The present study develops a phenomenological adaptation to an internal state variable (ISV) model that incorporates the influence of dynamic recrystallization (DRX) in a material’s evolving microstructure and flow stress response. During metal forming and joining processes that promote internal heat distributions and large strains, microstructural processes often occur that result in a transformation of the evolving microstructure away from the base distribution. In an effort to lower the stored energy accumulated in the material’s lattice and grain structure, the deformed material may undergo a type of dynamic recovery process, such as DRX.
In this study, the ISV model’s flow stress output is modified to include a phenomenological DRX softening and hardening term internal to the isotropic hardening rate ISV. The flow stress thus directly includes the influence of microstructure evolution. The evolving grain size is modeled such that an inverse relation exists between strain hardening and average grain size.
Key words: recrystallization, microstructure, constitutive model, grain size, strain rate, temperature, stress, hardening
|Advisor:||Horstemeyer, Mark F., Solanki, Kiran N.|
|Commitee:||Bammann, Douglass J., Castanier, Matthew P.|
|School:||Mississippi State University|
|School Location:||United States -- Mississippi|
|Source:||MAI 49/05M, Masters Abstracts International|
|Subjects:||Mechanical engineering, Materials science|
|Keywords:||Constitutive model, Grain size, Microstructure, Strain rate, Stress, Temperature|
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