+publisher:"Mississippi State University" +contributor:("Mark F. Horstemeyer")

Mississippi State University

1. Nacife el Alaoui , Reda. Internal state variable plasticity-damage modeling of AISI 4140 steel including microstructure-property relations: temperature and strain rate effects.

Degree: MS, Aerospace Engineering, 2016, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-07192016-201742/ ;

► Mechanical structure-property relations have been quantified for AISI 4140 steel under different strain rates and temperatures. The structure-property relations were used to calibrate a… (more)

Subjects/Keywords: Finite Element Analysis (FEA) modeling; damage.; Internal State Variable (ISV); 4140 steel

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APA (6^th Edition):

Nacife el Alaoui , R. (2016). Internal state variable plasticity-damage modeling of AISI 4140 steel including microstructure-property relations: temperature and strain rate effects. (Masters Thesis). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-07192016-201742/ ;

Chicago Manual of Style (16^th Edition):

Nacife el Alaoui , Reda. “Internal state variable plasticity-damage modeling of AISI 4140 steel including microstructure-property relations: temperature and strain rate effects.” 2016. Masters Thesis, Mississippi State University. Accessed October 25, 2020. http://sun.library.msstate.edu/ETD-db/theses/available/etd-07192016-201742/ ;.

MLA Handbook (7^th Edition):

Nacife el Alaoui , Reda. “Internal state variable plasticity-damage modeling of AISI 4140 steel including microstructure-property relations: temperature and strain rate effects.” 2016. Web. 25 Oct 2020.

Vancouver:

Nacife el Alaoui R. Internal state variable plasticity-damage modeling of AISI 4140 steel including microstructure-property relations: temperature and strain rate effects. [Internet] [Masters thesis]. Mississippi State University; 2016. [cited 2020 Oct 25]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-07192016-201742/ ;.

Council of Science Editors:

Nacife el Alaoui R. Internal state variable plasticity-damage modeling of AISI 4140 steel including microstructure-property relations: temperature and strain rate effects. [Masters Thesis]. Mississippi State University; 2016. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-07192016-201742/ ;

Mississippi State University

2. Lee, Na Yeon. Experimental-computational analysis of woodpeckers beaks/hyoid apparatus for damping of stress waves.

Degree: PhD, Agricultural and Biological Engineering, 2016, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-04082016-132442/ ;

► This dissertation proposes engineering principles for stress wave dissipation found in woodpeckers. From the experimental study of a woodpeckers beaks via electron microscopy and… (more)

▼ This dissertation proposes engineering principles for stress wave dissipation found in woodpeckers. From the experimental study of a woodpeckers beaks via electron microscopy and mechanical testing, the three main design factors were pointed out. First, a woodpeckers beak has wavy lines inside of the beak for local shearing. The waviness of wavy lines found in the woodpeckers beaks was 1 while chickens was 0.3, and toucans was 0.05. Second, the woodpecker showed elongated the keratin scales to the pecking direction with a dimension ratio of 3.67 (width/height) while chickens and toucans were 3 and 1, respectively. Third, a woodpeckers beak bone was less porous for structural strength. The porosity of a woodpeckers beak bone was about 9.9 % while chickens and toucans were 42.3 % and 61.5 %, respectively. Also, by using computational simulations, unique geometries including hyoid apparatus and suture interfaces found in woodpeckers were investigated to assess their damping capabilities. Surrounding a woodpeckers head, the hyoid apparatus composed of core cartilage and muscle encasing a core cartilage. The spiral and thinning geometry of the hyoid apparatus converted the normal waves into shear waves. Then shear waves generated lateral displacement of the hyoid bone, and lateral displacement brought strain energy into surrounding muscle, in which energy loss occurred by viscoelastic behavior of the muscle. Quantitatively, as the stress wave traveled from the anterior to the posterior end of the hyoid apparatus, its pressure decreased 75 % and the impulse decreased 84 %. Suture interfaces, which is another unique feature observed from woodpeckers beak, was investigated for their geometrical effects on the dynamic impact mitigation. A sinusoidal pattern of suture interfaces induced wave scattering at its boundary causing conversion of longitudinal waves into shear waves. The suture gap also brought pressure decay by storing strain energy in its viscoelastic material. As a result, a bar with a suture interface attenuated stress waves about 37 % more than a bar with a flat interface. Based on the results and ideas presented herein, one can develop bio-inspired material for energy absorbing. Advisors/Committee Members: Lakiesha N. Williams (chair), Mark F. Horstemeyer (chair).

Subjects/Keywords: woodpecker; stress wave; damping; dissipation; biological material

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APA (6^th Edition):

Lee, N. Y. (2016). Experimental-computational analysis of woodpeckers beaks/hyoid apparatus for damping of stress waves. (Doctoral Dissertation). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-04082016-132442/ ;

Chicago Manual of Style (16^th Edition):

Lee, Na Yeon. “Experimental-computational analysis of woodpeckers beaks/hyoid apparatus for damping of stress waves.” 2016. Doctoral Dissertation, Mississippi State University. Accessed October 25, 2020. http://sun.library.msstate.edu/ETD-db/theses/available/etd-04082016-132442/ ;.

MLA Handbook (7^th Edition):

Lee, Na Yeon. “Experimental-computational analysis of woodpeckers beaks/hyoid apparatus for damping of stress waves.” 2016. Web. 25 Oct 2020.

Vancouver:

Lee NY. Experimental-computational analysis of woodpeckers beaks/hyoid apparatus for damping of stress waves. [Internet] [Doctoral dissertation]. Mississippi State University; 2016. [cited 2020 Oct 25]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-04082016-132442/ ;.

Council of Science Editors:

Lee NY. Experimental-computational analysis of woodpeckers beaks/hyoid apparatus for damping of stress waves. [Doctoral Dissertation]. Mississippi State University; 2016. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-04082016-132442/ ;

Mississippi State University

3. Holmer, Matthew S. Structural analysis and design of seals for coal mine safety.

Degree: MS, Mechanical Engineering, 2016, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-03112016-181730/ ;

► This research shows that worst-case methane-air detonation loading on coal mine seals could be more severe than the design loads required by federal regulations,… (more)

Subjects/Keywords: reinforced concrete; protective structures; mine safety; MSHA; mine seals; explosion; sealing; methane; coal mine

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APA (6^th Edition):

Holmer, M. S. (2016). Structural analysis and design of seals for coal mine safety. (Masters Thesis). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-03112016-181730/ ;

Chicago Manual of Style (16^th Edition):

Holmer, Matthew S. “Structural analysis and design of seals for coal mine safety.” 2016. Masters Thesis, Mississippi State University. Accessed October 25, 2020. http://sun.library.msstate.edu/ETD-db/theses/available/etd-03112016-181730/ ;.

MLA Handbook (7^th Edition):

Holmer, Matthew S. “Structural analysis and design of seals for coal mine safety.” 2016. Web. 25 Oct 2020.

Vancouver:

Holmer MS. Structural analysis and design of seals for coal mine safety. [Internet] [Masters thesis]. Mississippi State University; 2016. [cited 2020 Oct 25]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-03112016-181730/ ;.

Council of Science Editors:

Holmer MS. Structural analysis and design of seals for coal mine safety. [Masters Thesis]. Mississippi State University; 2016. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-03112016-181730/ ;

Mississippi State University

4. Burcham, Megan Noel. Multiscale structure-property relationships of ultra-high performance concrete.

Degree: MS, Mechanical Engineering, 2016, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-06232016-161231/ ;

► The structure-property relationships of Ultra-High Performance Concrete (UHPC) were quantified using imaging techniques to characterize the multiscale hierarchical heterogeneities and the mechanical properties. Through… (more)

Subjects/Keywords: ultra-high performance concrete; mesoscale

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APA (6^th Edition):

Burcham, M. N. (2016). Multiscale structure-property relationships of ultra-high performance concrete. (Masters Thesis). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-06232016-161231/ ;

Chicago Manual of Style (16^th Edition):

Burcham, Megan Noel. “Multiscale structure-property relationships of ultra-high performance concrete.” 2016. Masters Thesis, Mississippi State University. Accessed October 25, 2020. http://sun.library.msstate.edu/ETD-db/theses/available/etd-06232016-161231/ ;.

MLA Handbook (7^th Edition):

Burcham, Megan Noel. “Multiscale structure-property relationships of ultra-high performance concrete.” 2016. Web. 25 Oct 2020.

Vancouver:

Burcham MN. Multiscale structure-property relationships of ultra-high performance concrete. [Internet] [Masters thesis]. Mississippi State University; 2016. [cited 2020 Oct 25]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-06232016-161231/ ;.

Council of Science Editors:

Burcham MN. Multiscale structure-property relationships of ultra-high performance concrete. [Masters Thesis]. Mississippi State University; 2016. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-06232016-161231/ ;

Mississippi State University

5. Shrestha, Rakish. Fatigue behavior and modeling of polyether ether ketone (PEEK) under constant and variable amplitude loadings.

Degree: MS, Mechanical Engineering, 2016, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10232016-114811/ ;

► The fatigue behavior and cyclic deformation of polyether ether ketone (PEEK) subjected to various uniaxial cyclic loading conditions were experimentally investigated. These include constant… (more)

Subjects/Keywords: PEEK; Fatigue

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APA (6^th Edition):

Shrestha, R. (2016). Fatigue behavior and modeling of polyether ether ketone (PEEK) under constant and variable amplitude loadings. (Masters Thesis). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-10232016-114811/ ;

Chicago Manual of Style (16^th Edition):

Shrestha, Rakish. “Fatigue behavior and modeling of polyether ether ketone (PEEK) under constant and variable amplitude loadings.” 2016. Masters Thesis, Mississippi State University. Accessed October 25, 2020. http://sun.library.msstate.edu/ETD-db/theses/available/etd-10232016-114811/ ;.

