+publisher:"Mississippi State University" +contributor:("Youssef Hammi")

Mississippi State University

1. 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

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

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 April 20, 2021. 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. 20 Apr 2021.

Vancouver:

Holmer MS. Structural analysis and design of seals for coal mine safety. [Internet] [Masters thesis]. Mississippi State University; 2016. [cited 2021 Apr 20]. 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

2. 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

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

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 April 20, 2021. 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. 20 Apr 2021.

Vancouver:

Burcham MN. Multiscale structure-property relationships of ultra-high performance concrete. [Internet] [Masters thesis]. Mississippi State University; 2016. [cited 2021 Apr 20]. 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

3. 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

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

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 April 20, 2021. 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. 20 Apr 2021.

Vancouver:

Johnson KL. From horns to helmets: multi-objective design optimization considerations to protect the brain. [Internet] [Doctoral dissertation]. Mississippi State University; 2016. [cited 2021 Apr 20]. 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

4. 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

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

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 April 20, 2021. 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. 20 Apr 2021.

Vancouver:

Lawrimore WB. Multiscale modeling of multiphase polymers. [Internet] [Doctoral dissertation]. Mississippi State University; 2016. [cited 2021 Apr 20]. 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

5. Wheeler, Rachel Wood. Determination of interior vibration levels from tire/wheel assembly non-uniformities using a Monte Carlo process.

Degree: PhD, Mechanical Engineering, 2014, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-05022014-171428/ ;

► Variations in vehicle noise, vibration and harshness (NVH) response from one vehicle to the next can have significant impact on an automotive companys profile… (more)

▼ Variations in vehicle noise, vibration and harshness (NVH) response from one vehicle to the next can have significant impact on an automotive companys profile and profitability. The warranty claims due to excessive NVH response end up costing the manufacturers a large sum of money each year. In addition, the OEM will suffer a larger financial loss due to the poor perception of quality and customer dissatisfaction with their products due to the unacceptable NVH response. Therefore, measures must be taken to ensure less warranty claims and higher levels of customer satisfaction. This research focuses on aspects of design variations that are costly or difficult to be avoided in the design process such as variations with rubber parts and variations due to rotating components. Vibrations induced at the tire/wheel assembly due to variations in the radial and tangential forces and radial runout are responsible for the driver-felt vibrations that can lead to a large number of warranty claims. The purpose of this research is to improve the process of determining and analyzing vibration sources in the tire/wheel assembly in order to benefit the automotive manufacturer during the development and manufacturing phases. This research identifies the relationship between non-uniformity forces of the tire/wheel assemblies and the driver-felt vibrations during typical highway driving speeds. The contribution from each assembly location is analyzed and sensitivities are determined. A Monte Carlo process is used to predict numerous non-uniformity properties that are statistically representative of the assembly properties that can be expected at the manufacturing plant. The Monte Carlo produced non-uniformity properties are combined with the sensitivities to predict driver-felt vibrations that can be expected from vehicles leaving the manufacturing plant. This process provides the tools to determine an acceptable level of non-uniformities based on targets for interior vibration levels or determine if the vehicle sensitivities to non-uniformities need to be improved. Advisors/Committee Members: Youssef Hammi (chair), Mohamad Qatu (committee member), Clay Walden (committee member), Mark Horstemeyer (committee member).

Subjects/Keywords: tangential force variation; radial runout; sensitivity analysis; automotive vibration; radial force variation

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Wheeler, R. W. (2014). Determination of interior vibration levels from tire/wheel assembly non-uniformities using a Monte Carlo process. (Doctoral Dissertation). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-05022014-171428/ ;

Chicago Manual of Style (16^th Edition):

Wheeler, Rachel Wood. “Determination of interior vibration levels from tire/wheel assembly non-uniformities using a Monte Carlo process.” 2014. Doctoral Dissertation, Mississippi State University. Accessed April 20, 2021. http://sun.library.msstate.edu/ETD-db/theses/available/etd-05022014-171428/ ;.

MLA Handbook (7^th Edition):

Wheeler, Rachel Wood. “Determination of interior vibration levels from tire/wheel assembly non-uniformities using a Monte Carlo process.” 2014. Web. 20 Apr 2021.

Vancouver:

Wheeler RW. Determination of interior vibration levels from tire/wheel assembly non-uniformities using a Monte Carlo process. [Internet] [Doctoral dissertation]. Mississippi State University; 2014. [cited 2021 Apr 20]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-05022014-171428/ ;.

Council of Science Editors:

Wheeler RW. Determination of interior vibration levels from tire/wheel assembly non-uniformities using a Monte Carlo process. [Doctoral Dissertation]. Mississippi State University; 2014. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-05022014-171428/ ;

Mississippi State University

6. Handler, Evan Samuel. Characterization and possible thermal applications of additively-manufactured Inconel 718.

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

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-03232017-162309/ ;

► The aim of this work is to characterize the microstructural and mechanical behaviors of Additive Manufactured (AM) Inconel 718 and investigate the feasibility of… (more)

Subjects/Keywords: Inconel; 718; Additive Manufacturing; Metallurgy; LENS

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Handler, E. S. (2017). Characterization and possible thermal applications of additively-manufactured Inconel 718. (Masters Thesis). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-03232017-162309/ ;

Chicago Manual of Style (16^th Edition):

Handler, Evan Samuel. “Characterization and possible thermal applications of additively-manufactured Inconel 718.” 2017. Masters Thesis, Mississippi State University. Accessed April 20, 2021. http://sun.library.msstate.edu/ETD-db/theses/available/etd-03232017-162309/ ;.

MLA Handbook (7^th Edition):

Handler, Evan Samuel. “Characterization and possible thermal applications of additively-manufactured Inconel 718.” 2017. Web. 20 Apr 2021.

Vancouver:

Handler ES. Characterization and possible thermal applications of additively-manufactured Inconel 718. [Internet] [Masters thesis]. Mississippi State University; 2017. [cited 2021 Apr 20]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-03232017-162309/ ;.

Council of Science Editors:

Handler ES. Characterization and possible thermal applications of additively-manufactured Inconel 718. [Masters Thesis]. Mississippi State University; 2017. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-03232017-162309/ ;

7. 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…

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

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 April 20, 2021. 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. 20 Apr 2021.

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 2021 Apr 20]. 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

8. 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/ ;

► <i>In-situ </i>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

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

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 April 20, 2021. 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. 20 Apr 2021.

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 2021 Apr 20]. 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

9. 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

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

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 April 20, 2021. 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. 20 Apr 2021.

Vancouver:

Parkar AAH. ON MODELING AND EXPERIMENTAL VALIDATION OF EXTRUSION PROCESS OF LIGHTWEIGHT ALLOYS. [Internet] [Masters thesis]. Mississippi State University; 2011. [cited 2021 Apr 20]. 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

10. Junaid, Olalekan Rilwan. Experimental characterization of compaction and sintering of nanocrystalline copper steel powder.

