Dissertation/Thesis Abstract

A phenomenological model for dynamic recrystallization
by Simmons, Jason Mark, M.S., Mississippi State University, 2011, 132; 1491087
Abstract (Summary)

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

Indexing (document details)
Advisor: Horstemeyer, Mark F., Solanki, Kiran N.
Commitee: Bammann, Douglass J., Castanier, Matthew P.
School: Mississippi State University
Department: Mechanical Engineering
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
Publication Number: 1491087
ISBN: 9781124589220
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