MLA Handbook (7^th Edition):

Shrestha, Rakish. “Fatigue behavior and modeling of polyether ether ketone (PEEK) under constant and variable amplitude loadings.” 2016. Web. 25 Oct 2020.

Vancouver:

Shrestha R. Fatigue behavior and modeling of polyether ether ketone (PEEK) under constant and variable amplitude loadings. [Internet] [Masters thesis]. Mississippi State University; 2016. [cited 2020 Oct 25]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10232016-114811/ ;.

Council of Science Editors:

Shrestha R. Fatigue behavior and modeling of polyether ether ketone (PEEK) under constant and variable amplitude loadings. [Masters Thesis]. Mississippi State University; 2016. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10232016-114811/ ;

Mississippi State University

6. Parrish, Andrew E. CRASHWORTHINESS OPTIMIZATION OF VEHICLE STRUCTURES CONSIDERING THE EFFECTS OF LIGHTWEIGHT MATERIAL SUBSTITUTION AND DUMMY MODELS.

Degree: MS, Aerospace Engineering, 2011, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-07072011-131745/ ;

► This study uses numerical design optimization with advanced metamodeling techniques to investigate the effects of material substitution and dummy models on crashworthiness characteristics of… (more)

Subjects/Keywords: Crashworthiness; Design Optimization; Metamodel; Automotive Structures; Material Substitution

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APA (6^th Edition):

Parrish, A. E. (2011). CRASHWORTHINESS OPTIMIZATION OF VEHICLE STRUCTURES CONSIDERING THE EFFECTS OF LIGHTWEIGHT MATERIAL SUBSTITUTION AND DUMMY MODELS. (Masters Thesis). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-07072011-131745/ ;

Chicago Manual of Style (16^th Edition):

Parrish, Andrew E. “CRASHWORTHINESS OPTIMIZATION OF VEHICLE STRUCTURES CONSIDERING THE EFFECTS OF LIGHTWEIGHT MATERIAL SUBSTITUTION AND DUMMY MODELS.” 2011. Masters Thesis, Mississippi State University. Accessed October 25, 2020. http://sun.library.msstate.edu/ETD-db/theses/available/etd-07072011-131745/ ;.

MLA Handbook (7^th Edition):

Parrish, Andrew E. “CRASHWORTHINESS OPTIMIZATION OF VEHICLE STRUCTURES CONSIDERING THE EFFECTS OF LIGHTWEIGHT MATERIAL SUBSTITUTION AND DUMMY MODELS.” 2011. Web. 25 Oct 2020.

Vancouver:

Parrish AE. CRASHWORTHINESS OPTIMIZATION OF VEHICLE STRUCTURES CONSIDERING THE EFFECTS OF LIGHTWEIGHT MATERIAL SUBSTITUTION AND DUMMY MODELS. [Internet] [Masters thesis]. Mississippi State University; 2011. [cited 2020 Oct 25]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-07072011-131745/ ;.

Council of Science Editors:

Parrish AE. CRASHWORTHINESS OPTIMIZATION OF VEHICLE STRUCTURES CONSIDERING THE EFFECTS OF LIGHTWEIGHT MATERIAL SUBSTITUTION AND DUMMY MODELS. [Masters Thesis]. Mississippi State University; 2011. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-07072011-131745/ ;

Mississippi State University

7. Whittington, Wilburn Ray. Development of intermediate and high strain rate experimentation and material modeling for viscoplastic metals.

Degree: PhD, Mechanical Engineering, 2015, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10262015-110522/ ;

► This work presents a combined theoretical-experimental study of strain rate behavior in metals. The method is to experimentally calibrate and validate an Internal State… (more)

Subjects/Keywords: intermediate strain rate; high strain rate; internal state variables; metals

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APA (6^th Edition):

Whittington, W. R. (2015). Development of intermediate and high strain rate experimentation and material modeling for viscoplastic metals. (Doctoral Dissertation). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-10262015-110522/ ;

Chicago Manual of Style (16^th Edition):

Whittington, Wilburn Ray. “Development of intermediate and high strain rate experimentation and material modeling for viscoplastic metals.” 2015. Doctoral Dissertation, Mississippi State University. Accessed October 25, 2020. http://sun.library.msstate.edu/ETD-db/theses/available/etd-10262015-110522/ ;.

MLA Handbook (7^th Edition):

Whittington, Wilburn Ray. “Development of intermediate and high strain rate experimentation and material modeling for viscoplastic metals.” 2015. Web. 25 Oct 2020.

Vancouver:

Whittington WR. Development of intermediate and high strain rate experimentation and material modeling for viscoplastic metals. [Internet] [Doctoral dissertation]. Mississippi State University; 2015. [cited 2020 Oct 25]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10262015-110522/ ;.

Council of Science Editors:

Whittington WR. Development of intermediate and high strain rate experimentation and material modeling for viscoplastic metals. [Doctoral Dissertation]. Mississippi State University; 2015. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10262015-110522/ ;

Mississippi State University

8. Johnson, Kyle Leslie. From horns to helmets: multi-objective design optimization considerations to protect the brain.

Degree: PhD, Mechanical Engineering, 2016, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-04222016-123800/ ;

► This dissertation presents an investigation and design optimization of energy absorbent protective systems that protect the brain. Specifically, the energy absorption characteristics of the… (more)

▼ This dissertation presents an investigation and design optimization of energy absorbent protective systems that protect the brain. Specifically, the energy absorption characteristics of the bighorn sheep skull-horn system were quantified and used to inform a topology optimization performed on a football helmet facemask leading to reduced values of brain injury indicators. The horn keratin of a bighorn sheep was experimentally characterized in different stress states, strain rates, and moisture contents. Horn keratin demonstrated a clear strain rate dependence in both tension and compression. As the strain rate increased, the flow stress increased. Also, increased moisture content decreased the strength and increased ductility. The hydrated horn keratin energy absorption increased at high strain rates when compared to quasi-static data. The keratin experimental data was then used to inform constitutive models employed in the simulation of bighorn sheep head impacts at 5.5 m/s. Accelerations values as high as 607 Gs were observed in finite element simulations for rams butting their heads, which is an order of magnitude higher than predicted brain injury threshold values. In the most extreme case, maximum tensile pressure and maximum shear strains in the ram brain were 245 kPa and 0.28, respectively. These values could serve as true injury metrics for human head impacts. Finally, a helmeted human head Finite Element (FE) model is created, validated, and used to recreate impacts from a linear impactor. The results from these simulations are used to train a surrogate model, which is in turn utilized in multi-objective design optimization. Brain injury indicators were significantly reduced by performing multi-objective design optimization on a football helmet facemask. In particular, the tensile pressure and maximum shear strain in the brain decreased 7.5 % and 39.5 %, respectively when comparing the optimal designs to the baseline design. While the maximum tensile pressure and maximum shear strain values in the brain for helmeted head impacts (30.2 kPa and 0.011) were far less than the ram impacts (245 kPa and 0.28), helmet impacts up to 12.3 m/s have been recorded, and could easily surpass these thresholds. Advisors/Committee Members: Mark F. Horstemeyer (chair), Rajkumar Prabhu (committee member), Lakiesha N. Williams (committee member), Youssef Hammi (committee member).

Subjects/Keywords: structure-property relationship; metamodeling; surrogate modeling; football helmet; traumatic brain injury; concussion; multi-objective design optimization; shock wave; keratin; mechanical properties; bighorn sheep; ram horn

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APA (6^th Edition):

Johnson, K. L. (2016). From horns to helmets: multi-objective design optimization considerations to protect the brain. (Doctoral Dissertation). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-04222016-123800/ ;

Chicago Manual of Style (16^th Edition):

Johnson, Kyle Leslie. “From horns to helmets: multi-objective design optimization considerations to protect the brain.” 2016. Doctoral Dissertation, Mississippi State University. Accessed October 25, 2020. http://sun.library.msstate.edu/ETD-db/theses/available/etd-04222016-123800/ ;.

MLA Handbook (7^th Edition):

Johnson, Kyle Leslie. “From horns to helmets: multi-objective design optimization considerations to protect the brain.” 2016. Web. 25 Oct 2020.

Vancouver:

Johnson KL. From horns to helmets: multi-objective design optimization considerations to protect the brain. [Internet] [Doctoral dissertation]. Mississippi State University; 2016. [cited 2020 Oct 25]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-04222016-123800/ ;.

Council of Science Editors:

Johnson KL. From horns to helmets: multi-objective design optimization considerations to protect the brain. [Doctoral Dissertation]. Mississippi State University; 2016. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-04222016-123800/ ;

Mississippi State University

9. Lawrimore, William Brantley. Multiscale modeling of multiphase polymers.

Degree: PhD, Mechanical Engineering, 2016, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-04222016-122150/ ;

► Accurately simulating material systems in a virtual environment requires the synthesis and utilization of all relevant information regarding performance mechanisms for the material occurring… (more)

▼ Accurately simulating material systems in a virtual environment requires the synthesis and utilization of all relevant information regarding performance mechanisms for the material occurring over a range of length and time scales. Multiscale modeling is the basis for the Integrated Computational Materials Engineering (ICME) Paradigm and is a powerful tool for accurate material simulations. However, while ICME has experienced adoption among those in the metals community, it has not gained traction in polymer research. This thesis seeks establish a hierarchical multiscale modeling methodology for simulating polymers containing secondary phases. The investigation laid out in the chapters below uses mesoscopic Finite Element Analysis (FEA) as a foundation to build a multiscale modeling methodology for polymer material systems. At the mesoscale a Design of Experiments (DOE) parametric study utilizing FEA of polymers containing defects compared the relative impacts of a selection of parameters on damage growth and coalescence in polymers. Of the parameters considered, the applied stress state proved to be the most crucial parameter affecting damage growth and coalescence. At the macroscale, the significant influence of the applied stress state on damage growth and coalescence in polymers (upscaled from the mesoscale) motivated an expansion of the Bouvard Internal State Variable (ISV) (Bouvard et al. 2013) polymer model stress state sensitivity. Deviatoric stress invariants were utilized to modify the Bouvard ISV model to account for asymmetry in polymer mechanical performance across different stress states (tension, compression, torsion). Lastly, this work implements a hierarchical multiscale modeling methodology to examine parametric effects of heterogeneities on Polymer/Clay Nanocomposites (PCNs) mechanical performance under uncertainty. A Virtual Composite Structure Generator (VCSG) built three-dimensional periodic Representative Volume Elements (RVEs) coupled to the Bouvard ISV model and a Cohesive Zone Model (CZM) which featured a Traction-Separation (T-S) rule calibrated to results upscaled from Molecular Dynamics (MD) simulations. A DOE parametric examination utilized the RVEs to determine the relative effects of a selection of parameters on the mechanical performance of PCNs. DOE results determined that nanoclay particle orientation was the most influential parameter affecting PCN elastic modulus while intercalated interlamellar gallery strength had the greatest influence on PCN yield stress. Advisors/Committee Members: Mark F. Horstemeyer (chair), Tonya W. Stone (committee member), Mei Q. Chandler (committee member), Youssef Hammi (committee member).

