Engineering Commons^™

Finite Element Modeling Of Ballistic Impact On A Glass Fiber Composite Armor, Dan M. Davis

Master's Theses

Finite Element Modeling of Ballistic Impact on a Glass Fiber Composite Armor

Dan Davis

Experiments measuring the ballistic performance of a commercially available fiberglass armor plate were used to guide the development of constitutive laws for a finite element model of the impact. The test samples are commercially available armor panels, made from E-glass fiber reinforced polyester rated to NIJ level III. Quasi-static tensile tests were used to establish material properties of the test panels. These properties were then used to create models in the explicit finite element code LSDYNA.

Ballistic impact testing of the panels was conducted using a …

The Case For Open Source Appropriate Technology, Joshua M. Pearce

Michigan Tech Publications, Part 1

Much of the widespread poverty, environmental desecration, and waste of human life seen around the globe could be prevented by known (to humanity as a whole) technologies, many of which are simply not available to those that need it. This lack of access to critical information for sustainable development is directly responsible for a morally and ethically unacceptable level of human suffering and death. A solution to this general problem is the concept of open source appropriate technology or OSAT, which refers to technologies that provide for sustainable development while being designed in the same fashion as free and open …

Process Optimization For Friction-Stir-Welded Martensitic Steel, M. Ghosh, K. Kumar, R. S. Mishra

Materials Science and Engineering Faculty Research & Creative Works

Advanced high-strength M190 steel sheets were joined by friction-stir welding under different tool rotational and traversing speeds. the optical microstructure of the joints exhibited complete martensite and partial martensite at the weld nugget depending on the cooling rate during welding. the first heat-affected zone outside of the weld nugget revealed ferrite-pearlite phase aggregate, and the second heat-affected zone showed a tempered martensitic structure. the interplay of process variables in terms of peak temperature and cooling rate was studied to observe their effect on joint efficiency under shear testing. the peak hardness at weld nugget was close to the parent alloy …

The Incorporation Of Electrohydrodynamics And Other Modifications Into A Dry Spinning Model To Develop A Theoretical Framework For Electrospinning, Yuki Imura

Dissertations

The objective of this research was the development of a mathematical model of the electrospinning process using dry spinning modeling principles as a basis. This model is directed at the identification of parameters which influence final fiber characteristics, e.g., solvent concentration, temperature, spin line tension, and electric field. Preliminary computer simulations were performed; however, the generated data was inconclusive and was determined to be due in part to the complexity of the modeled system and the subsequent computational difficulties encountered. Although a comprehensive computational model of the electrospinning process has not yet been demonstrated, the theoretical development that was undertaken …

Synthesis, Molecular And Solid State Structures, And Magnetic Properties Of Sandwich Lanthanide Phthalocyanines Lacking C-H Bonds, Wycliffe A. Graham

Dissertations

A new class of sandwich phthalocyanine (Pc) compounds without C-H bonds was synthesized and characterized. They are the bis[octakis(perfluoro i-C₃F₇) octakis(perfluoro)phthalocyaninato(2−)]M(III) complexes, formulated as (F₆₄Pc)₂MH, M = Tb, Dy, Lu, Y. Single molecular magnetic (SMM) behavior in the (F₆₄Pc)₂TbH and (F₆₄Pc)₂DyH complexes was confirmed through slowed relaxation response of their magnetization in an applied time varying magnetic field during alternating current (AC) magnetic testing in the range 2 - 50 K. The energy barrier to magnetic reversal, Δ = 215 cm^-1 and …

Rational Design Of Hydrogen-Free Catalytic Active Sites, Andrei Ioan Loas

Dissertations

Materials that are organic-based and exhibit oxidative catalytic activity, including free-radical pathways, while being refractory to the activated oxygen species are not known. The synthesis of several classes of such materials, their electronic and structural characterizations as well as catalytic properties are reported. Their rational molecular design and biologically inspired reactivity are based on enzymatic active sites, which are reengineered into robust metal-organic fluoroalkylated scaffolds that, for the first time, exhibit structural asymmetry and tunable π-π interactions both in solution and solid state. In these complexes, labile C-H bonds are replaced with chemically and thermally resistant C-F bonds to create …

Inkjet Printing Of Resistive-Type Humidity Sensor For Harsh Environments, Hamed Kazerani

Dissertations

A flexible resistive-type humidity sensor for harsh environments is successfully designed and fabricated by an inkjet printing method using a Dimatix materials printer (DMP-2800 series from Fujifilm). Construction of the sensors is based on inkjet printed interdigitated silver electrodes on a polyimide flexible substrate along with an inkjet printable polyaniline (PANi) as humidity sensitive material. A copolymer of ethylene and vinyl alcohol (EVOH) is used as sensor protective coating. Double strand water- soluble PANi ink is synthesized by polymerization of aniline monomers with poly(4- styrenesulfonic acid) (PSSA) as a template.