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

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-06302016-003107/ ;

► The effect of ball milling on the compaction and sintering of nanocrystalline FC-0205 powder was studied in this work. As-received micron-sized FC-0205 powder was… (more)

Subjects/Keywords: compaction and sintering; nanocrystalline powder

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Junaid, O. R. (2016). Experimental characterization of compaction and sintering of nanocrystalline copper steel powder. (Masters Thesis). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-06302016-003107/ ;

Chicago Manual of Style (16^th Edition):

Junaid, Olalekan Rilwan. “Experimental characterization of compaction and sintering of nanocrystalline copper steel powder.” 2016. Masters Thesis, Mississippi State University. Accessed April 20, 2021. http://sun.library.msstate.edu/ETD-db/theses/available/etd-06302016-003107/ ;.

MLA Handbook (7^th Edition):

Junaid, Olalekan Rilwan. “Experimental characterization of compaction and sintering of nanocrystalline copper steel powder.” 2016. Web. 20 Apr 2021.

Vancouver:

Junaid OR. Experimental characterization of compaction and sintering of nanocrystalline copper steel powder. [Internet] [Masters thesis]. Mississippi State University; 2016. [cited 2021 Apr 20]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-06302016-003107/ ;.

Council of Science Editors:

Junaid OR. Experimental characterization of compaction and sintering of nanocrystalline copper steel powder. [Masters Thesis]. Mississippi State University; 2016. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-06302016-003107/ ;

Mississippi State University

11. 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

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

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 April 20, 2021. 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. 20 Apr 2021.

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 2021 Apr 20]. 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

12. Asadi, Ebrahim. STATIC AND FREE VIBRATION ANALYSES OF COMPOSITE SHELLS BASED ON DIFFERENT SHELL THEORIES.

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

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10312011-184344/ ;

► Equations of motion with required boundary conditions for doubly curved deep and thick composite shells are shown using two formulations. The first is based… (more)

▼ Equations of motion with required boundary conditions for doubly curved deep and thick composite shells are shown using two formulations. The first is based upon the formulation that was presented initially by Rath and Das (1973, J. Sound and Vib.) and followed by Reddy (1984, J. Engng. Mech. ASCE). In this formulation, plate stiffness parameters are used for thick shells, which reduced the equations to those applicable for shallow shells. This formulation is widely used but its accuracy has not been completely tested. The second formulation is based upon that of Qatu (1995, Compos. Press. Vessl. Indust.; 1999, Int. J. Solids Struct.). In this formulation, the stiffness parameters are calculated by using exact integration of the stress resultant equations. In addition, Qatu considered the radius of twist in his formulation. In both formulations, first order polynomials for in-plane displacements in the z-direction are utilized allowing for the inclusion of shear deformation and rotary inertia effects (first order shear deformation theory or FSDT). Also, FSDTQ has been modified in this dissertation using the radii of each laminate instead of using the radii of mid-plane in the moment of inertias and stress resultants equations. Exact static and free vibration solutions for isotropic and symmetric and anti-symmetric cross-ply cylindrical shells for different length-to-thickness and length-to-radius ratios are obtained using the above theories. Finally, the equations of motion are put together with the equations of stress resultants to arrive at a system of seventeen first-order differential equations. These equations are solved numerically with the aid of General Differential Quadrature (GDQ) method for isotropic, cross-ply, angle-ply and general lay-up cylindrical shells with different boundary conditions using the above mentioned theories. Results obtained using all three theories (FSDT, FSDTQ and modified FSDTQ) are compared with the results available in literature and those obtained using a three-dimensional (3D) analysis. The latter (3D) is used here mainly to test the accuracy of the shell theories presented here. Advisors/Committee Members: Mohammad S. Qatu (chair), Haitham El Kadiri (chair), Rani W. Sullivan (committee member), Oliver J. Myers (committee member), Youssef Hammi (committee member).

Subjects/Keywords: Composite; Shells; Shear deformation; Deep; GDQ

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Asadi, E. (2011). STATIC AND FREE VIBRATION ANALYSES OF COMPOSITE SHELLS BASED ON DIFFERENT SHELL THEORIES. (Doctoral Dissertation). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-10312011-184344/ ;

Chicago Manual of Style (16^th Edition):

Asadi, Ebrahim. “STATIC AND FREE VIBRATION ANALYSES OF COMPOSITE SHELLS BASED ON DIFFERENT SHELL THEORIES.” 2011. Doctoral Dissertation, Mississippi State University. Accessed April 20, 2021. http://sun.library.msstate.edu/ETD-db/theses/available/etd-10312011-184344/ ;.

MLA Handbook (7^th Edition):

Asadi, Ebrahim. “STATIC AND FREE VIBRATION ANALYSES OF COMPOSITE SHELLS BASED ON DIFFERENT SHELL THEORIES.” 2011. Web. 20 Apr 2021.

Vancouver:

Asadi E. STATIC AND FREE VIBRATION ANALYSES OF COMPOSITE SHELLS BASED ON DIFFERENT SHELL THEORIES. [Internet] [Doctoral dissertation]. Mississippi State University; 2011. [cited 2021 Apr 20]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10312011-184344/ ;.

Council of Science Editors:

Asadi E. STATIC AND FREE VIBRATION ANALYSES OF COMPOSITE SHELLS BASED ON DIFFERENT SHELL THEORIES. [Doctoral Dissertation]. Mississippi State University; 2011. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10312011-184344/ ;

13. Bratton, Nicholas Robert. THE ROLE OF TWINNING IN THE INITIATION OF FRACTURE IN AM30 AND AZ61 MAGNESIUM ALLOYS.

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

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-04052012-150617/ ;

► Magnesium alloys are excellent material candidate to reduce mass of automotive structures, and as such to meet the Department of Energy's targets in fuel… (more)

Subjects/Keywords: twin-twin hardeniing; twin propagation; twin nucleation; magnesium; interupted EBSD

10 more images…

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Bratton, N. R. (2012). THE ROLE OF TWINNING IN THE INITIATION OF FRACTURE IN AM30 AND AZ61 MAGNESIUM ALLOYS. (Masters Thesis). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-04052012-150617/ ;

Chicago Manual of Style (16^th Edition):

Bratton, Nicholas Robert. “THE ROLE OF TWINNING IN THE INITIATION OF FRACTURE IN AM30 AND AZ61 MAGNESIUM ALLOYS.” 2012. Masters Thesis, Mississippi State University. Accessed April 20, 2021. http://sun.library.msstate.edu/ETD-db/theses/available/etd-04052012-150617/ ;.

MLA Handbook (7^th Edition):

Bratton, Nicholas Robert. “THE ROLE OF TWINNING IN THE INITIATION OF FRACTURE IN AM30 AND AZ61 MAGNESIUM ALLOYS.” 2012. Web. 20 Apr 2021.

Vancouver:

Bratton NR. THE ROLE OF TWINNING IN THE INITIATION OF FRACTURE IN AM30 AND AZ61 MAGNESIUM ALLOYS. [Internet] [Masters thesis]. Mississippi State University; 2012. [cited 2021 Apr 20]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-04052012-150617/ ;.