Subjects/Keywords: constitutive modeling; finite element; ICME; Multiscale modeling; polymer modeling

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APA (6^th Edition):

Lawrimore, W. B. (2016). Multiscale modeling of multiphase polymers. (Doctoral Dissertation). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-04222016-122150/ ;

Chicago Manual of Style (16^th Edition):

Lawrimore, William Brantley. “Multiscale modeling of multiphase polymers.” 2016. Doctoral Dissertation, Mississippi State University. Accessed October 25, 2020. http://sun.library.msstate.edu/ETD-db/theses/available/etd-04222016-122150/ ;.

MLA Handbook (7^th Edition):

Lawrimore, William Brantley. “Multiscale modeling of multiphase polymers.” 2016. Web. 25 Oct 2020.

Vancouver:

Lawrimore WB. Multiscale modeling of multiphase polymers. [Internet] [Doctoral dissertation]. Mississippi State University; 2016. [cited 2020 Oct 25]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-04222016-122150/ ;.

Council of Science Editors:

Lawrimore WB. Multiscale modeling of multiphase polymers. [Doctoral Dissertation]. Mississippi State University; 2016. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-04222016-122150/ ;

Mississippi State University

10. Francis, David. An empirically validated multiscale continuum damage model for thermoplastic polymers subjected to variable strain rates.

Degree: PhD, Mechanical Engineering, 2013, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-04012013-094059/ ;

► This dissertation proposes a modied internal state variable (ISV) inelastic damage model that was motivated by experimental structure{property relations of thermoplastics. In particular, a… (more)

Subjects/Keywords: Internal State Variable; Viscoplastic Material; Thermoplastics; Constitutive Behavior; Damage modeling

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APA (6^th Edition):

Francis, D. (2013). An empirically validated multiscale continuum damage model for thermoplastic polymers subjected to variable strain rates. (Doctoral Dissertation). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-04012013-094059/ ;

Chicago Manual of Style (16^th Edition):

Francis, David. “An empirically validated multiscale continuum damage model for thermoplastic polymers subjected to variable strain rates.” 2013. Doctoral Dissertation, Mississippi State University. Accessed October 25, 2020. http://sun.library.msstate.edu/ETD-db/theses/available/etd-04012013-094059/ ;.

MLA Handbook (7^th Edition):

Francis, David. “An empirically validated multiscale continuum damage model for thermoplastic polymers subjected to variable strain rates.” 2013. Web. 25 Oct 2020.

Vancouver:

Francis D. An empirically validated multiscale continuum damage model for thermoplastic polymers subjected to variable strain rates. [Internet] [Doctoral dissertation]. Mississippi State University; 2013. [cited 2020 Oct 25]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-04012013-094059/ ;.

Council of Science Editors:

Francis D. An empirically validated multiscale continuum damage model for thermoplastic polymers subjected to variable strain rates. [Doctoral Dissertation]. Mississippi State University; 2013. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-04012013-094059/ ;

Mississippi State University

11. Tenev, Tichomir G. An elastic constitutive model of spacetime and its applications.

Degree: PhD, Computational Engineering, 2018, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10182018-181952/ ;

► We introduce an elastic constitutive model of gravity that enables the interpretation of cosmological observations in terms of established ideas from Solid Mechanics and multiscale… (more)

Subjects/Keywords: hierarchical length scales; dark matter; particle-mesh method; cosmic fabric; spacetime; constitutive model; modified gravity

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APA (6^th Edition):

Tenev, T. G. (2018). An elastic constitutive model of spacetime and its applications. (Doctoral Dissertation). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-10182018-181952/ ;

Chicago Manual of Style (16^th Edition):

Tenev, Tichomir G. “An elastic constitutive model of spacetime and its applications.” 2018. Doctoral Dissertation, Mississippi State University. Accessed October 25, 2020. http://sun.library.msstate.edu/ETD-db/theses/available/etd-10182018-181952/ ;.

MLA Handbook (7^th Edition):

Tenev, Tichomir G. “An elastic constitutive model of spacetime and its applications.” 2018. Web. 25 Oct 2020.

Vancouver:

Tenev TG. An elastic constitutive model of spacetime and its applications. [Internet] [Doctoral dissertation]. Mississippi State University; 2018. [cited 2020 Oct 25]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10182018-181952/ ;.

Council of Science Editors:

Tenev TG. An elastic constitutive model of spacetime and its applications. [Doctoral Dissertation]. Mississippi State University; 2018. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10182018-181952/ ;

Mississippi State University

12. Bowman, Andrew Lee. Multiscale damage and fracture modeling of polyethylene using molecular dynamics simulations and continuum internal state variable theory.

Degree: PhD, Mississippi State University, 2019, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-03212019-113345/ ;

► A multiscale model using simulated nanoscale damage (free volume) evolution and continuum damage evolution equations (void nucleation, growth, and coalescence) for the amorphous phase… (more)

Subjects/Keywords: voids; polymers; internal state variable theory; damage modeling; molecular dynamics simulations

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APA (6^th Edition):

Bowman, A. L. (2019). Multiscale damage and fracture modeling of polyethylene using molecular dynamics simulations and continuum internal state variable theory. (Doctoral Dissertation). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-03212019-113345/ ;

Chicago Manual of Style (16^th Edition):

Bowman, Andrew Lee. “Multiscale damage and fracture modeling of polyethylene using molecular dynamics simulations and continuum internal state variable theory.” 2019. Doctoral Dissertation, Mississippi State University. Accessed October 25, 2020. http://sun.library.msstate.edu/ETD-db/theses/available/etd-03212019-113345/ ;.

MLA Handbook (7^th Edition):

Bowman, Andrew Lee. “Multiscale damage and fracture modeling of polyethylene using molecular dynamics simulations and continuum internal state variable theory.” 2019. Web. 25 Oct 2020.

Vancouver:

Bowman AL. Multiscale damage and fracture modeling of polyethylene using molecular dynamics simulations and continuum internal state variable theory. [Internet] [Doctoral dissertation]. Mississippi State University; 2019. [cited 2020 Oct 25]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-03212019-113345/ ;.

Council of Science Editors:

Bowman AL. Multiscale damage and fracture modeling of polyethylene using molecular dynamics simulations and continuum internal state variable theory. [Doctoral Dissertation]. Mississippi State University; 2019. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-03212019-113345/ ;

13. Cho, Heechen. Three-dimensional Finite Element model for dynamics of the Earth's mantle using an Internal State Variable constitutive model.

Degree: PhD, Computational Engineering, 2019, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-03222019-091145/ ;

► This dissertation presents a numerical model constructed to investigate the dynamics and structures of the Earths mantle. Deformation of the Earths mantle, which is… (more)

▼ This dissertation presents a numerical model constructed to investigate the dynamics and structures of the Earths mantle. Deformation of the Earths mantle, which is composed of solid silicate minerals, is strongly governed by the constitutive relation-ship among multiple length-scale structures and properties. To explain the realistic consti-tutive behavior of the silicate mantle, an Internal State Variable (ISV) theory that is an advanced and novel constitutive approach for history-dependent elastoviscoplasticity was applied. The ISV constitutive model was, in turn, implemented into a three-dimensional geodynamic code, TERRA3D, which uses the Finite Element method developed for the mantle convection problem. The sequential studies performed in this dissertation are presented in the follow-ing order: i) a comprehensive summary of the mantle material structures (compositions and microstructural features) and its mechanical properties (elasticity and rheology), ii) a development of a recrystallization and grain size dependent ISV constitutive model for the polycrystalline materials such as minerals and metals, which explains comprehensive mineral physics occurring under the conditions of pressure, temperature, and strain rate within the mantle and their history dependence, and iii) an application of the recrystalli-zation and grain size dependent ISV model to the Earths mantle convection problem us-ing the TERRA3D for an investigation of the grain size and dynamic recrystallization ef-fect on the mantle dynamics. The applied ISV constitutive model within the TERRA3D Finite Element frame-work captures the subscale dynamics (dislocation density evolution, dynamic and static recrystallization, grain growth, and grain refinement) and their effect on the large-scale rheology and dynamics of the Earths mantle. The numerical investigations reveal that the potential for the mechanical instability and weakening within the mantle arises from the kinetics of grain size and recrystallization and their rheological effect. This mechanical instability leads to the mantle convection entering the episodic overturn regime. The TERRA3D-ISV mantle convection model herein also provides some insightful discover-ies regarding the dynamics and structures within the mantle, explaining its complex rhe-ology caused by the kinetics of recrystallization, grain size, hardening, dislocation recov-ery, and diffusion in the geological settings. Advisors/Committee Members: Youssef Hammi (committee member), Seongjai Kim (committee member), Ioana Banicescu (committee member), Mark F. Horstemeyer (chair).

