ORALS

SESSION: MultiscaleMonAM-R8	Horstemeyer International Symposium (7th Intl. symp. on Multiscale Material Mechanics & Sustainable Applications)
Mon. 28 Nov. 2022 / Room: Similan 1
Session Chairs: Mike Mikalajunas; Session Monitor: TBA

11:30: [MultiscaleMonAM01] OS Plenary
Integrated Computational Materials Engineering for Geophysics of the Earth
Mark Horstemeyer¹ ; ¹Liberty University, Lynchburg, United States;
Paper Id: 127 [Abstract]

Integrated Computational Materials Engineering (ICME) as reflected by hierarchical multiscale modeling along with modeling the Process-Structure-Property-Performance (PSPP) sequence will be discussed with several applications demonstrating the methodologies. The modeling methodologies will be shown to address a broad range of engineering problems. To predict the performance of a structural component, an analyst needs to consider the microstructure-property relationship to capture material history effects in the constitutive relations when performing the simulations. An effective method to capture the microstructure-property relationship is by use of internal state variable evolution equations, which reflect lower spatial size scale microstructural rearrangements so that history effects can be modeled. This methodology has now been applied to the geophysics of the earth. In engineering practice, once something is made, it is done. However, in the earth, the processing is continuous thus complicating the PSPP sequence. Finally, the past, present, and future will be discussed in the aforementioned context where the future is focused

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

: [MultiscaleAM] OS
A Multiscale Inelastic Internal State Variable Corrosion Model
Mark Horstemeyer¹ ; ¹Liberty University, Lynchburg, United States;
Paper Id: 563 [Abstract]

We present a corrosion Internal State Variable (ISV) damage model based upon the Integrated Computational Materials Engineering (ICME) hierarchical multiscale paradigm. Structure-property experiments for magnesium alloys were used where the only inputs are the volume fractions of each element of the Periodic Table. This macroscale ISV corrosion model finds its basis in Horstemeyer’s mechanical damage model, which includes three separate ISVs for damage nucleation, growth, and coalescence and Walton’s inclusion of corrosion, which introduces five new ISVs for pit nucleation, growth, and coalescence, along with general corrosion and intergranular corrosion. While Walton’s corrosion ISVs were phenomenological in nature, we develop herein a multiscale physical basis for the corrosion ISVs. Parameters for the macroscale corrosion ISVs were garnered from the mesoscale Butler-Volmer equations. Pure magnesium with differing amounts of aluminum were used in corrosion tests to exemplify the different pitting, general corrosion, and intergranular corrosion rates, and the macroscale ISV model was calibrated with said data, in which the only inputs to the model are the volume percent of elements of magnesium and aluminum. Although magnesium alloys were used to motivate and calibrate the model, the model is abstract enough to possibly capture other material systems as well.

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

: [MultiscaleAM] OS
Numerical Framework for Weak Gravity Dynamics
Mark Horstemeyer¹ ; ¹Liberty University, Lynchburg, United States;
Paper Id: 564 [Abstract]

We introduce a computational framework for performing numerical experiments in weak gravity dynamics under the conditions of non-flat inherent geometry of space. It is a generalization of the Particle Mesh method for the case of non-Euclidean geometry. As such, it includes a solver for the Poisson Equation and particle accelerations for the general case of a non-flat three-dimensional space. The framework is useful for performing numerical experiments to investigate the Inherent Structure Hypothesis explanation of the dark matter effect described in earlier work by Tenev and Horstemeyer (2019). It assumes weak gravity and nearly static gravitational fields, which are valid assumptions for our common experience of gravity and are consistent with the conditions under which the Dark Matter effect has been observed. The inputs to the framework are: 1) a displacement function into a transverse fourth dimensions used to specify the inherent curvature of space, 2) a fixed mass density field, and 3) a collection of point particles that only interact through their contribution to the gravitational field. The framework was implemented in MATLAB R and was validated by using it to compute the Sun’s gravitational field and comparing the result to the theoretical prediction.

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

: [MultiscaleAM] OS
A Methodology for Coupling Hopkinson/Kolsky Bar Experiments and Modeling of Tension, Compression, and Torsion at Dynamic Rates
Mark Horstemeyer¹ ; ¹Liberty University, Lynchburg, United States;
Paper Id: 565 [Abstract]

In this paper, we examine multi-axial stress states using a coupled experimental and computational methodology for analyzing high strain rate phenomena of a 6061-T6 aluminum alloy. A variety of experiments and computations were performed to highlight the value of coupling experiments with simulations to gain insight into complex loading conditions. Tensile, torsion/shear, and compression results of a 6061-T6 aluminum alloy were obtained as a base material by a variety of established high strain rate testing methods. Three different Hopkinson/Kolsky pressure bar setups were used: a compression setup to analyze compression, tension, and shear; a tension setup to analyze tension; and a torsion setup to analyze torsion. The resulting methodology allows for experimental corroboration, and the simulations to probe some phenomena that is otherwise impossible to observe during an experiment, while simultaneously testing the validity of the model via direct comparison with measured strain gage histories. While caution must be exercised when using such methods, significant insight during complex loading or loading of complex structures can be acquired, especially those for which the equilibrium conditions necessary for traditional Hopkinson/Kolsky bar testing are impossible to obtain but the dynamic response is still essential.

SESSION: MultiscaleAM-Rpending	Horstemeyer International Symposium (7th Intl. symp. on Multiscale Material Mechanics & Sustainable Applications)
/ Room:
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.

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

: [MultiscaleAM] OS
A Review of the Chemistry-Process-Properties (Magneto-Thermo-Mechanical Properties)-Performance Sequence of Rare-earth Free Magnets (Mn-Based Magnetic Alloys)
Mark Horstemeyer¹ ; ¹Liberty University, Lynchburg, United States;
Paper Id: 567 [Abstract]

We present a magneto-thermo-mechanical literature review of Rare-Earth free magnets, focusing on Mn-based binary alloys in relation to their Chemistry-Process-Structure-Property- Performance (CPSPP) relationships. Recent electric performance systems and technologies use Rare-Earth (RE) magnets due to the high magnetic power they provide; however, the limited resources of RE elements in the earth, has pushed the emerging need to identify and understand Mn-based magnetic alloys. Mn is abundant, fairly inexpensive, easily manufacturable, and eco- friendly. Although previous literature reviews included magnetic properties of different RE based and RE free magnets, none of the previous literature reviews related the magnetic properties to the mechanical properties nor did they relate the complete CPSPP relationship. Magnetic and mechanical properties interdependently affect each other with more complexity added under different temperature materials processing and performance environments. The thermomechanical deformation processes impact the multiscale hierarchical structures and the associated magnetic behavior at different size scales (electrons, subgrains, grains, and polycrystals). The magneto- thermo-mechanical properties of Mn-based alloys with a focus on MnAl, MnBi, and MnZn binary alloys and an associated CPSPP map are presented.