Manufactured devices showed high sensitivity (/% @ 45%RH) to humidity …

Magnetic Iron Oxide Nanoparticles: Synthesis, Characteristics, Magnetic Behavior, And Biomedical Applications, Chengyin Fu

Theses

Magnetic iron oxide nanoparticles are attracting increasing attention due to their interesting properties that can be applied in a great number of applications such as catalysis and biomedicine. This thesis focuses on the synthesis, characteristics, and biomedical applications of iron oxide nanoparticles. The two most common iron oxides, including magnetite and maghemite, are discussed in this thesis.

For most of their applications, the magnetic behavior of iron oxide nanoparticles in a fluid is very important, especially, the high gradient magnetic separation of the particles from a nonmagnetic liquid medium, such as blood in the human body. A 2D model, which …

Simulation Of Polymer Solar Cell Characteristics By Amps-1d, Lu Zhang

Theses

Simulation of polymer solar cell characteristics is presented in this study. The solar cells are made of materials such as the following: Poly (3-hexylthiophene): [6, 6]-phenyl C61- butyric acid methylester (P3HT: PCBM) and poly[2,1,3-benzothiadiazole-4,7-diyl[4,4- bis(2-ethylhexyl)-4H-cyclopenta[2,1-b:3,4-b']dithiophene-2,6-diyl]]: [6, 6]-phenyl C₆₁- butyric acid methylester (PCPDTBT: PCBM) are used as active layer materials. Analysis of Microelectronic and Photonic Structures One Dimension (AMPS-1D) is a computer simulation tool for solar cell device characteristics. The first part of this study focuses on the performance and comparison of current-voltage (I-V) simulations of indium oxide (In₂O₃) and tin oxide (SnO₂) …

Magnetic Targeted Drug Delivery System In Gene Therapy, Weilong Lu

Theses

Drug delivery system is a method to transport the drug of the required amount accurately to the targeted diseased part. Recently, the concept of Magnetic Targeted Drug Delivery System (MTDDS), based upon magnetic particles under the action of an external magnetic field, exhibits considerable potential for a wide range of medical applications. Gene therapy is the insertion of genes into an individual's cells and tissues to treat diseases. As the recombinant virus vector has many limits and problems, more studies turn to the nonvirus vectors, which have transfection efficiency and low cytotoxicity. PLLA(poly(L lactic acid)) can be biodegradable and has …

Glasses For Radiotherapy, Delbert E. Day

Materials Science and Engineering Faculty Research & Creative Works

No abstract provided.

Active Response Of Polymer Materials From External Stimuli – Solvents And Light; Grafting Reactions On Perovskite Layers, Jianxia Zhang

LSU New Orleans Theses and Dissertations

The active response of a series of polymeric materials was investigated. Both solvent activated and light activated thin films and wire systems show dynamic behaviors when exposed to different stimuli.

Solvent mediated fluxional behavior of polymer thin films involved extensive, rapid curling both on infusion and evaporation of good solvents. These films can be either lab-fabricated ones or commercial ones, and the curling behavior can be as fast as seconds. Conditions including polymer materials, chosen solvents, and film geometry can affect the behavior.

Methods that allowed for the creation and retention of distorted wire structures were also developed; the asymmetric …

High Temperature Mechanical Properties Of Zirconium Diboride, L.J. Vandeperre, J. Wang, F. Giuliani

Ultra-High Temperature Ceramics: Materials For Extreme Environmental Applications II

No abstract provided.

Ultra-High Temperature Thermal And Mechanical Properties Of Zrb2-Based Ceramics, Greg Hilmas, Bill Fahrenholtz

Ultra-High Temperature Ceramics: Materials For Extreme Environmental Applications II

No abstract provided.

Advanced Characterization Of Composite Ultra High Temperature Ceramic Systems, W.E. Lee, Emily Eakins, Heather Jackson, Doni Jayaseelan

Ultra-High Temperature Ceramics: Materials For Extreme Environmental Applications II

No abstract provided.