Subjects/Keywords: finite element method; internal state variable; grain size; recrystallization; mineral deformation; mantle convection

12 more images…

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APA (6^th Edition):

Cho, H. (2019). Three-dimensional Finite Element model for dynamics of the Earth's mantle using an Internal State Variable constitutive model. (Doctoral Dissertation). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-03222019-091145/ ;

Chicago Manual of Style (16^th Edition):

Cho, Heechen. “Three-dimensional Finite Element model for dynamics of the Earth's mantle using an Internal State Variable constitutive model.” 2019. Doctoral Dissertation, Mississippi State University. Accessed October 25, 2020. http://sun.library.msstate.edu/ETD-db/theses/available/etd-03222019-091145/ ;.

MLA Handbook (7^th Edition):

Cho, Heechen. “Three-dimensional Finite Element model for dynamics of the Earth's mantle using an Internal State Variable constitutive model.” 2019. Web. 25 Oct 2020.

Vancouver:

Cho H. Three-dimensional Finite Element model for dynamics of the Earth's mantle using an Internal State Variable constitutive model. [Internet] [Doctoral dissertation]. Mississippi State University; 2019. [cited 2020 Oct 25]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-03222019-091145/ ;.

Council of Science Editors:

Cho H. Three-dimensional Finite Element model for dynamics of the Earth's mantle using an Internal State Variable constitutive model. [Doctoral Dissertation]. Mississippi State University; 2019. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-03222019-091145/ ;

Mississippi State University

14. Seely, Denver W. The process-structure-property relationships of a laser engineered net shaping (LENS) titanium-aluminum-vanadium alloy that is functionally graded with boron.

Degree: PhD, Mechanical Engineering, 2018, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-03202018-113136/ ;

► In this study, we quantified the Chemistry-Process-Structure-Property (CPSP) relations of a Ti-6Al-4V/TiB functionally graded material to assess its ability to withstand large deformations in a… (more)

Subjects/Keywords: Functionally Graded Material; Chemical-Process-Structure-Property Relationships; Digital Image Correlation; Boron; Borlite; Titanium; LENS; Additive Manufacturing; 3D Printing

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APA (6^th Edition):

Seely, D. W. (2018). The process-structure-property relationships of a laser engineered net shaping (LENS) titanium-aluminum-vanadium alloy that is functionally graded with boron. (Doctoral Dissertation). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-03202018-113136/ ;

Chicago Manual of Style (16^th Edition):

Seely, Denver W. “The process-structure-property relationships of a laser engineered net shaping (LENS) titanium-aluminum-vanadium alloy that is functionally graded with boron.” 2018. Doctoral Dissertation, Mississippi State University. Accessed October 25, 2020. http://sun.library.msstate.edu/ETD-db/theses/available/etd-03202018-113136/ ;.

MLA Handbook (7^th Edition):

Seely, Denver W. “The process-structure-property relationships of a laser engineered net shaping (LENS) titanium-aluminum-vanadium alloy that is functionally graded with boron.” 2018. Web. 25 Oct 2020.

Vancouver:

Seely DW. The process-structure-property relationships of a laser engineered net shaping (LENS) titanium-aluminum-vanadium alloy that is functionally graded with boron. [Internet] [Doctoral dissertation]. Mississippi State University; 2018. [cited 2020 Oct 25]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-03202018-113136/ ;.

Council of Science Editors:

Seely DW. The process-structure-property relationships of a laser engineered net shaping (LENS) titanium-aluminum-vanadium alloy that is functionally graded with boron. [Doctoral Dissertation]. Mississippi State University; 2018. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-03202018-113136/ ;

Mississippi State University

15. Kapil, Janit. TWIN NUCLEATION, TWIN PROPAGATION, TWIN-SLIP INTERACTIONS, PSEUDO-ELASTICITY, STRAIN-RATE SENSITIVITY AND NON-SCHMID'S EFFECTS OF {101¯2} TWINNING IN MAGNESIUM VIA IN-SITU EBSD.

Degree: MS, Mechanical Engineering, 2011, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-03302011-182638/ ;

► In-situ EBSD on profuse {10ˉ12} twinning in magnesium revealed that the twinning stress for nucleation is not totally rate-insensitive but highly dependent on grain… (more)

Subjects/Keywords: strain-rate dependence; grain misorientation; Non-Schmid's effects; twin-twin hardening; pseudo-elasticity; twin propagation; In-situ EBSD; twin nucleation

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APA (6^th Edition):

Kapil, J. (2011). TWIN NUCLEATION, TWIN PROPAGATION, TWIN-SLIP INTERACTIONS, PSEUDO-ELASTICITY, STRAIN-RATE SENSITIVITY AND NON-SCHMID'S EFFECTS OF {101¯2} TWINNING IN MAGNESIUM VIA IN-SITU EBSD. (Masters Thesis). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-03302011-182638/ ;

Chicago Manual of Style (16^th Edition):

Kapil, Janit. “TWIN NUCLEATION, TWIN PROPAGATION, TWIN-SLIP INTERACTIONS, PSEUDO-ELASTICITY, STRAIN-RATE SENSITIVITY AND NON-SCHMID'S EFFECTS OF {101¯2} TWINNING IN MAGNESIUM VIA IN-SITU EBSD.” 2011. Masters Thesis, Mississippi State University. Accessed October 25, 2020. http://sun.library.msstate.edu/ETD-db/theses/available/etd-03302011-182638/ ;.

MLA Handbook (7^th Edition):

Kapil, Janit. “TWIN NUCLEATION, TWIN PROPAGATION, TWIN-SLIP INTERACTIONS, PSEUDO-ELASTICITY, STRAIN-RATE SENSITIVITY AND NON-SCHMID'S EFFECTS OF {101¯2} TWINNING IN MAGNESIUM VIA IN-SITU EBSD.” 2011. Web. 25 Oct 2020.

Vancouver:

Kapil J. TWIN NUCLEATION, TWIN PROPAGATION, TWIN-SLIP INTERACTIONS, PSEUDO-ELASTICITY, STRAIN-RATE SENSITIVITY AND NON-SCHMID'S EFFECTS OF {101¯2} TWINNING IN MAGNESIUM VIA IN-SITU EBSD. [Internet] [Masters thesis]. Mississippi State University; 2011. [cited 2020 Oct 25]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-03302011-182638/ ;.

Council of Science Editors:

Kapil J. TWIN NUCLEATION, TWIN PROPAGATION, TWIN-SLIP INTERACTIONS, PSEUDO-ELASTICITY, STRAIN-RATE SENSITIVITY AND NON-SCHMID'S EFFECTS OF {101¯2} TWINNING IN MAGNESIUM VIA IN-SITU EBSD. [Masters Thesis]. Mississippi State University; 2011. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-03302011-182638/ ;

Mississippi State University

16. Parkar, Abdul Afoo H. ON MODELING AND EXPERIMENTAL VALIDATION OF EXTRUSION PROCESS OF LIGHTWEIGHT ALLOYS.

Degree: MS, Mechanical Engineering, 2011, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-04292011-165856/ ;

► Laboratory-scale extrusion facilitated a parametric study of the metal extrusion process under controlled conditions. Hot extrusion experiments were performed on billets of both aluminum… (more)

Subjects/Keywords: Extrusion; Al1100; AM30; AZ61; Modeling; HyperXtrude; Experimental; Validation; Texture

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APA (6^th Edition):

Parkar, A. A. H. (2011). ON MODELING AND EXPERIMENTAL VALIDATION OF EXTRUSION PROCESS OF LIGHTWEIGHT ALLOYS. (Masters Thesis). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-04292011-165856/ ;

Chicago Manual of Style (16^th Edition):

Parkar, Abdul Afoo H. “ON MODELING AND EXPERIMENTAL VALIDATION OF EXTRUSION PROCESS OF LIGHTWEIGHT ALLOYS.” 2011. Masters Thesis, Mississippi State University. Accessed October 25, 2020. http://sun.library.msstate.edu/ETD-db/theses/available/etd-04292011-165856/ ;.

MLA Handbook (7^th Edition):

Parkar, Abdul Afoo H. “ON MODELING AND EXPERIMENTAL VALIDATION OF EXTRUSION PROCESS OF LIGHTWEIGHT ALLOYS.” 2011. Web. 25 Oct 2020.

Vancouver:

Parkar AAH. ON MODELING AND EXPERIMENTAL VALIDATION OF EXTRUSION PROCESS OF LIGHTWEIGHT ALLOYS. [Internet] [Masters thesis]. Mississippi State University; 2011. [cited 2020 Oct 25]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-04292011-165856/ ;.

