Atomic Structure And Energetics Of Amorphous–Crystalline Cuzr Interfaces: A Molecular Dynamics Study,
2016
Shanghai Jiao Tong University
Atomic Structure And Energetics Of Amorphous–Crystalline Cuzr Interfaces: A Molecular Dynamics Study, X. Z. Gao, M. H. Müser, Lt Kong, J. F. Li
The 8th International Conference on Physical and Numerical Simulation of Materials Processing
No abstract provided.
Fem Investigation Of Spike Forging Test,
2016
COMTES FHT
Fem Investigation Of Spike Forging Test, Josef Hodek, Miroslav Urbanek, Michal Duchek
The 8th International Conference on Physical and Numerical Simulation of Materials Processing
No abstract provided.
Acoustic Management Of Library Fishbowls,
2016
California Polytechnic State University, San Luis Obispo
Acoustic Management Of Library Fishbowls, Zachary J. Lilley
Materials Engineering
The purpose of this project is to aid the Cal Poly Robert E. Kennedy library in modifying the “fishbowl” study spaces to more effectively maintain the desirable sound that is generated within the fishbowls while avoiding the entrance and exit of excess noise to and from the fishbowls. A collaboration between the Materials Engineering Department and the Architecture Department provided the combined expertise needed to design, test, and install a prototype acoustic treatment in fishbowl 216-R in consultation with the Cal Poly Library as the voice of the customer. The fishbowl’s undesirable acoustic properties can be attributed to the hard …
Reconfigurable Liquid Attenuated Collimator,
2016
Air Force Institute of Technology
Reconfigurable Liquid Attenuated Collimator, Larry W. Burggraf, Benjamin R. Kowash, Jack G. M. Fitzgerald
AFIT Patents
A reconfigurable radiographic aperture mask collimator apparatus includes a body portion configured to receive an attenuating liquid having a first attenuation value per unit volume. The apparatus further includes a grid portion mated to a face of the body portion and a plurality of passageways each having a cross sectional area and a length. The plurality of passageways is disposed within the grid portion. A plurality of plugs is slidably disposed within the plurality of passageways, and each of the plurality of plugs has a second attenuation value per unit volume less than the first attenuation value. One of the …
Characterizing Hmx/Ap Cocrystal Propellant Through Planar Laser Induced Fluorescence,
2016
Brigham Young University
Characterizing Hmx/Ap Cocrystal Propellant Through Planar Laser Induced Fluorescence, Seth M. Nielsen, Michael S. Powell, Steven F. Son
The Summer Undergraduate Research Fellowship (SURF) Symposium
Energetic cocrystals, or energetic materials that consist of two or more components that form a unique crystalline structure with unique properties, are currently being investigated as a possible method for decreasing the sensitivity of high energy density explosives for use in powerful solid composite propellants. Fuels more powerful than those in current use have not been practical because of their increased safety hazard due to higher sensitivity to being ignited. This has been one of the barriers that has prevented solid composite propellants from seeing significant improvements in performance. This study is an attempt to characterize a cocrystal of HMX …
High Strain Rate Experiments Of Energetic Material Binder,
2016
Purdue University
High Strain Rate Experiments Of Energetic Material Binder, Roberto Rangel Mendoza, Michael Harr, Weinong Chen
The Summer Undergraduate Research Fellowship (SURF) Symposium
Energetic materials, in particular HMX, is widely used in many applications as polymer bonded explosives (PBX) and rocket propellant. However, when damaged, HMX is known to be an unstable substance which renders it a hazardous material and in some cases unreliable. Finding critical mechanical conditions at high rates that render various forms of energetic materials as unreliable would be vital to understand the effects that vibrations and compression forces have on energetic materials. A better understanding would enable the ability to develop improvements in the manufacturing of PBX and rocker propellant. The method utilized to evaluate the mechanical properties of …
Thermoelectric Half-Heuslers: Synthesis, Processing, And Performance,
2016
Boise State University
Thermoelectric Half-Heuslers: Synthesis, Processing, And Performance, Joseph Robert Croteau
Boise State University Theses and Dissertations
