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Comparative Analysis And Dynamic Response Of Garolites Under Temperature Spectrum Using Low Velocity Impact Test, Birendra Chaudhary 2020 University of Mississippi

Comparative Analysis And Dynamic Response Of Garolites Under Temperature Spectrum Using Low Velocity Impact Test, Birendra Chaudhary

Honors Theses

The purpose of this study was to examine the dynamic response of three different grades of garolites under the temperature spectrum. High-Temperature G-11 Sheet (HTG), Impact Resistance Garolite E-glass (HIG), and Economical Garolite (EG) were tested using an Instron Dynatup 8250 impact tester. Three specimens were used for all three composites and were tested at 6 different temperatures, -10oC, 25oC, 50oC, 100oC, 150oC and 200oC using the Low-Velocity Impact Machine with 20 Kip punch shear load cell. The results showed that HIG had the highest resistance to punch ...


Dynamic Characterization Of Duroprotect, A Fiber-Reinforced Ballistics Composite, Ivy A. Turner 2020 University of Mississippi

Dynamic Characterization Of Duroprotect, A Fiber-Reinforced Ballistics Composite, Ivy A. Turner

Honors Theses

Dynamic characterization of materials has become increasingly common, as it is important to understand how materials behave under sudden loads. Understanding these properties can aid in material selection for novel designs. DuroProtect, a fiber-reinforced ballistics composite developed by Rӧchling, was tested for its dynamic properties at high strain-rates. The Split Hopkinson Pressure Bar (SHPB) test was used to obtain dynamic properties at high strain-rates under compressive loading conditions. Tests were initially conducted to validate force equilibriums for each sample. The data measured from the strain gages mounted on the incident and transmission bars and the elastic wave propagation theories yields ...


Surface Driven Flows : Liquid Bridges, Drops And Marangoni Propulsion, Samrat Sur 2020 University of Massachusetts Amherst

Surface Driven Flows : Liquid Bridges, Drops And Marangoni Propulsion, Samrat Sur

Doctoral Dissertations

Molecules sitting at a free liquid surface against vacuum or gas have weaker binding than molecules in the bulk. The missing (negative) binding energy can therefore be viewed as a positive energy added to the surface itself. Since a larger area of the surface contains larger surface energy, external forces must perform positive work against internal surface forces to increase the total area of the surface. Mathematically, the internal surface forces are represented by surface tension, defined as the normal force per unit of length. One common manifestation of surface tension is the difference in pressure it causes across a ...


Table Top Dome Tester, Travis Bernard, Sarah Kassinger, Amanda O'Reilly, Scott Salerno 2020 The University of Akron

Table Top Dome Tester, Travis Bernard, Sarah Kassinger, Amanda O'Reilly, Scott Salerno

Williams Honors College, Honors Research Projects

The Erichsen Cupping Test was used as a basis to design a dome tester. The intention of a dome tester is to test sheet metal material properties in all directions. This was done by clamping a piece of sheet metal and using a piston and hydraulic press to punch through the material. The force used to punch the material and the height of the deforming material can be gathered and the sheet metal properties can then be calculated. At the end of the project the team was able to successfully design and manufacture a hydraulic dome tester. However, due to ...


Tabletop Mechanical Tester, Jamie Dombroski, Andrew Shirk, Richard Leffler, Brian English 2020 The University of Akron

Tabletop Mechanical Tester, Jamie Dombroski, Andrew Shirk, Richard Leffler, Brian English

Williams Honors College, Honors Research Projects

The need for hands-on and face-to-face experiences in the engineering classroom is very great. The equations, principles, and concepts can all be learned, but without the visual and tactile application, these don’t always sink in or become concrete. A small-scale tensile test machine was designed, sourced, manufactured, and tested for the purpose of being applied in classroom settings to provide this experience to engineering students. Extensive research was performed concerning tensile machines on the market, the essential elements of which are the load cell, grips, crosshead, extensometer, motor, and frame. The raw materials for the frame were purchased and ...