Council of Science Editors:

Parkar AAH. ON MODELING AND EXPERIMENTAL VALIDATION OF EXTRUSION PROCESS OF LIGHTWEIGHT ALLOYS. [Masters Thesis]. Mississippi State University; 2011. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-04292011-165856/ ;

Mississippi State University

17. Hajianmaleki, Mehdi. STATIC AND VIBRATION ANALYSIS OF THICK GENERALLY LAMINATED COMPOSITE DEEP CURVED BEAMS.

Degree: PhD, Mechanical Engineering, 2011, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-11022011-030129/ ;

► A rigorous first order shear deformation theory (FSDT) is employed along with modified ABD parameters to analyze static and free vibration behavior of generally… (more)

▼ A rigorous first order shear deformation theory (FSDT) is employed along with modified ABD parameters to analyze static and free vibration behavior of generally laminated beams and shafts. Different approaches for calculating composite beam stiffness parameters have been considered and the most accurate one that accounts for material couplings have been used to analyze static and free vibration behaviors of straight beams with different laminates and boundary conditions. In order to analyze curved beams, the term (1+z/R) is exactly integrated into ABD parameters formulation and an equivalent modulus of elasticity is used instead of traditional stiffness terms to account for both the deepness and material coupling of the beam structures. The model has been solved analytically for simply supported boundary conditions and the general differential quadrature (GDQ) technique has been used for other boundary conditions. The results for deflection, moment resultants, and natural frequencies of straight and curved beams with different deepness ratio (often called depth ratio), slenderness ratio, lamination, and boundary conditions are compared with those obtained from accurate three dimensional finite element simulations using ANSYS. The results were in close proximity to three dimensional finite element results. The model is then applied to transverse vibration analysis of multi-span generally laminated composite shafts with a lumped mass using GDQ. The results for natural frequencies are compared to experimental and other analytical models as well as finite element simulation. The results in the present analyses were found accurate. Conclusively, it has been shown that when considering more accurate stiffness parameters, a First Order Shear Deformation Theory can accurately predict static and free vibration behaviors of composite beams and multispan shafts of any deepness, lamination and boundary conditions. Advisors/Committee Members: Mark F. Horstemeyer (committee member), Mohamad S. Qatu (chair), Oliver Myers (committee member), Rani W. Sullivan (committee member).

Subjects/Keywords: Beam; Composite; Shaft; Vibration; Static; Deep

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APA (6^th Edition):

Hajianmaleki, M. (2011). STATIC AND VIBRATION ANALYSIS OF THICK GENERALLY LAMINATED COMPOSITE DEEP CURVED BEAMS. (Doctoral Dissertation). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-11022011-030129/ ;

Chicago Manual of Style (16^th Edition):

Hajianmaleki, Mehdi. “STATIC AND VIBRATION ANALYSIS OF THICK GENERALLY LAMINATED COMPOSITE DEEP CURVED BEAMS.” 2011. Doctoral Dissertation, Mississippi State University. Accessed October 25, 2020. http://sun.library.msstate.edu/ETD-db/theses/available/etd-11022011-030129/ ;.

MLA Handbook (7^th Edition):

Hajianmaleki, Mehdi. “STATIC AND VIBRATION ANALYSIS OF THICK GENERALLY LAMINATED COMPOSITE DEEP CURVED BEAMS.” 2011. Web. 25 Oct 2020.

Vancouver:

Hajianmaleki M. STATIC AND VIBRATION ANALYSIS OF THICK GENERALLY LAMINATED COMPOSITE DEEP CURVED BEAMS. [Internet] [Doctoral dissertation]. Mississippi State University; 2011. [cited 2020 Oct 25]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-11022011-030129/ ;.

Council of Science Editors:

Hajianmaleki M. STATIC AND VIBRATION ANALYSIS OF THICK GENERALLY LAMINATED COMPOSITE DEEP CURVED BEAMS. [Doctoral Dissertation]. Mississippi State University; 2011. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-11022011-030129/ ;

Mississippi State University

18. Dixit, Vivek. First principles investigation of substituted strontium hexaferrite.

Degree: PhD, Physics and Astronomy, 2015, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10202015-121304/ ;

► This dissertation investigates how the magnetic properties of strontium hexaferrite change upon the substitution of foreign atoms at the Fe sites. Strontium hexaferrite, SrFe₁₂O₁₉… (more)

▼ This dissertation investigates how the magnetic properties of strontium hexaferrite change upon the substitution of foreign atoms at the Fe sites. Strontium hexaferrite, SrFe₁₂O₁₉ is a commonly used hard magnetic material and is produced in large quantities (around 500,000 tons per year). For different applications of strontium hexaferrite, its magnetic properties can be tuned by a proper substitution of the foreign atoms. Experimental screening for a proper substitution is a cost-intensive and time-consuming process, whereas computationally it can be done more efficiently. We used the density functional theory a first principles based method to study substituted strontium hexaferrite. The site occupancies of the substituted atoms were estimated by calculating the substitution energies of different configurations. The formation probabilities of configurations were used to calculate the magnetic properties of substituted strontium hexaferrite. In the first study, Al-substituted strontium hexaferrite, SrFe12-xAl x O₁₉, with x = 0.5 and x = 1.0 were investigated. It was found that at the annealing temperature the nonmagnetic Al⁺³ ions preferentially replace Fe⁺³ ions from the 12k and 2a sites. We found that the magnetization decreases and the magnetic anisotropy field increases as the fraction, x of the Al atoms increases. In the second study, SrFe12-x Gax O₁₉ and SrFe12-x Inx O₁₉ with x = 0.5 and x = 1.0 were investigated. In the case of SrFe12-x Gax O₁₉, the sites where Ga⁺³ ions prefer to enter are: 12k, 2a, and 4f₁. For SrFe12-x Inx O₁₉, In⁺³ ions most likely to occupy the 12k, 4f₁, and 4f₂ sites. In both cases the magnetization was found to decrease slightly as the fraction of substituted atom increases. The magnetic anisotropy field increased for SrFe12-x Gax O₁₉, and decreased for SrFe12-x Inx O₁₉ as the concentration of substituted atoms increased. In the third study, 23 elements (M) were screened for their possible substitution in strontium hexaferrite, SrFe12-x Mx O₁₉ with x = 0.5. In each case the site preference of the substituted atom and the magnetic properties were calculated. We found that Bi, Ge, Sb, Sn, and Sc can effectively increase the magnetization, and Cr, P, Co, Al, Ga, and Ti can increase the anisotropy field when substituted into strontium hexaferrite. Advisors/Committee Members: Seong-Gon Kim (chair), Mark F. Horstemeyer (committee member), Mark A. Novotny (committee member), Steven R. Gwaltney (committee member), R. Torsten Clay (committee member).

Subjects/Keywords: Substitution; Strontium Hexaferrite; Density Functional Theory; Site Preference; Magnetization; Magnetic Anisotropy.

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APA (6^th Edition):

Dixit, V. (2015). First principles investigation of substituted strontium hexaferrite. (Doctoral Dissertation). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-10202015-121304/ ;

Chicago Manual of Style (16^th Edition):

Dixit, Vivek. “First principles investigation of substituted strontium hexaferrite.” 2015. Doctoral Dissertation, Mississippi State University. Accessed October 25, 2020. http://sun.library.msstate.edu/ETD-db/theses/available/etd-10202015-121304/ ;.

MLA Handbook (7^th Edition):

Dixit, Vivek. “First principles investigation of substituted strontium hexaferrite.” 2015. Web. 25 Oct 2020.

Vancouver:

Dixit V. First principles investigation of substituted strontium hexaferrite. [Internet] [Doctoral dissertation]. Mississippi State University; 2015. [cited 2020 Oct 25]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10202015-121304/ ;.

Council of Science Editors:

Dixit V. First principles investigation of substituted strontium hexaferrite. [Doctoral Dissertation]. Mississippi State University; 2015. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10202015-121304/ ;

Mississippi State University

19. Rush, Gustavus Alston. Design of an American football helmet liner for concussion mitigation.

Degree: PhD, Agricultural and Biological Engineering, 2016, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-06212016-171720/ ;

► The objective of this research was to develop an optimal design for a polymeric American football helmet liner for concussion prevention utilizing experiments and… (more)

Subjects/Keywords: design of experiments optimization; Head Injury Criterion; Gadd Severity Index; National Operating Committee on Standards for Athl; helmet impact testing; Concussion; Finite Element Analysis; American football

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APA (6^th Edition):

Rush, G. A. (2016). Design of an American football helmet liner for concussion mitigation. (Doctoral Dissertation). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-06212016-171720/ ;

Chicago Manual of Style (16^th Edition):

Rush, Gustavus Alston. “Design of an American football helmet liner for concussion mitigation.” 2016. Doctoral Dissertation, Mississippi State University. Accessed October 25, 2020. http://sun.library.msstate.edu/ETD-db/theses/available/etd-06212016-171720/ ;.

MLA Handbook (7^th Edition):

Rush, Gustavus Alston. “Design of an American football helmet liner for concussion mitigation.” 2016. Web. 25 Oct 2020.

Vancouver:

Rush GA. Design of an American football helmet liner for concussion mitigation. [Internet] [Doctoral dissertation]. Mississippi State University; 2016. [cited 2020 Oct 25]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-06212016-171720/ ;.

Council of Science Editors:

Rush GA. Design of an American football helmet liner for concussion mitigation. [Doctoral Dissertation]. Mississippi State University; 2016. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-06212016-171720/ ;

Mississippi State University

20. Scott, Dylan Andrew. Introducing new energy dissipation mechanisms for steel fiber reinforcement in ultra-high performance concrete.

Degree: MS, Mechanical Engineering, 2017, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10262017-160054/ ;

► By adding annealed plain carbon steel fibers and stainless steel fibers into Ultra-High Performance Concrete (UHPC), we have increased UHPCs toughness through optimized thermal processing… (more)

Subjects/Keywords: UHPC; steel fiber reinforcement; fiber reinforced concrete

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APA (6^th Edition):

Scott, D. A. (2017). Introducing new energy dissipation mechanisms for steel fiber reinforcement in ultra-high performance concrete. (Masters Thesis). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-10262017-160054/ ;

Chicago Manual of Style (16^th Edition):

Scott, Dylan Andrew. “Introducing new energy dissipation mechanisms for steel fiber reinforcement in ultra-high performance concrete.” 2017. Masters Thesis, Mississippi State University. Accessed October 25, 2020. http://sun.library.msstate.edu/ETD-db/theses/available/etd-10262017-160054/ ;.

MLA Handbook (7^th Edition):

Scott, Dylan Andrew. “Introducing new energy dissipation mechanisms for steel fiber reinforcement in ultra-high performance concrete.” 2017. Web. 25 Oct 2020.