Thermoelectric half-Heusler compounds have potential to convert the heat wasted from industrial and transportation processes to useful electricity. Among the highest performing half-Heusler compounds are nano-structured bulk materials which have been arc-melted, pulverized into a nano-powder, and sintered by DC-hot press. High performing n- and p-type half-Heusler compounds with nominal composition of Hf0.25Zr0.75NiSn0.99Sb0.01 and Nb0.75Ti0.25FeSb, respectively, have been provided to us in both dense and powder form by our collaborators at the University of Houston. We consolidate these powders by SPS, refine these powders to improve both particle size …
Verifying The Implementation Of An Anisotropic Grain Boundary Energy Model In Idaho National Lab’S Marmot,
2016
Brigham Young University Idaho
Verifying The Implementation Of An Anisotropic Grain Boundary Energy Model In Idaho National Lab’S Marmot, John-Michael H. Bradley, Evan D. Hansen, Jarin C. French, Yongfeng Zhang (Mentor)
Idaho Conference on Undergraduate Research
This work aims to verify the correct implementation of an anisotropic grain boundary (GB) energy model for face-centered cubic (FCC) and fluorite materials in Idaho National Laboratory’s phase field fuel performance code MARMOT. The model was recently implemented in MARMOT with the purpose of enabling higher fidelity simulations of UO2 nuclear fuels. As part of verification, tests were performed to measure the energy dependence on misorientation of high symmetry GBs in an FCC metal (Cu). The energies of the [100], [110], and [111] twist boundaries result as predicted, as do the energies of the [111] symmetric tilt boundaries. However, …
Carbon Fiber As Anode Material For Cathodic Prevention In Cementitious Materials,
2016
Chalmers University of Technology
Carbon Fiber As Anode Material For Cathodic Prevention In Cementitious Materials, Emma Qingnan Zhang, Luping Tang, Thomas Zack
International Conference on Durability of Concrete Structures
Cathodic prevention (CPre) technique is a promising method and has been used for the past two decades to prevent steel from corrosion in concrete structures. However, wide application of this technique has been restricted due to high costs of anode materials. In order to lower the cost and further improve this technique, carbon fiber composite anode has been introduced as an alternative anode material with affordable price and other outstanding properties. This paper presents the study of using carbon fiber mesh as anode material for long-term cathodic prevention system and the effect of accelerated current on macro- and microstructure of …
Comparison Study Of Tensile Strength , Ductility, And Fracture Mode Of H11, Arp 2000, And Mp35n Connecting Rod Bolts For Use In High Performance Racing Engines,
2016
California Polytechnic State University, San Luis Obispo
Comparison Study Of Tensile Strength , Ductility, And Fracture Mode Of H11, Arp 2000, And Mp35n Connecting Rod Bolts For Use In High Performance Racing Engines, Megan Mccabe, Samuel Randall
Materials Engineering
Oliver Racing Parts (ORP) has historically purchased connecting rod bolts made of high strength, high cost, nickel-cobalt alloy, MP35N, and a medium strength, low cost, proprietary tool steel called ARP 2000. ORP has recently acquired capabilities to manufacture their own bolts. To determine the quality of their product as it compares to their previous supplier, ORP produced three different types of ⅜” diameter bolts: one set of bolts made of MP35N, and two sets of H11 bolts, designated H11A and H11B for their respective processing. The H11, ARP 2000, and MP35N bolts were tensile tested using a custom designed test …
Selection Of A Flexible Polymer To Protect Dry Carbon Fibers In A Cfrp Wallet Hinge,
2016
California Polytechnic State University, San Luis Obispo
Selection Of A Flexible Polymer To Protect Dry Carbon Fibers In A Cfrp Wallet Hinge, Evan Dowey, Matthew Johnson
Materials Engineering
Common Fibers, a company founded by Cal Poly alumni, produces carbon fiber wallets. The invention of their built-in fiber-matrix composite hinge reduces the need for extra complexity and added mass that is inherent with using standard metal hinges to join standard composite panels. Replacing the polyurethane tape on the wallet hinge allows for improved protection while maintaining flexibility and other performance properties is critical to the success of such a design. The most important material property in this project is the bond strength between carbon fiber and a variety of flexible resin candidates. The silicone and urethane based elastomer resins …