Council of Science Editors:

Bratton NR. THE ROLE OF TWINNING IN THE INITIATION OF FRACTURE IN AM30 AND AZ61 MAGNESIUM ALLOYS. [Masters Thesis]. Mississippi State University; 2012. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-04052012-150617/ ;

14. Yenusah, Caleb Onuh. Finite element study on the influence of bone-implant interface condition on femoral fracture after cementless total hip replacement.

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

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10252017-105732/ ;

► Finite element analysis was performed on an implanted femur, using loads of daily living activities, performed by total hip replacement patients. A probabilistic bone… (more)

Subjects/Keywords: non-cemented; FEA; probability of fatigue fracture; stress

10 more images…

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Yenusah, C. O. (2017). Finite element study on the influence of bone-implant interface condition on femoral fracture after cementless total hip replacement. (Masters Thesis). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-10252017-105732/ ;

Chicago Manual of Style (16^th Edition):

Yenusah, Caleb Onuh. “Finite element study on the influence of bone-implant interface condition on femoral fracture after cementless total hip replacement.” 2017. Masters Thesis, Mississippi State University. Accessed April 20, 2021. http://sun.library.msstate.edu/ETD-db/theses/available/etd-10252017-105732/ ;.

MLA Handbook (7^th Edition):

Yenusah, Caleb Onuh. “Finite element study on the influence of bone-implant interface condition on femoral fracture after cementless total hip replacement.” 2017. Web. 20 Apr 2021.

Vancouver:

Yenusah CO. Finite element study on the influence of bone-implant interface condition on femoral fracture after cementless total hip replacement. [Internet] [Masters thesis]. Mississippi State University; 2017. [cited 2021 Apr 20]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10252017-105732/ ;.

Council of Science Editors:

Yenusah CO. Finite element study on the influence of bone-implant interface condition on femoral fracture after cementless total hip replacement. [Masters Thesis]. Mississippi State University; 2017. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10252017-105732/ ;

15. Dou, Yangqing. Computational investigation and parametric study of lateral impact behavior of pressurized pipelines.

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

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-03222016-002513/ ;

► This thesis presents a computational study to examine lateral impact behavior of pressurized pipelines and to determine influence of internal pressure on the impact… (more)

Subjects/Keywords: Quartic polynomial functions; Pressurized pipelines; LS-DYNA

11 more images…

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Dou, Y. (2016). Computational investigation and parametric study of lateral impact behavior of pressurized pipelines. (Masters Thesis). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-03222016-002513/ ;

Chicago Manual of Style (16^th Edition):

Dou, Yangqing. “Computational investigation and parametric study of lateral impact behavior of pressurized pipelines.” 2016. Masters Thesis, Mississippi State University. Accessed April 20, 2021. http://sun.library.msstate.edu/ETD-db/theses/available/etd-03222016-002513/ ;.

MLA Handbook (7^th Edition):

Dou, Yangqing. “Computational investigation and parametric study of lateral impact behavior of pressurized pipelines.” 2016. Web. 20 Apr 2021.

Vancouver:

Dou Y. Computational investigation and parametric study of lateral impact behavior of pressurized pipelines. [Internet] [Masters thesis]. Mississippi State University; 2016. [cited 2021 Apr 20]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-03222016-002513/ ;.

Council of Science Editors:

Dou Y. Computational investigation and parametric study of lateral impact behavior of pressurized pipelines. [Masters Thesis]. Mississippi State University; 2016. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-03222016-002513/ ;

16. Hughes, Justin Matthew. The application of uncertainty quantification (UQ) and sensitivity analysis (SA) methodologies to engineering models and mechanical experiments.

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

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10242016-124832/ ;

► Understanding the effects of uncertainty on modeling has seen an increased focus as engineering disciplines rely more heavily on computational modeling of complex physical… (more)

▼ Understanding the effects of uncertainty on modeling has seen an increased focus as engineering disciplines rely more heavily on computational modeling of complex physical processes to predict system performance and make informed engineering decisions. These computational methods often use simplified models and assumptions with models calibrated using uncertain, averaged experimental data. This commonplace method ignores the effects of uncertainty on the variation of modeling output. Qualitatively, uncertainty is the possibility of error existing from experiment to experiment, from model to model, or from experiment to model. Quantitatively, uncertainty quantification (UQ) methodologies seek to determine the how variable an engineering system is when subjected to variation in the factors that control it. Often performed in conjunction, sensitivity analysis (SA) methods seek to describe what model factor contributes the most to variation in model output. UQ and SA methodologies were employed in the analysis of the Modified Embedded Atom Method (MEAM) model for a pure aluminum, a microstructure sensitive fatigue crack growth model for polycarbonate, and the MultiStage Fatigue (MSF) model for AZ31 magnesium alloy. For the MEAM model, local uncertainty and sensitivity measures were investigated for the purpose of improving model calibrations. In polycarbonate fatigue crack growth, a Monte Carlo method is implemented in code and employed to investigate how variations in model input factors effect fatigue crack growth predictions. Lastly, in the analysis of fatigue life predictions with the MSF model for AZ31, the expected fatigue performance range due to variation in experimental parameters is investigated using both Monte Carlo Simple Random Sampling (MCSRS) methods and the estimation of first order effects indices using the Fourier Amplitude Sensitivity Test (FAST) method. Advisors/Committee Members: Youssef Hammi (committee member), Rajkumar Prabhu (committee member), Hongjoo Rhee (committee member), Mark Horstemeyer (chair).

Subjects/Keywords: Fourier Amplitude Sensitivity Test; Calibration; Sensitivity; Uncertainty; Modified Embedded Atom Method; MultiStage Fatigue

13 more images…

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Hughes, J. M. (2016). The application of uncertainty quantification (UQ) and sensitivity analysis (SA) methodologies to engineering models and mechanical experiments. (Doctoral Dissertation). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-10242016-124832/ ;

Chicago Manual of Style (16^th Edition):

Hughes, Justin Matthew. “The application of uncertainty quantification (UQ) and sensitivity analysis (SA) methodologies to engineering models and mechanical experiments.” 2016. Doctoral Dissertation, Mississippi State University. Accessed April 20, 2021. http://sun.library.msstate.edu/ETD-db/theses/available/etd-10242016-124832/ ;.

MLA Handbook (7^th Edition):

Hughes, Justin Matthew. “The application of uncertainty quantification (UQ) and sensitivity analysis (SA) methodologies to engineering models and mechanical experiments.” 2016. Web. 20 Apr 2021.

Vancouver:

Hughes JM. The application of uncertainty quantification (UQ) and sensitivity analysis (SA) methodologies to engineering models and mechanical experiments. [Internet] [Doctoral dissertation]. Mississippi State University; 2016. [cited 2021 Apr 20]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10242016-124832/ ;.