Vancouver:

Scott DA. Introducing new energy dissipation mechanisms for steel fiber reinforcement in ultra-high performance concrete. [Internet] [Masters thesis]. Mississippi State University; 2017. [cited 2020 Oct 25]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10262017-160054/ ;.

Council of Science Editors:

Scott DA. Introducing new energy dissipation mechanisms for steel fiber reinforcement in ultra-high performance concrete. [Masters Thesis]. Mississippi State University; 2017. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10262017-160054/ ;

Mississippi State University

21. Fuller, Robert William. Fatigue life and crack growth prediction of irradiated stainless steels.

Degree: PhD, Mechanical Engineering, 2018, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-01312018-183421/ ;

► One of prominent issues related to failures in nuclear power components is attributed to material degradation due the aggressive environment conditions, and mechanical stresses.… (more)

▼ One of prominent issues related to failures in nuclear power components is attributed to material degradation due the aggressive environment conditions, and mechanical stresses. For instance, reactor core support components, such as fuel claddings, are under prolonged exposure to an intense neutron field from the fission of fuel and operate at elevated temperature under fatigue loadings caused by start up, shut down, and unscheduled emergency shut down. Additionally, exposure to high-fluence neutron radiation can lead to microscopic defects that result in material hardening and embrittlement, which significantly affects the physical and mechanical properties of the materials, resulting in further reduction in fatigue life of reactor structural components. The effects of fatigue damage on material deterioration can be further exacerbated by the presence of thermal loading, hold-time, and high-temperature water coolant environments. In this study, uniaxial fatigue models were used to predict fatigue behavior based only on simple monotonic properties including ultimate tensile strength and Brinell hardness. Two existing models, the Bäumel Seeger uniform material law and the Roessle Fatemi hardness method, were employed and extended to include the effects of test temperature, neutron irradiation fluence, irradiation induced helium and irradiation induced swellings on fatigue life of austenitic stainless steels. Furthermore, a methodology to estimate fatigue crack length using a strip-yield based model is presented. This methodology is also extended to address the effect of creep deformation in a presence of hold- times, and expanded to include the effects of irradiation and water environment. Reasonable fatigue life predictions and crack growth estimations are obtained for irradiated austenitic stainless steels types 304, 304L, and 316, when compared to the experimental data available in the literature. Lastly, a failure analysis methodology of a mixer unit shaft made of AISI 304 stainless steel is also presented using a conventional 14-step failure analysis approach. The primary mode of failure is identified to be intergranular stress cracking at the heat affected zones. A means of circumventing this type of failure in the future is presented. Advisors/Committee Members: Haitham El Kadiri (chair), Nima Shamsaei (chair), Mark F. Horstemeyer (committee member), James C. Newman (committee member), Yucheng Liu (committee member).

Subjects/Keywords: irradiated stainless steel; fracture surface failure analysis; heat affected zones; intergrannular stress cracking; irradiation-induced helium; void swelling; stainless steel; life prediction; crack growth estimation; elevated temperature; creep-fatigue; neutron irradiation; Strip yield model

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APA (6^th Edition):

Fuller, R. W. (2018). Fatigue life and crack growth prediction of irradiated stainless steels. (Doctoral Dissertation). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-01312018-183421/ ;

Chicago Manual of Style (16^th Edition):

Fuller, Robert William. “Fatigue life and crack growth prediction of irradiated stainless steels.” 2018. Doctoral Dissertation, Mississippi State University. Accessed October 25, 2020. http://sun.library.msstate.edu/ETD-db/theses/available/etd-01312018-183421/ ;.

MLA Handbook (7^th Edition):

Fuller, Robert William. “Fatigue life and crack growth prediction of irradiated stainless steels.” 2018. Web. 25 Oct 2020.

Vancouver:

Fuller RW. Fatigue life and crack growth prediction of irradiated stainless steels. [Internet] [Doctoral dissertation]. Mississippi State University; 2018. [cited 2020 Oct 25]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-01312018-183421/ ;.

Council of Science Editors:

Fuller RW. Fatigue life and crack growth prediction of irradiated stainless steels. [Doctoral Dissertation]. Mississippi State University; 2018. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-01312018-183421/ ;

Mississippi State University

22. Guerra, Marta Licelis. DYNAMICS OF CLASSICAL PARTICLES AND QUANTUM SPIN SYSTEMS.

Degree: PhD, Physics and Astronomy, 2011, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-03312011-104656/ ;

► This dissertation is divided in two parts. In the first part, we study the dynamics of a classical particle system. We calculate the efficiency… (more)

▼ This dissertation is divided in two parts. In the first part, we study the dynamics of a classical particle system. We calculate the efficiency of a rejection-free dynamic Monte Carlo method in the limit of low temperatures and/or high densities for d-dimensional off-lattice homogeneous particles interacting through a repulsive power-law potential r^−p. Theoretically we find the algorithmic efficiency is asymptotically proportional to ρ (p+2)/2 T-d/2 with the particle density ρ and the temperature T. Dynamic Monte Carlo simulations are performed in 1-, 2- and 3-dimensional systems with different powers p, and the results agree with the theoretical predictions. In the second part, we study the dynamics of a quantum spin 1/2 system. We calculate the average of the z component of the spin operator <S^z(t)> when one spin 1/2 particle is interacting with one, two, and three baths of 1/2-integer spins. For the cases of one and two baths we find the asymptotic behavior of <S^z(t)> and the quantum purity P(t) using the density of states of the system. In both cases <S^z(t)> and P(t) decay, exponentially for a single bath and algebraically for two baths. We present simulations in real time for one spin 1/2 particle coupled to one or two baths of 1/2-integer spins. The simulations were performed using the algorithm and code of Prof. De Raedt. We first simulated one spin coupled to one or two spin-baths with no interactions between the bath spins to compare with the theoretical calculations. We extend these simulations by introducing random interactions between the bath spins, in an attempt to reach the asymptotic decay rate at earlier times and for fewer spins in the baths. We also perform preliminary studies of the correlations of two and six spin 1/2 particles coupled to one, or two bath of spins, as a step to investigate quantum synchronization. We introduce a preliminary result for the spectral density of a spin-bath system, a promising quantity to measure the synchronization of spin systems. Advisors/Committee Members: Mark A. Novotny (chair), Seong-Gon Kim (committee member), Torsten Clay (committee member), Mark F. Horstemeyer (committee member), Tonya Stone (committee member).

Subjects/Keywords: quantum synchronization; spin interactions; time evolution

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APA (6^th Edition):

Guerra, M. L. (2011). DYNAMICS OF CLASSICAL PARTICLES AND QUANTUM SPIN SYSTEMS. (Doctoral Dissertation). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-03312011-104656/ ;

Chicago Manual of Style (16^th Edition):

Guerra, Marta Licelis. “DYNAMICS OF CLASSICAL PARTICLES AND QUANTUM SPIN SYSTEMS.” 2011. Doctoral Dissertation, Mississippi State University. Accessed October 25, 2020. http://sun.library.msstate.edu/ETD-db/theses/available/etd-03312011-104656/ ;.

MLA Handbook (7^th Edition):

Guerra, Marta Licelis. “DYNAMICS OF CLASSICAL PARTICLES AND QUANTUM SPIN SYSTEMS.” 2011. Web. 25 Oct 2020.

Vancouver:

Guerra ML. DYNAMICS OF CLASSICAL PARTICLES AND QUANTUM SPIN SYSTEMS. [Internet] [Doctoral dissertation]. Mississippi State University; 2011. [cited 2020 Oct 25]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-03312011-104656/ ;.

Council of Science Editors:

Guerra ML. DYNAMICS OF CLASSICAL PARTICLES AND QUANTUM SPIN SYSTEMS. [Doctoral Dissertation]. Mississippi State University; 2011. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-03312011-104656/ ;

Mississippi State University

23. Eshraghi Kakhki, Mohsen. Modeling dendritic solidification using lattice Boltzmann and cellular automaton methods.

Degree: PhD, Mechanical Engineering, 2013, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-07012013-105749/ ;

► This dissertation presents the development of numerical models based on lattice Boltzmann (LB) and cellular automaton (CA) methods for solving phase change and microstructural… (more)

▼ This dissertation presents the development of numerical models based on lattice Boltzmann (LB) and cellular automaton (CA) methods for solving phase change and microstructural evolution problems. First, a new variation of the LB method is discussed for solving the heat conduction problem with phase change. In contrast to previous explicit algorithms, the latent heat source term is treated implicitly in the energy equation, avoiding iteration steps and improving the formulation stability and efficiency. The results showed that the model can deal with phase change problems more accurately and efficiently than explicit LB models. Furthermore, a new numerical technique is introduced for simulating dendrite growth in three dimensions. The LB method is used to calculate the transport phenomena and the CA is employed to capture the solid/liquid interface. It is assumed that the dendritic growth is driven by the difference between the local actual and local equilibrium composition of the liquid in the interface. The evolution of a threedimensional (3D) dendrite is discussed. In addition, the effect of undercooling and degree of anisotropy on the kinetics of dendrite growth is studied. Moreover, effect of melt convection on dendritic solidification is investigated using 3D simulations. It is shown that convection can change the kinetics of growth by affecting the solute distribution around the dendrite. The growth features of twodimensional (2D) and 3D dendrites are compared. Furthermore, the change in growth kinetics and morphology of Al-Cu dendrites is studied by altering melt undercooling, alloy composition and inlet flow velocity. The local-type nature of LB and CA methods enables efficient scaling of the model in petaflops supercomputers, allowing the simulation of large domains in 3D. The model capabilities with large scale simulations of dendritic solidification are discussed and the parallel performance of the algorithm is assessed. Excellent strong scaling up to thousands of computing cores is obtained across the nodes of a computer cluster, along with near-perfect weak scaling. Considering the advantages offered by the presented model, it can be used as a new tool for simulating 3D dendritic solidification under convection. Advisors/Committee Members: Dr. Rogelio Luck (committee member), Dr. Mark F. Horstemeyer (committee member), Dr. Sergio D. Felicelli (chair), Dr. Mohsen Asle Zaeem (committee member).