Predicting Flexural Strength Of Composite Honeycomb Core Sandwich Panels Using Mechanical Models Of Face Sheet Compressive Strength,
2016
California Polytechnic State University, San Luis Obispo
Predicting Flexural Strength Of Composite Honeycomb Core Sandwich Panels Using Mechanical Models Of Face Sheet Compressive Strength, Nicholas Bruffey, William Shiu
Materials Engineering
The design process at Zodiac Aerospace requires the ability to accurately predict the strength of a composite honeycomb core sandwich panel to adhere to strict FAA regulations. The most common failure mode in long beam composites is in compression. Following ASTM D7249 for a four-point bend test of a long beam flexural test, a mechanical model has been developed that relates the compressive strength of glass fiber face sheets to the flexural strength of the sandwich panel. Zodiac does not currently have data on the compressive strength of the face sheets, so testing was performed to find this property. Asymmetric …
Shear Strength Of Carbon Fiber/Epoxy Hinges Using The V-Notch Rail Shear Test,
2016
California Polytechnic State University, San Luis Obispo
Shear Strength Of Carbon Fiber/Epoxy Hinges Using The V-Notch Rail Shear Test, Calvin Noetzel
Materials Engineering
The mechanical properties of carbon fiber reinforced polymer (CFRP) hinges produced by Common Fibers (Kent, Washington) are a new technology with uncharacterized mechanical properties. Currently, Common Fiber’s hinges are utilized in wallets, but in order to expand the application of the hinges to structural components, complete characterization of the mechanical properties of the hinges is necessary. To address this problem, hinges developed by Common Fibers were tested utilizing the V-Notch rail shear test, ASTM D7078, to determine the shear strength of the hinges. Two layups, [+45/-45/0]s and [0/+45/-45/0]s were produced by Common Fibers for the experiment. Hinged and …
Reducing Food And Packaging Waste Through Developing Edible Fruit Based Packaging Prototypes,
2016
California Polytechnic State University, San Luis Obispo
Reducing Food And Packaging Waste Through Developing Edible Fruit Based Packaging Prototypes, Melanie Thatcher
Materials Engineering
Packaging is used to contain, preserve, protect, and advertise both manufactured and natural products. In 2013 it was reported that over thirty percent of solid waste in the United States was from packaging. One way to reduce the impact of packaging on the environment is to create a solution that is edible and sourced from a waste or secondary food product that is not currently being utilized. Food-contact packaging made from recycled materials must meet strict U.S. Food and Drug Administration (FDA) regulations to be utilized as raw material for packaging. Fruit pomace is a candidate material since it may …
Investigation Of Outlife Time On The Environmental Durability Of P2-Etched, Adhesively-Bonded Aluminum Alloys Using The Astm Wedge Test,
2016
California Polytechnic State University, San Luis Obispo
Investigation Of Outlife Time On The Environmental Durability Of P2-Etched, Adhesively-Bonded Aluminum Alloys Using The Astm Wedge Test, Daniel Gross, Corey Sutton
Materials Engineering
P2 etchant is an environmentally-friendly aluminum etchant which has the potential to replace the Forest Products Laboratory (FPL) etchant as the industry standard. Environmental durability of adhesively-bonded aluminum surfaces etched using a paste version of the P2 etchant were tested using the Boeing-developed wedge test (ASTM D3762 - 03(2010)). This project specifically aimed to examine the relationship between outlife time (the time between etching and adhering) and the ability of bonded aluminum samples to pass the wedge test. Two aluminum alloys, 2024-T3 and 7075-T6, were wedge tested and the etched surfaces examined with an atomic force microscope (AFM) and a …
Improving Surface Roughness Of Optically Telegraphed Composite Laminations,
2016
California Polytechnic State University, San Luis Obispo
Improving Surface Roughness Of Optically Telegraphed Composite Laminations, Michael Smith
Materials Engineering