Council of Science Editors:

Hughes JM. The application of uncertainty quantification (UQ) and sensitivity analysis (SA) methodologies to engineering models and mechanical experiments. [Doctoral Dissertation]. Mississippi State University; 2016. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10242016-124832/ ;

17. Templin, Brandon Chandler. Towards modeling the anisotropic behavior of polycrystalline materials due to texture using a second order structure tensor.

Degree: PhD, Mechanical Engineering, 2014, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-07022014-113740/ ;

► A material model capable of reproducing the anisotropic behavior of polycrystalline materials will prove to be useful in simulations in which directional properties are… (more)

Subjects/Keywords: polycrystalline; texture; orientation distribution function; structure tensor; anisotropy; EMMI

4 more images…

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Templin, B. C. (2014). Towards modeling the anisotropic behavior of polycrystalline materials due to texture using a second order structure tensor. (Doctoral Dissertation). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-07022014-113740/ ;

Chicago Manual of Style (16^th Edition):

Templin, Brandon Chandler. “Towards modeling the anisotropic behavior of polycrystalline materials due to texture using a second order structure tensor.” 2014. Doctoral Dissertation, Mississippi State University. Accessed April 20, 2021. http://sun.library.msstate.edu/ETD-db/theses/available/etd-07022014-113740/ ;.

MLA Handbook (7^th Edition):

Templin, Brandon Chandler. “Towards modeling the anisotropic behavior of polycrystalline materials due to texture using a second order structure tensor.” 2014. Web. 20 Apr 2021.

Vancouver:

Templin BC. Towards modeling the anisotropic behavior of polycrystalline materials due to texture using a second order structure tensor. [Internet] [Doctoral dissertation]. Mississippi State University; 2014. [cited 2021 Apr 20]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-07022014-113740/ ;.

Council of Science Editors:

Templin BC. Towards modeling the anisotropic behavior of polycrystalline materials due to texture using a second order structure tensor. [Doctoral Dissertation]. Mississippi State University; 2014. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-07022014-113740/ ;

18. Tjiptowidjojo, Yustianto. On a ductile void growth model with evolving microstructure model for inelasticity.

Degree: PhD, Mechanical Engineering, 2014, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10292014-163444/ ;

► The objective of this work is to develop an evolution equation for the ductile growth of a spherical void in a highly strain rate… (more)

Subjects/Keywords: return mapping algorithm; finite element analysis; finite strain; plasticity; internal state variable; damage; void growth

10 more images…

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Tjiptowidjojo, Y. (2014). On a ductile void growth model with evolving microstructure model for inelasticity. (Doctoral Dissertation). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-10292014-163444/ ;

Chicago Manual of Style (16^th Edition):

Tjiptowidjojo, Yustianto. “On a ductile void growth model with evolving microstructure model for inelasticity.” 2014. Doctoral Dissertation, Mississippi State University. Accessed April 20, 2021. http://sun.library.msstate.edu/ETD-db/theses/available/etd-10292014-163444/ ;.

MLA Handbook (7^th Edition):

Tjiptowidjojo, Yustianto. “On a ductile void growth model with evolving microstructure model for inelasticity.” 2014. Web. 20 Apr 2021.

Vancouver:

Tjiptowidjojo Y. On a ductile void growth model with evolving microstructure model for inelasticity. [Internet] [Doctoral dissertation]. Mississippi State University; 2014. [cited 2021 Apr 20]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10292014-163444/ ;.

Council of Science Editors:

Tjiptowidjojo Y. On a ductile void growth model with evolving microstructure model for inelasticity. [Doctoral Dissertation]. Mississippi State University; 2014. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-10292014-163444/ ;

19. Ahad, Fazle R. Modified internal state variable models of plasticity using nonlocal integrals in damage and gradients in dislocation density.

Degree: PhD, Mechanical Engineering, 2014, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-11272013-120725/ ;

► To enhance material performance at different length scales, this study strives to develop a reliable analytical and computational tool with the help of internal… (more)

▼ To enhance material performance at different length scales, this study strives to develop a reliable analytical and computational tool with the help of internal state variables spanning micro and macro-level behaviors. First, the practical relevance of a nonlocal damage integral added to an internal state variable (BCJ) model is studied to alleviate numerical instabilities associated within the post-bifurcation regime. The characteristic length scale in the nonlocal damage, which is mathematical in nature, can be calibrated using a series of notch tensile tests. Then the same length scale from the notch tests is used in solving the problem of a high-velocity (between 89 and 107 m/s) rigid projectile colliding against a 6061-T6 aluminum-disk. The investigation indicates that incorporating a characteristic length scale to the constitutive model eliminates the pathological mesh-dependency associated with material instabilities. In addition, the numerical calculations agree well with experimental data. Next, an effort is made rather to introduce a physically motivated length scale than to apply a mathematical-one in the deformation analysis. Along this line, a dislocation based plasticity model is developed where an intrinsic length scale is introduced in the forms of spatial gradients of mobile and immobile dislocation densities. The spatial gradients are naturally invoked from balance laws within a consistent kinematic and thermodynamic framework. An analytical solution of the model variables is derived at homogenous steady state using the linear stability and bifurcation analysis. The model qualitatively captures the formation of dislocation cell-structures through material instabilities at the microscopic level. Finally, the model satisfactorily predicts macroscopic mechanical behaviors - e.g., multi-strain rate uniaxial compression, simple shear, and stress relaxation - and validates experimental results. Advisors/Committee Members: Mark F. Horstemeyer (committee member), Youssef Hammi (committee member), Jakob B. Ostien (committee member), Douglas J. Bammann (chair).

Subjects/Keywords: internal state variable; dislocation pattern formation; dislocation cell structure; mobile dislocation; immobile dislocation; high velocity impact; nonlocal damage

10 more images…

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Ahad, F. R. (2014). Modified internal state variable models of plasticity using nonlocal integrals in damage and gradients in dislocation density. (Doctoral Dissertation). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-11272013-120725/ ;

Chicago Manual of Style (16^th Edition):

Ahad, Fazle R. “Modified internal state variable models of plasticity using nonlocal integrals in damage and gradients in dislocation density.” 2014. Doctoral Dissertation, Mississippi State University. Accessed April 20, 2021. http://sun.library.msstate.edu/ETD-db/theses/available/etd-11272013-120725/ ;.

MLA Handbook (7^th Edition):

Ahad, Fazle R. “Modified internal state variable models of plasticity using nonlocal integrals in damage and gradients in dislocation density.” 2014. Web. 20 Apr 2021.

Vancouver:

Ahad FR. Modified internal state variable models of plasticity using nonlocal integrals in damage and gradients in dislocation density. [Internet] [Doctoral dissertation]. Mississippi State University; 2014. [cited 2021 Apr 20]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-11272013-120725/ ;.