Subjects/Keywords: Solidification; Dendrite growth; Lattice Boltzmann; Cellular automaton

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APA (6^th Edition):

Eshraghi Kakhki, M. (2013). Modeling dendritic solidification using lattice Boltzmann and cellular automaton methods. (Doctoral Dissertation). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-07012013-105749/ ;

Chicago Manual of Style (16^th Edition):

Eshraghi Kakhki, Mohsen. “Modeling dendritic solidification using lattice Boltzmann and cellular automaton methods.” 2013. Doctoral Dissertation, Mississippi State University. Accessed October 25, 2020. http://sun.library.msstate.edu/ETD-db/theses/available/etd-07012013-105749/ ;.

MLA Handbook (7^th Edition):

Eshraghi Kakhki, Mohsen. “Modeling dendritic solidification using lattice Boltzmann and cellular automaton methods.” 2013. Web. 25 Oct 2020.

Vancouver:

Eshraghi Kakhki M. Modeling dendritic solidification using lattice Boltzmann and cellular automaton methods. [Internet] [Doctoral dissertation]. Mississippi State University; 2013. [cited 2020 Oct 25]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-07012013-105749/ ;.

Council of Science Editors:

Eshraghi Kakhki M. Modeling dendritic solidification using lattice Boltzmann and cellular automaton methods. [Doctoral Dissertation]. Mississippi State University; 2013. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-07012013-105749/ ;

Mississippi State University

24. Begonia, Mark Gregory. Differentiating the characteristic response of the brain after exposure to blunt and blast trauma.

Degree: PhD, Agricultural and Biological Engineering, 2013, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-11012013-094517/ ;

► Military personnel often experience mild traumatic brain injury (mTBI) from exposure to improvised explosive devices (IEDs). Soldiers typically endure blast trauma from the IED… (more)

▼ Military personnel often experience mild traumatic brain injury (mTBI) from exposure to improvised explosive devices (IEDs). Soldiers typically endure blast trauma from the IED pressure wave as well as blunt trauma from ensuing head impacts. Researchers have not reached a consensus on whether the biomechanical response from blunt or blast trauma plays a more dominant role in mTBI because the specific biomechanical sources of injury are often undetermined. Consequently, the goal of this dissertation was to conduct three separate studies in order to characterize the mechanical behavior of the brain after exposure to mTBI conditions. For Study 1, mild blunt and blast trauma were induced in Sprague-Dawley rats using a custom-built device. In-house diffusion tensor imaging (DTI) software was used to make 3-D reconstructions of white matter fiber tracts before and after injury (1, 4, and 7 days). Axonal integrity was characterized by examining the fiber count, fiber length, and fractional anisotropy (FA). In-house image analysis software also quantified the microstructural variations in Hematoxylin and Eosin (H&E) stained brain sections, where significant differences in parameters such as the area fraction (AF) and nearest neighbor distance (NND) correlated to voids that formed after water diffused extracellularly from axons. Study 2 employed a computational approach involving the development of a finite element (FE) model for the rat head followed by the simulation of blunt and blast trauma, respectively. FE parameters such as von Mises stress, pressure, and maximum principal strain were analyzed at various locations including the skull, cerebral cortex, corpus callosum, and hypothalamus to compare injury cases. Study 3 involved interruption mechanical testing of porcine brain, a suitable animal surrogate of human brain. Compression, tension, and shear experiments were performed at a strain rate of 0.1 s^-1 to examine the differential mechanical response. Microstructural changes in H&E stained brain sections were analyzed with in-house image analysis software to quantify differences among stress states at strains of 0.15, 0.30, and 0.40. Studies 1 and 2 confirmed that the brain behaves differently in response to blunt and blast trauma, respectively, while Study 3 further demonstrated the stress state dependent behavior of brain tissue. Advisors/Committee Members: Lakiesha N. Williams (chair), Jun Liao (committee member), Rajkumar Prabhu (committee member), Mark F. Horstemeyer (committee member), Avery James Cooley (committee member).

Subjects/Keywords: traumatic brain injury; blunt; blast; diffusion tensor imaging; image analysis; finite element; stress state

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APA (6^th Edition):

Begonia, M. G. (2013). Differentiating the characteristic response of the brain after exposure to blunt and blast trauma. (Doctoral Dissertation). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-11012013-094517/ ;

Chicago Manual of Style (16^th Edition):

Begonia, Mark Gregory. “Differentiating the characteristic response of the brain after exposure to blunt and blast trauma.” 2013. Doctoral Dissertation, Mississippi State University. Accessed October 25, 2020. http://sun.library.msstate.edu/ETD-db/theses/available/etd-11012013-094517/ ;.

MLA Handbook (7^th Edition):

Begonia, Mark Gregory. “Differentiating the characteristic response of the brain after exposure to blunt and blast trauma.” 2013. Web. 25 Oct 2020.

Vancouver:

Begonia MG. Differentiating the characteristic response of the brain after exposure to blunt and blast trauma. [Internet] [Doctoral dissertation]. Mississippi State University; 2013. [cited 2020 Oct 25]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-11012013-094517/ ;.

Council of Science Editors:

Begonia MG. Differentiating the characteristic response of the brain after exposure to blunt and blast trauma. [Doctoral Dissertation]. Mississippi State University; 2013. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-11012013-094517/ ;

25. Mayatt, Adam. Structure-property relationships of an A36 steel alloy under dynamic loading conditions.

Degree: MS, Mechanical Engineering, 2012, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-11022012-131659/ ;

► Structure-property quantification of an A36 steel alloy was the focus of this study in order to calibrate and validate a plasticity-damage model. The microstructural… (more)

Subjects/Keywords: A36 steel alloy; low carbon steel; Dynamic loading; Dynamic strain aging; Hopkinson; High rate testing; Material characteristics; Facture surfaces; A36 hot rolled plate; Plasticity damage model; Chemical composition by weight percent

…property relationships to calibrate and validate the Mississippi State University (MSU)…

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APA (6^th Edition):

Mayatt, A. (2012). Structure-property relationships of an A36 steel alloy under dynamic loading conditions. (Masters Thesis). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-11022012-131659/ ;

Chicago Manual of Style (16^th Edition):

Mayatt, Adam. “Structure-property relationships of an A36 steel alloy under dynamic loading conditions.” 2012. Masters Thesis, Mississippi State University. Accessed October 25, 2020. http://sun.library.msstate.edu/ETD-db/theses/available/etd-11022012-131659/ ;.

MLA Handbook (7^th Edition):

Mayatt, Adam. “Structure-property relationships of an A36 steel alloy under dynamic loading conditions.” 2012. Web. 25 Oct 2020.

Vancouver:

Mayatt A. Structure-property relationships of an A36 steel alloy under dynamic loading conditions. [Internet] [Masters thesis]. Mississippi State University; 2012. [cited 2020 Oct 25]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-11022012-131659/ ;.

Council of Science Editors:

Mayatt A. Structure-property relationships of an A36 steel alloy under dynamic loading conditions. [Masters Thesis]. Mississippi State University; 2012. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-11022012-131659/ ;

26. Kistler, Harold Michael. A STUDY OF THE MICROSTRUCTURAL EVOLUTION AND STATIC RECRYSTALLIZATION OF MAGNESIUM ALLOY AZ31.

Degree: MS, Mechanical Engineering, 2012, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-03282012-144113/ ;

► The present study focuses on the evolving microstructure of Mg alloy AZ31. The material is subjected to channel die compression at room temperature to… (more)

Subjects/Keywords: AZ31; channel die compression; room temperature; static recrystallization; microstructure; annealing; grain size; microhardness

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APA (6^th Edition):

Kistler, H. M. (2012). A STUDY OF THE MICROSTRUCTURAL EVOLUTION AND STATIC RECRYSTALLIZATION OF MAGNESIUM ALLOY AZ31. (Masters Thesis). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-03282012-144113/ ;

Chicago Manual of Style (16^th Edition):

Kistler, Harold Michael. “A STUDY OF THE MICROSTRUCTURAL EVOLUTION AND STATIC RECRYSTALLIZATION OF MAGNESIUM ALLOY AZ31.” 2012. Masters Thesis, Mississippi State University. Accessed October 25, 2020. http://sun.library.msstate.edu/ETD-db/theses/available/etd-03282012-144113/ ;.

MLA Handbook (7^th Edition):

Kistler, Harold Michael. “A STUDY OF THE MICROSTRUCTURAL EVOLUTION AND STATIC RECRYSTALLIZATION OF MAGNESIUM ALLOY AZ31.” 2012. Web. 25 Oct 2020.

Vancouver:

Kistler HM. A STUDY OF THE MICROSTRUCTURAL EVOLUTION AND STATIC RECRYSTALLIZATION OF MAGNESIUM ALLOY AZ31. [Internet] [Masters thesis]. Mississippi State University; 2012. [cited 2020 Oct 25]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-03282012-144113/ ;.