High Temperature Mechanical, Oxidation And Shock Resistance Properties Of Hot Pressed And Spark Plasma Sintered Tib2-Based Ceramics, Bikramjit Basu, G.B. Raju, V. Jayaram, K.P.J. Reddy

Ultra-High Temperature Ceramics: Materials For Extreme Environmental Applications II

No abstract provided.

Microstructures And Thermal Conductivities Of Hot-Pressed Zrb2-Sic Ceramics With A Variety Of Sic Sources, Seongwon Kim, Chang-Sup Kwon, Sung-Min Lee, Yoon-Suk Oh, Hyung-Tae Kim, Byung-Koog Jang

Ultra-High Temperature Ceramics: Materials For Extreme Environmental Applications II

No abstract provided.

Where We Are With The Understanding Of Metal/Ceramic Interactions: The Case Of Transition Metal Borides, A. Passerone, F. Valenza, C. Artini, M.L. Muolo

Ultra-High Temperature Ceramics: Materials For Extreme Environmental Applications II

No abstract provided.

Correlation Of Shear Strength Between Longitudial And Transverse Specimens, Erasto A. Fernandez

LSU New Orleans Theses and Dissertations

In this thesis, new methods for shear strength are proposed and backed up through extensive experimentation, ABAQUS models and data analysis of Titanium welds of three different alloys. The results are compared with those obtained by using the procedure outlined by AWS B4 for calculating Shear Strength in the transverse and longitudinal directions; this equation is widely used by the American Welding Society (AWS) and all those in search of more efficient designs involving welding.

It is a well-documented issue that the equation provided by AWS yields a large discrepancy between the values for shear strength of longitudinal and transverse …

A Cost Effective Screening Technique For Testing Uhtc Materials Using An Oxyacetylene Torch Flame, Anish Paul, Saranya Venugopal, Jon Binner, Bala Vaidhyanathan, Andrew Heaton, Peter Brown

Ultra-High Temperature Ceramics: Materials For Extreme Environmental Applications II

No abstract provided.

Uhtc-Based Hot Structures For Space Re-Entry: Lesson Learned And Future Perspectives, Luigi Scatteia

Ultra-High Temperature Ceramics: Materials For Extreme Environmental Applications II

No abstract provided.

Solid State Diffusion Bonding Of Zrc To Zr-Based Alloys, Andrew Gillen, Lyndon Edwards, Daniel Riley, George Franks

Ultra-High Temperature Ceramics: Materials For Extreme Environmental Applications II

No abstract provided.

Joining Of Ultra-High Temperature Ceramics, Laura Silvestroni, Diletta Sciti, Laura Esposito, Andreas Glaeser

Ultra-High Temperature Ceramics: Materials For Extreme Environmental Applications II

No abstract provided.

Fusion Welding Of Zrb2-Based Ceramics, H.J. Brown, W.G. Fahrenholtz, G.E. Hilmas

Ultra-High Temperature Ceramics: Materials For Extreme Environmental Applications II

No abstract provided.

Low Temperature Synthesis And Sintering Of Mechanically Activated Zrb2 Powders, Mustafa Tuncer

Ultra-High Temperature Ceramics: Materials For Extreme Environmental Applications II

No abstract provided.

In-Situ Imaging And Strain Determination During Fracture In A Sic/Sic Ceramic Matrix Composite, Joaquin Ramirez, F. Stoltzenburg, K.T. Faber, J. Almer, D. Singh, J. Routbort

Ultra-High Temperature Ceramics: Materials For Extreme Environmental Applications II

No abstract provided.

Microstructure Formation Pathways In Tantalum Carbides, Gregory Thompson, Robert Morris, Billie Wang, Bardford Schulz, Nick Deleon, Christopher Weinberger, Daniel Butts, Stephan Diepetrio, Lawrence Matson

Ultra-High Temperature Ceramics: Materials For Extreme Environmental Applications II

No abstract provided.

Program, Engineering Conferences International

Ultra-High Temperature Ceramics: Materials For Extreme Environmental Applications II

No abstract provided.

First Principles Investigation On Chemical Bonding Of Transition Metal Borides And Carbides, Junshan Wang, Yanchun Zhou

Ultra-High Temperature Ceramics: Materials For Extreme Environmental Applications II

No abstract provided.

Fabrication Of Tac-Hfc Ceramics For Ultra-High Temperature Applications, Omar Cedillos, Doni Jayaseelan, Bill Lee

Ultra-High Temperature Ceramics: Materials For Extreme Environmental Applications II

No abstract provided.