Council of Science Editors:

Ahad FR. Modified internal state variable models of plasticity using nonlocal integrals in damage and gradients in dislocation density. [Doctoral Dissertation]. Mississippi State University; 2014. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-11272013-120725/ ;

20. Bryan, Katie Elizabeth. Multiscale modeling of cementitious materials.

Degree: MS, Mechanical Engineering, 2019, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-03062019-161552/ ;

► Cementitious material is modeled at multiple length scales to provide an understanding of its structure-property relations at the mesoscale. The ultimate research goal is… (more)

Subjects/Keywords: Ultra-High Performance Concrete; Fiber Reinforced; Mechanical Property; Finite Element Analysis; Microstructural

10 more images…

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Bryan, K. E. (2019). Multiscale modeling of cementitious materials. (Masters Thesis). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-03062019-161552/ ;

Chicago Manual of Style (16^th Edition):

Bryan, Katie Elizabeth. “Multiscale modeling of cementitious materials.” 2019. Masters Thesis, Mississippi State University. Accessed April 20, 2021. http://sun.library.msstate.edu/ETD-db/theses/available/etd-03062019-161552/ ;.

MLA Handbook (7^th Edition):

Bryan, Katie Elizabeth. “Multiscale modeling of cementitious materials.” 2019. Web. 20 Apr 2021.

Vancouver:

Bryan KE. Multiscale modeling of cementitious materials. [Internet] [Masters thesis]. Mississippi State University; 2019. [cited 2021 Apr 20]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-03062019-161552/ ;.

Council of Science Editors:

Bryan KE. Multiscale modeling of cementitious materials. [Masters Thesis]. Mississippi State University; 2019. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-03062019-161552/ ;

21. Wang, Wenchao. THREE DIMENSIONAL ELASTICITY ANALYSES FOR ISOTROPIC AND ORTHOTROPIC COMPOSITE CYLINDERS.

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

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-04042012-172859/ ;

► The demand for using shell theories comes from its efficiency in computational and analytical cost. On another side, new materials that are orthotropic and/or… (more)

Subjects/Keywords: vibration; cylinders; shell elements; FEA accuracy; ODE system; composite; 3D elasticity

10 more images…

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Wang, W. (2012). THREE DIMENSIONAL ELASTICITY ANALYSES FOR ISOTROPIC AND ORTHOTROPIC COMPOSITE CYLINDERS. (Doctoral Dissertation). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-04042012-172859/ ;

Chicago Manual of Style (16^th Edition):

Wang, Wenchao. “THREE DIMENSIONAL ELASTICITY ANALYSES FOR ISOTROPIC AND ORTHOTROPIC COMPOSITE CYLINDERS.” 2012. Doctoral Dissertation, Mississippi State University. Accessed April 20, 2021. http://sun.library.msstate.edu/ETD-db/theses/available/etd-04042012-172859/ ;.

MLA Handbook (7^th Edition):

Wang, Wenchao. “THREE DIMENSIONAL ELASTICITY ANALYSES FOR ISOTROPIC AND ORTHOTROPIC COMPOSITE CYLINDERS.” 2012. Web. 20 Apr 2021.

Vancouver:

Wang W. THREE DIMENSIONAL ELASTICITY ANALYSES FOR ISOTROPIC AND ORTHOTROPIC COMPOSITE CYLINDERS. [Internet] [Doctoral dissertation]. Mississippi State University; 2012. [cited 2021 Apr 20]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-04042012-172859/ ;.

Council of Science Editors:

Wang W. THREE DIMENSIONAL ELASTICITY ANALYSES FOR ISOTROPIC AND ORTHOTROPIC COMPOSITE CYLINDERS. [Doctoral Dissertation]. Mississippi State University; 2012. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-04042012-172859/ ;

22. Florea, Radu Stefanel. Experiments and simulation for 6061-T6 aluminum alloy resistance spot welded lap joints.

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

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-08242012-162010/ ;

► This comprehensive study is the first to quantify the fatigue performance, failure loads, and microstructure of resistance spot welding (RSW) in 6061-T6 aluminum (Al)… (more)

▼ This comprehensive study is the first to quantify the fatigue performance, failure loads, and microstructure of resistance spot welding (RSW) in 6061-T6 aluminum (Al) alloy according to welding parameters and process sensitivity. The extensive experimental, theoretical and simulated analyses will provide a framework to optimize the welding of lightweight structures for more fuel-efficient automotive and military applications. The research was executed in four primary components. The first section involved using electron back scatter diffraction (EBSD) scanning, tensile testing, laser beam profilometry (LBP) measurements, and optical microscopy(OM) images to experimentally investigate failure loads and deformation of the Al-alloy resistance spot welded joints. Three welding conditions, as well as nugget and microstructure characteristics, were quantified according to predefined process parameters. Quasi-static tensile tests were used to characterize the failure loads in specimens based upon these same process parameters. Profilometer results showed that increasing the applied welding current deepened the weld imprints. The EBSD scans revealed the strong dependency between the grain sizes and orientation function on the process parameters. For the second section, the fatigue behavior of the RSWed joints was experimentally investigated. The process optimization included consideration of the forces, currents, and times for both the main weld and post-heating. Load control cyclic tests were conducted on single weld lap-shear joint coupons to characterize the fatigue behavior in spot welded specimens. Results demonstrate that welding parameters do indeed significantly affect the microstructure and fatigue performance for these welds. The third section comprised residual strains of resistance spot welded joints measured in three different directions, denoted as in-plane longitudinal, in-plane transversal, and normal, and captured on the fusion zone, heat affected zone and base metal of the joints. Neutron diffraction results showed residual stresses in the weld are approximately 40% lower than the yield strength of the parent material, with maximum variation occurring in the vertical position of the specimen because of the orientation of electrode clamping forces that produce a non-uniform solidification pattern. In the final section a theoretical continuum modeling framework for 6061-T6 aluminum resistance spot welded joints is presented. Advisors/Committee Members: Mark F. Horstemeyer (committee member), Douglas J. Bammann (chair), Steve R. Daniewicz (committee member), Youssef Hammi (committee member), Kiran N. Solanki (committee member).

Subjects/Keywords: welding; aluminum; failure loads; fatigue; laser beam profilometry; residual stresses; neutron diffraction

10 more images…

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Florea, R. S. (2012). Experiments and simulation for 6061-T6 aluminum alloy resistance spot welded lap joints. (Doctoral Dissertation). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-08242012-162010/ ;

Chicago Manual of Style (16^th Edition):

Florea, Radu Stefanel. “Experiments and simulation for 6061-T6 aluminum alloy resistance spot welded lap joints.” 2012. Doctoral Dissertation, Mississippi State University. Accessed April 20, 2021. http://sun.library.msstate.edu/ETD-db/theses/available/etd-08242012-162010/ ;.

MLA Handbook (7^th Edition):

Florea, Radu Stefanel. “Experiments and simulation for 6061-T6 aluminum alloy resistance spot welded lap joints.” 2012. Web. 20 Apr 2021.

Vancouver:

Florea RS. Experiments and simulation for 6061-T6 aluminum alloy resistance spot welded lap joints. [Internet] [Doctoral dissertation]. Mississippi State University; 2012. [cited 2021 Apr 20]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-08242012-162010/ ;.

