Non-Toxic Soil Thickeners For Reducing Mudslide Intensity,
2020
California Polytechnic State University, San Luis Obispo
Non-Toxic Soil Thickeners For Reducing Mudslide Intensity, Mitchell William Jensen
Materials Engineering
This project was intended to be a continuation of senior project work done last year by a group consisting of two Materials Engineering students and a Soil Science student. Their report was crucial in identifying a range of food thickeners that could be capable of performing in the mud thickening application. All thickeners that were chosen both this year and last year are biocompatible, to alleviate some toxicity concerns. The food thickeners all belong to a class of compounds known as colloids. Since water is the fluid being thickened, these compounds are more accurately referred to as hydrocolloids. Hydrocolloids are …
Pitting Corrosion Of Oerlikon’S Abrasion Resistant Ferritic Stainless Steels,
2020
California Polytechnic State University, San Luis Obispo
Pitting Corrosion Of Oerlikon’S Abrasion Resistant Ferritic Stainless Steels, Matthew P. Nalty, Emma Wagstaff
Materials Engineering
Existing hardfacing coatings for hydraulic cylinders and brake disc applications crack during use leaving the components susceptible to corrosion. To address this problem, Oerlikon has designed three new alloys to be abrasion and corrosion resistant. This paper reviews the literature necessary to understand and quantify pitting resistance of stainless-steel alloys. It documents one round of testing ASTM G48 method A: Ferric Chloride Pitting Test of Stainless Steels on the new alloys P72-X9, P72-X13, P129-X9, as well as samples of 431, 316, and 2205 stainless steels. This paper also discusses improvements to the G48 testing method and industry use of the …
Investigation Of Ceramic Firing Processes For Investment Casting Shell Molds,
2020
California Polytechnic State University, San Luis Obispo
Investigation Of Ceramic Firing Processes For Investment Casting Shell Molds, Leonardo Ken Hoaakua Nakamura, Rileigh Anne Cotter
Materials Engineering
PCC Structurals aims to improve the quality and consistency of their ceramic mold production for their investment casting processes to decrease product loss figures. Although their current production processes result in acceptable quantities of high-quality molds, a significant percentage of defective molds are produced. These defective molds cause appreciable product loss due to casting defects and mold failure. Available literature dictates that high-quality investment casting molds must exhibit fracture strengths within a desired range in order to perform adequately. However, information regarding specific firing procedures which consistently result in ceramic mold strengths within this range is not readily available. To …
Alternative To Custom 450© Stainless Steel For Use In Investment Cast Golf Club Heads,
2020
California Polytechnic State University, San Luis Obispo
Alternative To Custom 450© Stainless Steel For Use In Investment Cast Golf Club Heads, William Henry Armstrong Iv, Davis Martin Loen
Materials Engineering
This investigation seeks to improve on the mechanical property of yield strength, while maintaining 10% elongation prior to fracture observed with of Custom 450 stainless steel in an air-melted investment casting operation. Improving this performance includes an additional heat treatment step of homogenization, as well as replacing the alloy. After identifying and downselecting available high strength stainless steels, a trial of Custom 455 stainless steel is recommended due to its high strength compared to the other alternative alloys. A trial has been developed to analyze the effect air melting has on the chemical composition and mechanical properties of Custom 455 …
Failure Analysis Of Investment Cast Near-Alpha Titanium Alloys,
2020
California Polytechnic State University, San Luis Obispo
Failure Analysis Of Investment Cast Near-Alpha Titanium Alloys, Garrett Ryan Bader, Jonathan Anton Linquist
Materials Engineering
In this project, fracture surfaces of three titanium investment castings were studied as part of a failure analysis on a TaylorMade metalwood. The crack formation occurred between investment cast Ti 9-1-1 and rolled Ti 6-4 joined by laser beam welding. The microstructure of the Ti 9-1-1 contained alpha colonies in large prior beta grains, while the Ti 6-4 was primarily Widmanstätten in basket weave morphology, refined with subsequent rolling. Over a period of cyclic loading, cracking occurred at the face-sole transition in the metalwoods that had been cast from a certain supplier B, while metalwoods that had undergone similar treatment …
Effects Of Surface Finish On High Cycle Fatigue Of Inconel 718,
2020
California Polytechnic State University, San Luis Obispo
Effects Of Surface Finish On High Cycle Fatigue Of Inconel 718, Jessica A. Mcroskey, Matthew Busse
Materials Engineering
Inconel 718 is a nickel-based superalloy and commonly used rocket engine material due to its excellent properties at elevated temperatures. Its fatigue life relies heavily on the surface roughness, as fatigue introduces and propagates cracks at the surface. Part standards set by Aerojet Rocketdyne typically necessitate surface roughness values from 64 to 125 Ra. However, surface topography and residual stresses incurred from the finishing process also affect the fatigue performance. The specific goal of the project is to perform a literature review and write experimental methods to determine how the surface roughness, topography, and residual stresses from turning, grit blasting, …
