ORALS

SESSION: MultiscaleAM-Rpending	Horstemeyer International Symposium (7th Intl. symp. on Multiscale Material Mechanics & Sustainable Applications)
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Session Chairs: TBA Session Monitor: TBA

: [MultiscaleAM] OS
Modeling Damage, Recrystallization, and Texture Using an Internal State Variable Framework with Application to Mantle Dynamics Processes
Douglas Bammann¹ ; John Baumgardner² ; Mark Horstemeyer² ; ¹Mississippi State University, Mississippis State, United States; ²Liberty University, Lynchburg, United States;
Paper Id: 566 [Abstract]

We add damage, recrystallization, and texture treatments to the Bammann inelasticity internal state variable (BIISV) model framework to significantly improve the representation of the deformation-related processes in the earth’s mantle. We implement these additional features into the existing BIISV model in TERRA2D and show that all three physical mechanisms exert considerable influence on the flow history in simple 2D internally heated convection test cases. Using the enhanced BIISV framework we perform a limited parametric study to explore the model’s effects on stability of the cold upper thermal boundary layer. As expected the damage and recrystallization treatments enhance the cold upper thermal boundary layer’s tendency to weaken and plunge into the hotter region below. The texture treatment increases the intensity of rotational flow within the hotter zone as cold boundary material plunges downward which in turn aids in destabilizing the cold upper thermal boundary layer. Having all these treatments in a single integrated rheological framework that tracks internal history variables in a common manner represents a significant advance in handling deformational physics for mantle phenomena in a comprehensive, unified, and automatic manner.