In collaboration with Watson Furniture, this project seeks to identify the cause of surface roughness on composite panels processed into commercial furnishings. The surface roughness was examined and measured using an optical microscope, a scanning electron microscope (SEM), and a profilometer. The SEM and optical microscope provided qualitative data on the surface roughness as well as the film build of each layer. After an initial characterization of the manufactured samples provided by Watson Furniture, additional samples were fabricated for testing using different manufacturing processes than those used by Watson Furniture. These samples were constructed in-house using raw materials provided by …
Life Cycle Assessment Of Paper Versus Electronic Assignment Submission In Cal Poly's Materials Engineering,
2016
California Polytechnic State University, San Luis Obispo
Life Cycle Assessment Of Paper Versus Electronic Assignment Submission In Cal Poly's Materials Engineering, Patrick Mcdonnal
Materials Engineering
Both hard and soft copy submission of assignments make an impact on the environment to produce the final product in terms of energy consumption and carbon emissions; an investigation was conducted as to which method is less environmentally impactful. Student disposition towards each assignment submission method was also investigated because it is associated with learning efficacy. A survey was conducted in Cal Poly’s Materials Engineering Department to determine the contributing components to the environmental impact of paper and electronic assignments, as well as the students’ disposition towards each of them. Contributing components are man-made products used by a student to …
Life Cycle Assessment And Comparison Of Magnesium Oxide Nanoparticles Prepared By Aqueous And Microwave Synthesis Methods,
2016
California Polytechnic State University, San Luis Obispo
Life Cycle Assessment And Comparison Of Magnesium Oxide Nanoparticles Prepared By Aqueous And Microwave Synthesis Methods, Jesse Cartland
Materials Engineering
Abstract: Magnesium oxide nanoparticles are being used increasingly as catalysts for organic synthesis, fuel oil additives, and CO2 adsorbents. There are many ways to produce magnesium oxide nanoparticles, but there is little information available regarding the environmental costs of production. As demand for environmentally friendly materials increases, it is important to understand environmental impact differences between various production methods. This study will compare the differences in embodied energy and global warming potential (GWP) between two synthesis methods: microwave combustion synthesis (microwave synthesis) and oxidation of magnesium hydroxide (aqueous synthesis). The resulting nanoparticles were characterized using scanning electron microscopy (SEM), …
Metals Additive Manufacturing Powder Aging Characterization,
2016
California Polytechnic State University, San Luis Obispo
Metals Additive Manufacturing Powder Aging Characterization, Thomas Russell Lovejoy, Nicholas Karl Muetterties, David Takeo Otsu
Mechanical Engineering
The metallic additive manufacturing process known as selective laser melting requires highly spherical, normally distributed powder with diameters in the range of 10 to 50 microns. Previous observations have shown a degradation in powder quality over time, resulting in unwanted characteristics in the final printed parts. 21-6-9 stainless steel powder was used to fabricate test parts, with leftover powder recycled back into the machine. Powder samples and test specimens were characterized to observe changes across build cycles. Few changes were observed in the physical and mechanical properties of the specimens, however, there were indications of chemical changes across cycles. Potential …
Manipulation Of Surface Plasmon Resonance In Metal And Alloy Thin Films Using Dielectric Media,
2016
Rose-Hulman Institute of Technology
Manipulation Of Surface Plasmon Resonance In Metal And Alloy Thin Films Using Dielectric Media, Benjamin Dubray Hall
Graduate Theses - Physics and Optical Engineering
Surface plasmon polaritons are coherent electron oscillations that propagate along an interface between a Drude metal and a dielectric medium. The excitation of polaritons is highly dependent on the dielectric properties of the metal, the thickness of the metal, and the optical properties of the dielectric material. First, plasmonic activity is assessed for several thicknesses of silver and nickel chromium under He-Ne incidence. Relationships between film thickness and metal dielectric function are explored in both cases. To manipulate the plasmonic activity at the silver surfaces, two methods are explored. Silver oxide was grown on the surface of the silver films, …