Council of Science Editors:

Florea RS. Experiments and simulation for 6061-T6 aluminum alloy resistance spot welded lap joints. [Doctoral Dissertation]. Mississippi State University; 2012. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-08242012-162010/ ;

23. Song, Weiwei. Development of a multiscale internal state variable inelasticity-corrosion damage model for magnesium alloys.

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

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-06302015-163806/ ;

► This dissertation proposes a multiscale Internal State Variable (ISV) inelasticity-corrosion damage model that is motivated by experimental microstructure-property relations of magnesium alloys. The corrosion… (more)

Subjects/Keywords: Magnesium Alloys; Corrosion Fatigue; Modelling; Corrosion; Internal State Variable

…Department, Mississippi State University), Dr. Xiaodong Su, Dr. I-Wei Chu (Institute for… …support from the Center for Advanced Vehicular Systems at Mississippi State University is… …provided by Mississippi State University to determine the number of pits, the nearest neighbour…

14 more images…

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Song, W. (2015). Development of a multiscale internal state variable inelasticity-corrosion damage model for magnesium alloys. (Doctoral Dissertation). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-06302015-163806/ ;

Chicago Manual of Style (16^th Edition):

Song, Weiwei. “Development of a multiscale internal state variable inelasticity-corrosion damage model for magnesium alloys.” 2015. Doctoral Dissertation, Mississippi State University. Accessed April 20, 2021. http://sun.library.msstate.edu/ETD-db/theses/available/etd-06302015-163806/ ;.

MLA Handbook (7^th Edition):

Song, Weiwei. “Development of a multiscale internal state variable inelasticity-corrosion damage model for magnesium alloys.” 2015. Web. 20 Apr 2021.

Vancouver:

Song W. Development of a multiscale internal state variable inelasticity-corrosion damage model for magnesium alloys. [Internet] [Doctoral dissertation]. Mississippi State University; 2015. [cited 2021 Apr 20]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-06302015-163806/ ;.

Council of Science Editors:

Song W. Development of a multiscale internal state variable inelasticity-corrosion damage model for magnesium alloys. [Doctoral Dissertation]. Mississippi State University; 2015. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-06302015-163806/ ;

24. Al-Shubailat, Omar. Minimization of noise and vibration related to driveline imbalance using robust design processes.

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

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-06082013-193551/ ;

► Variation in vehicle noise, vibration and harshness (NVH) response can be caused by variability in design (e.g. tolerance), material, manufacturing, or other sources of… (more)

Subjects/Keywords: program.; Java; quality engineering; quality; capability studies; manufacturing processes; manufacturing engineer; design engineer; sales; profit; customer concern; warranty; objectionable; Eigen functions; vectors; Eigen; Eigen values; identity; Euler; differential equations; differential; transfer case; shaft; driveline; static imbalance; dynamic imbalance; passenger; customer; driver inboard ear; driver outboard ear; steering wheel; seat track; variation; Gamma distribution; normal distribution; standard deviation; average; variance; mean; phasor; victor; scalar; linear system; LTI; linear time invariant; transfer function; output; input; microphone; accelerometers; tachometer; channels; order; frequency; frequency domain; time domain; convolution; Transformation; Fourier Transformer; Fourier; imaginary and real; logarithmic; decibel; sensitivity curves; run down; run up; two wheel drive; Four Wheel Drive; Nissan; Truck; OEM; Original Equipment Manufacturers; Data Acquisitions; Channels; Simulation; Six Sigma; variability; Design; Robust; sensitivity; Vibration; Imbalance; Noise; Harshness; NVH; Driveline

10 more images…

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Al-Shubailat, O. (2013). Minimization of noise and vibration related to driveline imbalance using robust design processes. (Doctoral Dissertation). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-06082013-193551/ ;

Chicago Manual of Style (16^th Edition):

Al-Shubailat, Omar. “Minimization of noise and vibration related to driveline imbalance using robust design processes.” 2013. Doctoral Dissertation, Mississippi State University. Accessed April 20, 2021. http://sun.library.msstate.edu/ETD-db/theses/available/etd-06082013-193551/ ;.

MLA Handbook (7^th Edition):

Al-Shubailat, Omar. “Minimization of noise and vibration related to driveline imbalance using robust design processes.” 2013. Web. 20 Apr 2021.

Vancouver:

Al-Shubailat O. Minimization of noise and vibration related to driveline imbalance using robust design processes. [Internet] [Doctoral dissertation]. Mississippi State University; 2013. [cited 2021 Apr 20]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-06082013-193551/ ;.

Council of Science Editors:

Al-Shubailat O. Minimization of noise and vibration related to driveline imbalance using robust design processes. [Doctoral Dissertation]. Mississippi State University; 2013. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-06082013-193551/ ;

25. Adedoyin, Adetokunbo Adelana. A continuum mechanics approach to modeling and simulating engineering materials undergoing phase transformation using the Evolving Micro-Structural Model of Inelasticity.

Degree: PhD, Computational Engineering, 2014, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-01272014-130116/ ;

► Heat treatment for the purpose of material strengthening is accompanied by residual stresses and distortion. During these processing steps, steel alloys experience a phase… (more)

▼ Heat treatment for the purpose of material strengthening is accompanied by residual stresses and distortion. During these processing steps, steel alloys experience a phase change that in turn modify their overall mechanical response. To properly account for the cumulative composite behavior, the mechanical response, transformation kinetics and subsequent interaction of each phase have to be properly accounted for. Of interest to material designers and fabricators is modeling and simulating the evolutionary process a part undergoes for the sake of capturing the observable residual stress states and geometric distortion accumulated after processing. In an attempt to capture the aforementioned physical phenomena, this investigation is premised upon a consistent thermodynamic framework. Following this, the single phase Evolving Microstructural Model of Inelasticity state variable model is extended to accommodate the occurrence of multiphases, affirming that the interaction between coexisting phases is through an interfacial stress. Since the efficacy of a multiphase model is dependent on its ability to capture the behavior of constituents phases and their subsequent interaction, we introduce a physically based self-consistent strain partitioning algorithm. With synthesis of the aforementioned ideas, the additional transformation induced plasticity is numerically accounted for by modifying each phases flowrule to accommodate an interfacial stress. In addition, for simulating the cohabitation of two phases, the mechanical multiphase model equations is coupled with a previously developed non-diffusional phase transformation kinetics model. A qualitative assessment of the material response based on a Taylor, Sachs and self-consistent polycrystalline approximation is carried out. Further analysis of the multiphase model and its interaction with transformation kinetics is evaluated. Advisors/Committee Members: Douglas J. Bammann (chair), Youssef Hammi (chair), Thomas E. Lacy Jr. (committee member), Seongjai Kim (committee member), Edward A. Luke (committee member).

