and ratcheting responses. Simulation of such a broad set of alloy responses using a nonlinear kinematic hardening constitutive model has been challenging. Improved modeling features have been developed for the Chaboche type unified constitutive model1 (UCM) and coupled with continuum damage models (CDMs), Kachanov, and the isotropic damage, to overcome the challenge of simulating both the low-cycle fatigue and long-term creep responses with a single set of model parameters. Based on the strengths and limitations of the continuum damage models, a modified Isotropic damage model2 is developed. The modified UCM is experimentally validated against a large set of high-temperature alloy responses. The robustness of the modified UCM is demonstrated by simulating the creep responses of a notched specimen. Finally, the response simulation of a thick cylinder under thermal transients is analyzed to show the modified UCM’s applicability in design and evaluation.
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