Tabletop Mechanical Tester, Jamie Dombroski, Brian English, Richard Leffler, Andrew Shirk 2020 The University of Akron

Tabletop Mechanical Tester, Jamie Dombroski, Brian English, Richard Leffler, Andrew Shirk

Williams Honors College, Honors Research Projects

The need for hands-on and face-to-face experiences in the engineering classroom is very great. The equations, principles, and concepts can all be learned, but without the visual and tactile application, these don’t always sink in or become concrete. A small-scale tensile test machine was designed, sourced, manufactured, and tested for the purpose of being applied in classroom settings to provide this experience to engineering students. Extensive research was performed concerning tensile machines on the market, the essential elements of which are the load cell, grips, crosshead, extensometer, motor, and frame. The raw materials for the frame were purchased and ...


Solvent-Free Coating Using Maco Bio-Based Reactive Diluent, Ryder James 2020 The University of Akron

Solvent-Free Coating Using Maco Bio-Based Reactive Diluent, Ryder James

Williams Honors College, Honors Research Projects

The project performed utilizes methacrylated cardanol (MACO) and a linseed oil resin to test how different weight percentages of MACO affect coating performance. MACO is synthesized from a phenolic lipid extracted from cashew nut shells, which are a cashew industry waste product. Not only does it utilize a waste product, but being a bio-based reactive diluent means it can replace the use of volatile organic solvents that are harmful to both humans and the environment. Weight percentage samples of 0%, 10%, 20%, 30%, and 40% were used. Coatings were applied using a 6-mil drawn down bar, with samples being prepared ...


Chloride Effect In Fly Ash Geopolymer Cement, Evan Dimmick 2020 The University of Akron

Chloride Effect In Fly Ash Geopolymer Cement, Evan Dimmick

Williams Honors College, Honors Research Projects

The production of ordinary portland cement (OPC) poses a significant impact on the world's carbon dioxide emissions through the wide global use of concrete. Geopolymer cements (GPC) made from alkali activated fly ash can serve as a replacement to OPCs, reducing the carbon dioxide emissions by as much as 80%. GPCs exhibit adequate or superior mechanical performance to OPCs. The corrosion of carbon steel rebar in concrete occurs largely from chloride ion attack. The focus of this project will be to experimentally determine the coefficient of diffusion for chloride ions in GPCs and OPCs and compare to the corrosion ...


Effects Of Sensitization On Intergranular Boundaries Of Aluminum Alloy 5083, Kyle Balentine 2020 The University of Akron

Effects Of Sensitization On Intergranular Boundaries Of Aluminum Alloy 5083, Kyle Balentine

Williams Honors College, Honors Research Projects

The purpose of this Honors Research Project is to show the effect of sensitization on intergranular corrosion (IGC) on AA5083. Sensitization is the process of a material to experience microstructural phase change, caused by thermal treatment, which promotes precipitation of secondary phases on the grain boundaries. The nitric acid mass loss test (NAMLT), SEM analysis, cyclic potentiodynamic polarization (CPP), and Electrochemical Impedance Spectroscopy (EIS) were performed to find a correlation to the degree of sensitization (DOS) and the pitting and IGC mechanisms. The DOS increased as heat treatment was applied. The SEM images displayed no clear precipitates on the grain ...


Magnetic Refrigerator Device Based On La (Fexcoysi1-X-Y)13, Khushar Javed 2020 Virginia Commonwealth University

Magnetic Refrigerator Device Based On La (Fexcoysi1-X-Y)13, Khushar Javed

Theses and Dissertations

Particles of Lanthanum-iron-silicide, La (FexCoySi1-x-y)13exhibit different magnetic properties when stored in air compared to the same stored in water. The sample with a nominal composition of La(Fe0.842Co0.073Si0.084)13was prepared by arc-melting from elements under argon atmosphere. In recent years, there has been research conducted on different processes that could drastically reduce energy costs of cooling and replacing gas compressors with magnetocaloric materials. Magnetization measurements were carried out on this magnetocaloric material to characterize it in order to design magnetic refrigerator device based on it ...


Jominy Hardenability Tester With In-Situ Heating, Luke Allen 2020 The University of Akron

Jominy Hardenability Tester With In-Situ Heating, Luke Allen

Williams Honors College, Honors Research Projects

This project centers on building a Jominy Hardenability tester with In-Situ heating for the manufacturing lab at the University of Akron. A new process and setup will be designed using engineering concepts in order to make the testing more efficient and safer for the teaching and testing of metal hardness. The current Jominy testing setup has efficiency issues within the transfer of specimen from induction heater to testing rig. Our design will simplify the design by creating a test rig that removes the traveling aspect of the specimen which will limit the amount of premature cooling done and will be ...