Subjects/Keywords: Polycrystalline Approximation; Rate Kinetics; Multiphase; Phase Transformation; Plasticity

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Adedoyin, A. A. (2014). A continuum mechanics approach to modeling and simulating engineering materials undergoing phase transformation using the Evolving Micro-Structural Model of Inelasticity. (Doctoral Dissertation). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-01272014-130116/ ;

Chicago Manual of Style (16^th Edition):

Adedoyin, Adetokunbo Adelana. “A continuum mechanics approach to modeling and simulating engineering materials undergoing phase transformation using the Evolving Micro-Structural Model of Inelasticity.” 2014. Doctoral Dissertation, Mississippi State University. Accessed April 20, 2021. http://sun.library.msstate.edu/ETD-db/theses/available/etd-01272014-130116/ ;.

MLA Handbook (7^th Edition):

Adedoyin, Adetokunbo Adelana. “A continuum mechanics approach to modeling and simulating engineering materials undergoing phase transformation using the Evolving Micro-Structural Model of Inelasticity.” 2014. Web. 20 Apr 2021.

Vancouver:

Adedoyin AA. A continuum mechanics approach to modeling and simulating engineering materials undergoing phase transformation using the Evolving Micro-Structural Model of Inelasticity. [Internet] [Doctoral dissertation]. Mississippi State University; 2014. [cited 2021 Apr 20]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-01272014-130116/ ;.

Council of Science Editors:

Adedoyin AA. A continuum mechanics approach to modeling and simulating engineering materials undergoing phase transformation using the Evolving Micro-Structural Model of Inelasticity. [Doctoral Dissertation]. Mississippi State University; 2014. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-01272014-130116/ ;

26. Khalili, Ashkan. Spectrally formulated user-defined element in Abaqus for wave motion analysis and health monitoring of composite structures.

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

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-03222017-100343/ ;

► Wave propagation analysis in 1-D and 2-D composite structures is performed efficiently and accurately through the formulation of a User-Defined Element (UEL) based on… (more)

▼ Wave propagation analysis in 1-D and 2-D composite structures is performed efficiently and accurately through the formulation of a User-Defined Element (UEL) based on the wavelet spectral finite element (WSFE) method. The WSFE method is based on the first order shear deformation theory which yields accurate results for wave motion at high frequencies. The wave equations are reduced to ordinary differential equations using Daubechies compactly supported, orthonormal, wavelet scaling functions for approximations in time and one spatial dimension. The 1-D and 2-D WSFE models are highly efficient computationally and provide a direct relationship between system input and output in the frequency domain. The UEL is formulated and implemented in Abaqus for wave propagation analysis in composite structures with complexities. Frequency domain formulation of WSFE leads to complex valued parameters, which are decoupled into real and imaginary parts and presented to Abaqus as real values. The final solution is obtained by forming a complex value using the real number solutions given by Abaqus. Several numerical examples are presented here for 1-D and 2-D composite waveguides. Wave motions predicted by the developed UEL correlate very well with Abaqus simulations using shear flexible elements. The results also show that the UEL largely retains computational efficiency of the WSFE method and extends its ability to model complex features. An enhanced cross-correlation method (ECCM) is developed in order to accurately predict damage location in plates. Three major modifications are proposed to the widely used cross-correlation method (CCM) to improve damage localization capabilities, namely actuator-sensor configuration, signal pre-processing method, and signal post-processing method. The ECCM is investigated numerically (FEM simulation) and experimentally. Experimental investigations for damage detection employ a PZT transducer as actuator and laser Doppler vibrometer as sensor. Both numerical and experimental results show that the developed method is capable of damage localization with high precision. Further, ECCM is used to detect and localize debonding in a composite material skin-stiffener joint. The UEL is used to represent the healthy case whereas the damaged case is simulated using Abaqus. It is shown that the ECCM successfully detects the location of the debond in the skin-stiffener joint. Advisors/Committee Members: Thomas E. Lacy (committee member), Rani Warsi Sullivan (committee member), Youssef Hammi (committee member), Cara A.C. Leckey (committee member), Ratneshwar Jha (chair), Masoud Rais-Rohani (committee member).

Subjects/Keywords: SHM; Lamb Wave; Wave Propagation; UEL; Abaqus; FEM; Spectral Finite Element; Cross-Correlation; Structural Health Monitoring

10 more images…

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Khalili, A. (2017). Spectrally formulated user-defined element in Abaqus for wave motion analysis and health monitoring of composite structures. (Doctoral Dissertation). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-03222017-100343/ ;

Chicago Manual of Style (16^th Edition):

Khalili, Ashkan. “Spectrally formulated user-defined element in Abaqus for wave motion analysis and health monitoring of composite structures.” 2017. Doctoral Dissertation, Mississippi State University. Accessed April 20, 2021. http://sun.library.msstate.edu/ETD-db/theses/available/etd-03222017-100343/ ;.

MLA Handbook (7^th Edition):

Khalili, Ashkan. “Spectrally formulated user-defined element in Abaqus for wave motion analysis and health monitoring of composite structures.” 2017. Web. 20 Apr 2021.

Vancouver:

Khalili A. Spectrally formulated user-defined element in Abaqus for wave motion analysis and health monitoring of composite structures. [Internet] [Doctoral dissertation]. Mississippi State University; 2017. [cited 2021 Apr 20]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-03222017-100343/ ;.

Council of Science Editors:

Khalili A. Spectrally formulated user-defined element in Abaqus for wave motion analysis and health monitoring of composite structures. [Doctoral Dissertation]. Mississippi State University; 2017. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-03222017-100343/ ;

Mississippi State University

27. Tucker, Laura Arias. MICROSTRUCTURE-PROPERTY RELATIONS THROUGH THE POWDER METALLURGY PROCESS.

Degree: MS, Mechanical Engineering, 2008, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-11092007-005857/ ;

► To produce crack free powder compacts with desirable mechanical properties and uniform densities, a predictive finite element simulation of the powder metallurgy process is necessary… (more)

Subjects/Keywords: powder metallurgy; microstructure characterization; density measurements; low alloy steel

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Tucker, L. A. (2008). MICROSTRUCTURE-PROPERTY RELATIONS THROUGH THE POWDER METALLURGY PROCESS. (Masters Thesis). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-11092007-005857/ ;

Chicago Manual of Style (16^th Edition):

Tucker, Laura Arias. “MICROSTRUCTURE-PROPERTY RELATIONS THROUGH THE POWDER METALLURGY PROCESS.” 2008. Masters Thesis, Mississippi State University. Accessed April 20, 2021. http://sun.library.msstate.edu/ETD-db/theses/available/etd-11092007-005857/ ;.

MLA Handbook (7^th Edition):

Tucker, Laura Arias. “MICROSTRUCTURE-PROPERTY RELATIONS THROUGH THE POWDER METALLURGY PROCESS.” 2008. Web. 20 Apr 2021.

Vancouver:

Tucker LA. MICROSTRUCTURE-PROPERTY RELATIONS THROUGH THE POWDER METALLURGY PROCESS. [Internet] [Masters thesis]. Mississippi State University; 2008. [cited 2021 Apr 20]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-11092007-005857/ ;.