Council of Science Editors:

Kistler HM. A STUDY OF THE MICROSTRUCTURAL EVOLUTION AND STATIC RECRYSTALLIZATION OF MAGNESIUM ALLOY AZ31. [Masters Thesis]. Mississippi State University; 2012. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-03282012-144113/ ;

27. Simmons, Jason Mark. A PHENOMENOLOGICAL MODEL FOR DYNAMIC RECRYSTALLIZATION.

Degree: MS, Mechanical Engineering, 2011, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-04082011-165657/ ;

► The present study develops a phenomenological adaptation to an internal state variable (ISV) model that incorporates the influence of dynamic recrystallization (DRX) in a… (more)

Subjects/Keywords: strain rate; grain size; constitutive model; microstructure; recrystallization; temperature; stress; hardening

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APA (6^th Edition):

Simmons, J. M. (2011). A PHENOMENOLOGICAL MODEL FOR DYNAMIC RECRYSTALLIZATION. (Masters Thesis). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-04082011-165657/ ;

Chicago Manual of Style (16^th Edition):

Simmons, Jason Mark. “A PHENOMENOLOGICAL MODEL FOR DYNAMIC RECRYSTALLIZATION.” 2011. Masters Thesis, Mississippi State University. Accessed October 25, 2020. http://sun.library.msstate.edu/ETD-db/theses/available/etd-04082011-165657/ ;.

MLA Handbook (7^th Edition):

Simmons, Jason Mark. “A PHENOMENOLOGICAL MODEL FOR DYNAMIC RECRYSTALLIZATION.” 2011. Web. 25 Oct 2020.

Vancouver:

Simmons JM. A PHENOMENOLOGICAL MODEL FOR DYNAMIC RECRYSTALLIZATION. [Internet] [Masters thesis]. Mississippi State University; 2011. [cited 2020 Oct 25]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-04082011-165657/ ;.

Council of Science Editors:

Simmons JM. A PHENOMENOLOGICAL MODEL FOR DYNAMIC RECRYSTALLIZATION. [Masters Thesis]. Mississippi State University; 2011. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-04082011-165657/ ;

28. Trim, Michael Wesley. STRUCTURE PROPERTY RELATIONS AND FINITE ELEMENT ANALYSIS OF RAM HORNS: A PATHWAY TO ENERGY ABSORBENT BIO-INSPIRED DESIGNS.

Degree: PhD, Mechanical Engineering, 2011, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-07052011-161428/ ;

► A recently emerging engineering design approach entails studying the brilliant design solutions found in nature with an aim to develop design strategies that mimic… (more)

▼ A recently emerging engineering design approach entails studying the brilliant design solutions found in nature with an aim to develop design strategies that mimic the remarkable efficiency found in biological systems. This novel engineering approach is referred to as bio-inspired design. In this context, the present study quantifies the structure-property relations in bighorn sheep (Ovis canadensis) horn keratin, qualitatively characterizes the effects of a tapered spiral geometry (the same form as in a rams horn) on pressure wave and impulse mitigation, describes the stress attenuation capabilities and features of a rams head, and compares the structures and mechanical properties of some energy absorbent natural materials. The results and ideas presented herein can be used in the development of lightweight, energy absorbent, bio-inspired material designs. Among the most notable conclusions garnered from this research include: Horn keratin behaves in an anisotropic manner similar to a long fiber composite. Moisture content dominates the material behavior of horn keratin more than anisotropy, age, and stress-state. This makes moisture content the most influential parameter on the mechanical behavior of horn keratin. Tapered geometries mitigate the impulse generated by a stress wave due to the convergent boundary and a continually decreasing cross sectional area such that greater uniaxial stresses and subsequent axial deformation arises. Furthermore, the tapered geometry introduces small shear stresses that further decrease the impulse. Spiral geometries attenuate the impulse generated by a stress wave by the introduction of shear stresses along the length of the spiral. These shear stresses introduce transverse displacements that function to lessen the impulse. When both a taper and spiral geometry are used in a design, their synergistic effects multiplicatively reduce the impulse Tough natural materials have a high porosity, which makes them light-weight, while increasing their compressive energy absorption ability. Biomaterials whose functions include protection and energy absorption feature a multiscale, hierarchical, composite structure. The constituent materials are arranged in such ways to achieve a synergistic effect, where the properties of the composite exceed the properties of its constituents. Biological materials are therefore not confined to the law of mixtures. Advisors/Committee Members: Mark F. Horstemeyer (chair), Hongjoo Rhee (committee member), Lakiesha Williams (committee member), Jun Liao (committee member), Joanna McKittrick (committee member).

Subjects/Keywords: Energy Absorption; FEA; Bio-Inspired Design; Structure-Property Relations

…the Center for Advanced Vehicular Systems (CAVS) at Mississippi State University…

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APA (6^th Edition):

Trim, M. W. (2011). STRUCTURE PROPERTY RELATIONS AND FINITE ELEMENT ANALYSIS OF RAM HORNS: A PATHWAY TO ENERGY ABSORBENT BIO-INSPIRED DESIGNS. (Doctoral Dissertation). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-07052011-161428/ ;

Chicago Manual of Style (16^th Edition):

Trim, Michael Wesley. “STRUCTURE PROPERTY RELATIONS AND FINITE ELEMENT ANALYSIS OF RAM HORNS: A PATHWAY TO ENERGY ABSORBENT BIO-INSPIRED DESIGNS.” 2011. Doctoral Dissertation, Mississippi State University. Accessed October 25, 2020. http://sun.library.msstate.edu/ETD-db/theses/available/etd-07052011-161428/ ;.

MLA Handbook (7^th Edition):

Trim, Michael Wesley. “STRUCTURE PROPERTY RELATIONS AND FINITE ELEMENT ANALYSIS OF RAM HORNS: A PATHWAY TO ENERGY ABSORBENT BIO-INSPIRED DESIGNS.” 2011. Web. 25 Oct 2020.

Vancouver:

Trim MW. STRUCTURE PROPERTY RELATIONS AND FINITE ELEMENT ANALYSIS OF RAM HORNS: A PATHWAY TO ENERGY ABSORBENT BIO-INSPIRED DESIGNS. [Internet] [Doctoral dissertation]. Mississippi State University; 2011. [cited 2020 Oct 25]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-07052011-161428/ ;.

Council of Science Editors:

Trim MW. STRUCTURE PROPERTY RELATIONS AND FINITE ELEMENT ANALYSIS OF RAM HORNS: A PATHWAY TO ENERGY ABSORBENT BIO-INSPIRED DESIGNS. [Doctoral Dissertation]. Mississippi State University; 2011. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-07052011-161428/ ;

29. Brauer, Shane A. Internal state variable modeling and experiments of structure-property relationships of iron based alloys.

Degree: PhD, Mechanical Engineering, 2017, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-03022017-142755/ ;

► An investigation of the microstructure-mechanical property relationships for gray cast iron and a vintage ASTM A7 steel are presented herein. Gray cast iron was… (more)

Subjects/Keywords: torsion; tension; High strain rate; Gray cast iron; ASTM A7 steel; stress-state; dynamic strain aging; structure-property; negative strain rate sensitivity; stress-strain; internal state variables; plasticity; constitutive model; damage; compression

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APA (6^th Edition):

Brauer, S. A. (2017). Internal state variable modeling and experiments of structure-property relationships of iron based alloys. (Doctoral Dissertation). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-03022017-142755/ ;

Chicago Manual of Style (16^th Edition):

Brauer, Shane A. “Internal state variable modeling and experiments of structure-property relationships of iron based alloys.” 2017. Doctoral Dissertation, Mississippi State University. Accessed October 25, 2020. http://sun.library.msstate.edu/ETD-db/theses/available/etd-03022017-142755/ ;.

MLA Handbook (7^th Edition):

Brauer, Shane A. “Internal state variable modeling and experiments of structure-property relationships of iron based alloys.” 2017. Web. 25 Oct 2020.

Vancouver:

Brauer SA. Internal state variable modeling and experiments of structure-property relationships of iron based alloys. [Internet] [Doctoral dissertation]. Mississippi State University; 2017. [cited 2020 Oct 25]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-03022017-142755/ ;.

Council of Science Editors:

Brauer SA. Internal state variable modeling and experiments of structure-property relationships of iron based alloys. [Doctoral Dissertation]. Mississippi State University; 2017. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-03022017-142755/ ;

30. Nguyen, Vina Le. Structure-property relations of the exoskeleton of the ironclad beetle (Zopherus nodulosus haldemani).

Degree: MS, Agricultural and Biological Engineering, 2017, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10252017-125455/ ;

► In this study, structure-property relationships in the ironclad beetle (Zopherus nodulosus haldemani) exoskeleton are quantified to develop novel bio-inspired impact resistance technologies. The hierarchical… (more)

Subjects/Keywords: bio-inspired design; biomaterial; mechanical properties; microstructure; beetle exoskeleton; microstructure; mechanical properties; biomaterial; bio-inspired designbeetle exoskeleton

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APA (6^th Edition):

Nguyen, V. L. (2017). Structure-property relations of the exoskeleton of the ironclad beetle (Zopherus nodulosus haldemani). (Masters Thesis). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-10252017-125455/ ;

Chicago Manual of Style (16^th Edition):

Nguyen, Vina Le. “Structure-property relations of the exoskeleton of the ironclad beetle (Zopherus nodulosus haldemani).” 2017. Masters Thesis, Mississippi State University. Accessed October 25, 2020. http://sun.library.msstate.edu/ETD-db/theses/available/etd-10252017-125455/ ;.

MLA Handbook (7^th Edition):

Nguyen, Vina Le. “Structure-property relations of the exoskeleton of the ironclad beetle (Zopherus nodulosus haldemani).” 2017. Web. 25 Oct 2020.

Vancouver:

Nguyen VL. Structure-property relations of the exoskeleton of the ironclad beetle (Zopherus nodulosus haldemani). [Internet] [Masters thesis]. Mississippi State University; 2017. [cited 2020 Oct 25]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10252017-125455/ ;.

Council of Science Editors:

Nguyen VL. Structure-property relations of the exoskeleton of the ironclad beetle (Zopherus nodulosus haldemani). [Masters Thesis]. Mississippi State University; 2017. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10252017-125455/ ;

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