Effect Of Incorporating Pottery And Bottom Ash As Partial Replacement Of Cement, Bassam A. Tayeh, Doha M. AlSaffar, Lawend K. Askar, Asmahan Issa Jubeh 2019 The Islamic University of Gaza

Effect Of Incorporating Pottery And Bottom Ash As Partial Replacement Of Cement, Bassam A. Tayeh, Doha M. Alsaffar, Lawend K. Askar, Asmahan Issa Jubeh

Karbala International Journal of Modern Science

This study addressed the environmental constraints in cement produc­tion. Ordinary Portland cement (OPC) was replaced with pottery powder (PP, produced by grinding locally available pottery) and bottom ash (BA) at 10%, 20% and 30% of cement mass. Moreover, 4% calcium chloride solution (CaCl2.2H2O) was used as mixing water. Material properties, such as standard consistency, setting time and compressive strength, were measured with different percentages of OPC replacement with PP and BA. Results indicated that the replacement with PP and BA increased the water demand to achieve the standard consistency. These results revealed that the strength ...


Nanoscale Optical And Correlative Microscopies For Quantitative Characterization Of Dna Nanostructures, Christopher Michael Green 2019 Boise State University

Nanoscale Optical And Correlative Microscopies For Quantitative Characterization Of Dna Nanostructures, Christopher Michael Green

Boise State University Theses and Dissertations

Methods to engineer nanomaterials and devices with uniquely tailored properties are highly sought after in fields such as manufacturing, medicine, energy, and the environment. The macromolecule deoxyribonucleic acid (DNA) enables programmable self-assembly of nanostructures with near arbitrary shape and size and with unprecedented precision and accuracy. Additionally, DNA can be chemically modified to attach molecules and nanoparticles, providing a means to organize active materials into devices with unique or enhanced properties. One particularly powerful form of DNA-based self-assembly, DNA origami, provides robust structures with the potential for nanometer-scale resolution of addressable sites. DNA origami are assembled from one large DNA ...


Development Of Multicomponenet Eam Potential For Ni-Based Superalloy, Muztoba Rabbani 2019 Missouri State University

Development Of Multicomponenet Eam Potential For Ni-Based Superalloy, Muztoba Rabbani

MSU Graduate Theses

We initiated the development of multi-component EAM potentials for Aluminides and Carbides, key phases in Ni-based Superalloys. The goal is to utilize the MD simulation to understand the deformation dynamics that contribute to the formation of voids and creep initiation. For this purpose, we constructed the raw data from ab-initio (molecular dynamics) MD simulations fed into the potential development code and used Nickel as the base metal with the addition of a number of various elements including Aluminum, Chromium, Tungsten. We then developed the EAM potentials for the aluminide and carbide phases using the force-fitting code MEAMfit. Our generated potential ...


Molecular Dynamics Study Of Creep Deformation In Nickel-Based Superalloy, Sabila Kader Pinky 2019 Missouri State University

Molecular Dynamics Study Of Creep Deformation In Nickel-Based Superalloy, Sabila Kader Pinky

MSU Graduate Theses

The present study employs molecular dynamics simulations of Ni-based superalloy to investigate the creep behavior under uniaxial compression test. Dislocation dynamics is analyzed for the nickel-based single crystal superalloy with the presence of void and with varying the distribution of gamma-prime phase The results show that multiple-void systems are more prone to yield than single-void systems and single-void systems are more prone to yield than the system without void. From the simulations, it has been determined that the creep mechanism in Ni/Ni3Al is subject to change on the applied stress depending on the distribution of gamma-prime phases change. Dislocation ...


Micromechanics Of Plasticity Of Zr-2.5%Nb Alloy, Md Imran Khan 2019 The University of Western Ontario

Micromechanics Of Plasticity Of Zr-2.5%Nb Alloy, Md Imran Khan

Electronic Thesis and Dissertation Repository

Zirconium alloys are used in many thermal neutron fission reactors because of their very low neutron interaction cross-sections along with their excellent mechanical strength and corrosion resistance. Numerous experiments have been conducted on these alloys at the bulk scale to determine their mechanical properties. Recent advancements in micro-mechanical testing make it easier to study site-specific mechanical properties for micron or submicron-sized samples. Understanding the mechanical response of such small volumes of material is extremely important for developing accurate models to predict the ductile fracture toughness of these in-reactor materials. Pressure tubes made of Zr-2.5%Nb alloys are an integral ...