Council of Science Editors:

Tucker LA. MICROSTRUCTURE-PROPERTY RELATIONS THROUGH THE POWDER METALLURGY PROCESS. [Masters Thesis]. Mississippi State University; 2008. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-11092007-005857/ ;

Mississippi State University

28. Grewal, Harpreet Singh. FINITE ELEMENT ANALYSIS OF THE POWDER METAL AUTOMOTIVE MAIN BEARING CAP.

Degree: MS, Mechanical Engineering, 2009, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-04032009-104622/ ;

► In order to produce crack free metal powder compacts, the critical region of failure should be detected, so that the particular region can be strengthened… (more)

Subjects/Keywords: PM; Bearing Cap

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Grewal, H. S. (2009). FINITE ELEMENT ANALYSIS OF THE POWDER METAL AUTOMOTIVE MAIN BEARING CAP. (Masters Thesis). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-04032009-104622/ ;

Chicago Manual of Style (16^th Edition):

Grewal, Harpreet Singh. “FINITE ELEMENT ANALYSIS OF THE POWDER METAL AUTOMOTIVE MAIN BEARING CAP.” 2009. Masters Thesis, Mississippi State University. Accessed April 20, 2021. http://sun.library.msstate.edu/ETD-db/theses/available/etd-04032009-104622/ ;.

MLA Handbook (7^th Edition):

Grewal, Harpreet Singh. “FINITE ELEMENT ANALYSIS OF THE POWDER METAL AUTOMOTIVE MAIN BEARING CAP.” 2009. Web. 20 Apr 2021.

Vancouver:

Grewal HS. FINITE ELEMENT ANALYSIS OF THE POWDER METAL AUTOMOTIVE MAIN BEARING CAP. [Internet] [Masters thesis]. Mississippi State University; 2009. [cited 2021 Apr 20]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-04032009-104622/ ;.

Council of Science Editors:

Grewal HS. FINITE ELEMENT ANALYSIS OF THE POWDER METAL AUTOMOTIVE MAIN BEARING CAP. [Masters Thesis]. Mississippi State University; 2009. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-04032009-104622/ ;

Mississippi State University

29. Solanki, Kiran Nainmal. PHYSICALLY MOTIVATED INTERNAL STATE VARIABLE FORM OF A HIGHER ORDER DAMAGE MODEL FOR ENGINEERING MATERIALS WITH UNCERTAINTY.

Degree: PhD, Mechanical Engineering, 2008, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-11062008-200935/ ;

► Many experiments demonstrate that isotropic ductile materials used in engineering applications develop anisotropic damage and shows significant variation in elongation to failure. This anisotropic damage… (more)

Subjects/Keywords: Finite-strain; Elastic-plastic; Thermodynamics; Void Growth; Anisotropic Damage; Material Length Scale; Model Verification and Validation; Internal State Variable; Uncertainty; Kinematics; Void Nucleation

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Solanki, K. N. (2008). PHYSICALLY MOTIVATED INTERNAL STATE VARIABLE FORM OF A HIGHER ORDER DAMAGE MODEL FOR ENGINEERING MATERIALS WITH UNCERTAINTY. (Doctoral Dissertation). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-11062008-200935/ ;

Chicago Manual of Style (16^th Edition):

Solanki, Kiran Nainmal. “PHYSICALLY MOTIVATED INTERNAL STATE VARIABLE FORM OF A HIGHER ORDER DAMAGE MODEL FOR ENGINEERING MATERIALS WITH UNCERTAINTY.” 2008. Doctoral Dissertation, Mississippi State University. Accessed April 20, 2021. http://sun.library.msstate.edu/ETD-db/theses/available/etd-11062008-200935/ ;.

MLA Handbook (7^th Edition):

Solanki, Kiran Nainmal. “PHYSICALLY MOTIVATED INTERNAL STATE VARIABLE FORM OF A HIGHER ORDER DAMAGE MODEL FOR ENGINEERING MATERIALS WITH UNCERTAINTY.” 2008. Web. 20 Apr 2021.

Vancouver:

Solanki KN. PHYSICALLY MOTIVATED INTERNAL STATE VARIABLE FORM OF A HIGHER ORDER DAMAGE MODEL FOR ENGINEERING MATERIALS WITH UNCERTAINTY. [Internet] [Doctoral dissertation]. Mississippi State University; 2008. [cited 2021 Apr 20]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-11062008-200935/ ;.

Council of Science Editors:

Solanki KN. PHYSICALLY MOTIVATED INTERNAL STATE VARIABLE FORM OF A HIGHER ORDER DAMAGE MODEL FOR ENGINEERING MATERIALS WITH UNCERTAINTY. [Doctoral Dissertation]. Mississippi State University; 2008. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-11062008-200935/ ;

Mississippi State University

30. Stone, Tonya Williams. MOLECULAR DYNAMICS SIMULATIONS OF NANOPARTICLE INTERACTIONS.

Degree: MS, Engineering, 2006, Mississippi State University

URL: http://sun.library.msstate.edu/ETD-db/theses/available/etd-04172006-154715/ ;

► Molecular dynamics simulations using the Embedded Atom Method were performed to describe the interparticle behavior of two single crystal spherical nickel nanoparticles during compaction based… (more)

Subjects/Keywords: compaction; nanoparticle; molecular dynamics; contact surface; plastic indentation; compaction; nanoparticle; molecular dynamics; contact surface; plastic indentation; compaction; nanoparticle; molecular dynamics; contact surface; plastic indentation; compaction; nanoparticle; molecular dynamics; contact surface; plastic indentation

Record Details Similar Records Cite « Share

❌

APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Stone, T. W. (2006). MOLECULAR DYNAMICS SIMULATIONS OF NANOPARTICLE INTERACTIONS. (Masters Thesis). Mississippi State University. Retrieved from http://sun.library.msstate.edu/ETD-db/theses/available/etd-04172006-154715/ ;

Chicago Manual of Style (16^th Edition):

Stone, Tonya Williams. “MOLECULAR DYNAMICS SIMULATIONS OF NANOPARTICLE INTERACTIONS.” 2006. Masters Thesis, Mississippi State University. Accessed April 20, 2021. http://sun.library.msstate.edu/ETD-db/theses/available/etd-04172006-154715/ ;.

MLA Handbook (7^th Edition):

Stone, Tonya Williams. “MOLECULAR DYNAMICS SIMULATIONS OF NANOPARTICLE INTERACTIONS.” 2006. Web. 20 Apr 2021.

Vancouver:

Stone TW. MOLECULAR DYNAMICS SIMULATIONS OF NANOPARTICLE INTERACTIONS. [Internet] [Masters thesis]. Mississippi State University; 2006. [cited 2021 Apr 20]. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-04172006-154715/ ;.

Council of Science Editors:

Stone TW. MOLECULAR DYNAMICS SIMULATIONS OF NANOPARTICLE INTERACTIONS. [Masters Thesis]. Mississippi State University; 2006. Available from: http://sun.library.msstate.edu/ETD-db/theses/available/etd-04172006-154715/ ;

		in
And / Or
		in
And / Or
		in
And / Or
		in

Open Access Theses and Dissertations