부산대학교 도서관

Summary: A constitutive model was developed in an integrated manner and the features of the model were driven by experimental evidence. The constitutive model was validated against the broad set of isothermal fatigue & creep-fatigue, and thermo-mechanical creep-fatigue responses. The developed Chaboche-based constitutive model includes features of rate-dependence, static recovery, kinematic hardening evolution, strain range dependence, mean stress evolution and novel features of maximum temperature influence. Implementations of the constitutive model, both as a stand-alone code and as a custom material model in commercial finite element analysis software, are developed and discussed in detail. The derivation of the consistent tangent modulus is presented for implementation of the constitutive model as a custom model in any commercial finite element software. Overall, the proposed constitutive model is adequately able to simulate the isothermal fatigue & creep-fatigue responses, as well as the thermo-mechanical creep-fatigue out-of-phase and in-phase hysteresis loops, stress amplitude & mean stress, and stress relaxation responses.