Why The Crackling Deformations Of Single Crystals, Metallic Glasses, Rock, Granular Materials, And The Earth’S Crust Are So Surprisingly Similar, Karin A. Dahmen, Jonathan T. Uhl, Wendelin J. Wright 2019 University of Illinois at Urbana-Champaign

Why The Crackling Deformations Of Single Crystals, Metallic Glasses, Rock, Granular Materials, And The Earth’S Crust Are So Surprisingly Similar, Karin A. Dahmen, Jonathan T. Uhl, Wendelin J. Wright

Faculty Journal Articles

Recent experiments show that the deformation properties of a wide range of solid materials are surprisingly similar. When slowly pushed, they deform via intermittent slips, similar to earthquakes. The statistics of these slips agree across vastly different structures and scales. A simple analytical model explains why this is the case. The model also predicts which statistical quantities are independent of the microscopic details (i.e., they are "universal"), and which ones are not. The model provides physical intuition for the deformation mechanism and new ways to organize experimental data. It also shows how to transfer results from one scale to ...


The Effect Of Calcium Nitrate On The Hydration Of Calcium Aluminate Cement At Different Curing Temperatures, Hongxia Wang, Guizhi Diao, Guanghua Liu, H Wang, Lixiong Gao, Guangwei Liu 2019 China Building Materials Academy,State Key Laboratory of Green Building Materials

The Effect Of Calcium Nitrate On The Hydration Of Calcium Aluminate Cement At Different Curing Temperatures, Hongxia Wang, Guizhi Diao, Guanghua Liu, H Wang, Lixiong Gao, Guangwei Liu

International Conference on Durability of Concrete Structures

Phase conversion in calcium aluminate cements (CAC) induces significant volumetric instability; it would result in an increase in porosity and decrease in strength in CAC. In this study, calcium nitrate (CN) as a phase conversion inhibitor, the effect of CN on the hydration of CAC at different curing temperatures was studied. Xray diffraction, thermal analysis, SEM, isothermal calorimetry and the compressive strength were conducted on the CAC dosages of 0%, 5%, 10% and 15%CN cured at 20�, 30�, 40� and 50�. The results show CN can retard CAC hydration, alter the characters of the hydrates of CAC systems and ...


Reusable Nano-Structured Carbon Seawater Filter, Matheus Prates, Ian Durr 2019 Kennesaw State University

Reusable Nano-Structured Carbon Seawater Filter, Matheus Prates, Ian Durr

Georgia Undergraduate Research Conference (GURC)

Reusable Nanostructured Carbon Seawater Filter

Matheus Prates, Ian Durr, and Jungkyu Park

Kennesaw State University

In this study, we investigate seawater filtering capability of carbon nanostructures. Carbon based nanomaterials such as carbon nanotubes (CNT) and graphene are good candidates for the desalination of seawater. Since they are hydrophobic, only the organic contaminants in the water adhere to carbon nanomaterials while water molecules pass through efficiently. Moreover, water filters made of carbon nanomaterials are expected to be reusable because of their high melting point (higher than 3000 ºC). A simple heating method will evaporate all the contaminants in a carbon-based water ...


Atomistic Simulation Of Desalination, ian Durr, Matheus Prates 2019 Kennesaw State University

Atomistic Simulation Of Desalination, Ian Durr, Matheus Prates

Georgia Undergraduate Research Conference (GURC)

Atomistic Simulation of Desalination

Ian Durr, Matheus Prates, and Jungkyu Park

Kennesaw State University

In this research, we investigate the desalination capacity of three-dimensional (3D) carbon nanostructures using molecular dynamics simulations. 3D carbon nanostructures proposed here will filter seawater efficiently because of their multiple layers with holes of tunable sizes. The structure is designed to be flexible, allowing mechanical deformation during daily use. The 3D carbon nanostructure will still possess high thermal conductivity, enabling easy recycle through a simple heating process. Here, we employ LAMMPS, Large-scale Atomic/MolecularMassively Parallel Simulator distributed by Sandia National Laboratories to measure salt ion flux ...


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