The Influence Of Time And Temperature On 7781 Prepreg Outside Storage,
2020
California Polytechnic State University, San Luis Obispo
The Influence Of Time And Temperature On 7781 Prepreg Outside Storage, Matthew L. Fuentez, Edwin Stuart Ross Viii
Materials Engineering
Investigation into the issue of out of specification flow data revealed that unregulated transportation conditions exposed 7781 prepreg with phenolic resin to temperature fluctuations up to 125°F. The temperature fluctuations have the potential to advance unwanted curing in the prepreg, making it unsuitable for manufacturing. However, this explanation does not account for the prepreg exceeding specifications above the upper limit. Another explanation was investigated that involved exposure to moisture. Moisture could be preventing curing from taking place and thus resulting in higher flow values. Data collection was unable to proceed past the preliminary stages due to the COVID-19 pandemic and …
Study Of Permeability Testing Methods For Composite Laminates,
2020
California Polytechnic State University, San Luis Obispo
Study Of Permeability Testing Methods For Composite Laminates, Thomas S. Busse, Giannina Marie M. Yu
Materials Engineering
Permeability measurements are strong indicators of the effectiveness of evacuation channels within a composite prepreg. The effectiveness of these evacuation channels directly relates to the void content within a processed composite laminate. The goal of Toray Advanced Composites was to compare two permeability tests and determine which one was more reliable, accurate, and economical. The first permeability test method was the Cirrus method, designed by Cirrus Aircraft, a customer of Toray Advanced Composites. The second test was ASTM D8132, the standard method for permeability testing. Additionally, Toray sought to investigate the effect out-time had on the permeability of three different …
Optimization And Longevity Of Functionalized Multi-Walled Carbon Nanotube-Enabled Membranes For Water Treatment,
2020
California Polytechnic State University, San Luis Obispo
Optimization And Longevity Of Functionalized Multi-Walled Carbon Nanotube-Enabled Membranes For Water Treatment, Madeleine Michael Isabella White
Master's Theses
Water scarcity is a growing concern at the global scale. Large scale water reuse is growing both in necessity and popularity. Before water reuse can be performed efficiently on a large scale or be used for potable supply, even indirectly, contaminants of emerging concern (CECs) will need to be treated at the full scale. Advanced oxidation processes (AOPs) are a form of advanced water treatment capable of treating a wide range of CECs. This study contributes to the growing field of AOPs and more specifically AOPs using ozone combined with functionalized multi-walled carbon nanotubes (MWCNTs). Ozonation of MWCNTs has been …
Synthesis And Fabrication Of Polyaniline/Eggshell Composite In Ammonia Detection,
2020
Chulalongkorn University
Synthesis And Fabrication Of Polyaniline/Eggshell Composite In Ammonia Detection, Nurul Aqilla Mazlan, Jamil M. Sapari, Kavirajaa Pandian Sambasevam
Journal of Metals, Materials and Minerals
This study focuses on the measurement and performance of bio-filler composite based on polyaniline (PANI)/chicken eggshell (CES). The composite films were prepared via ex-situ polymerisation using DBSA as its dopant. The PANI solution was distributed equally before mixing it with three different ratios of CES powder. Characterisations of the composite films were analysed using Fourier-transform infrared spectroscopy (FTIR) and Ultraviolet-visible spectroscopy (UV-Vis), Scanning electron microscope/energy dispersive x-ray (SEM/EDX) and multimeter. PANI film that contained 20mg CES filler possessed the highest conductivity and the fastest time to achieve 90% of sensitivity. The film was also very selective towards ammonia gas and …
Tribology, Mechanical Properties And Coloration Of A Mica Glass-Ceramic,
2020
Chulalongkorn University
Tribology, Mechanical Properties And Coloration Of A Mica Glass-Ceramic, Sahadsaya Prasertwong, Sukanda Angkulpipat, Thapanee Srichumpong, Kallaya Suputtamongkol, Chanchana Thanachayanont, Ramona Sola4, Greg Heness, Cristina Leonelli, Duangrudee Chaysuwan
Journal of Metals, Materials and Minerals
The research employed pigments, Fe2O3 and CeO2, into the glass frit for adjustable mechanical properties and coloration. Disc samples were prepared to determine microstructures and mechanical properties in terms of tribology and nano-indentation hardness as well as biaxial flexural strength. The glass system presented the crystalline phases, by XRD, of phlogopite Ca-mica, fluorapatite, stishovite, anorthite and strontium apatite. Furthermore, SEM micrographs revealed rod-like microstructures and parent glass phase in all specimens 1) GC, 2) GC + 1wt% CeO2, 3) GC + 0.1wt% Fe2O3 and 4) GC + 1wt% CeO2 + 0.1wt% Fe2O3. For the tribology test, specimens were tested by …
Dry-Sliding Wear Of The 316l/H-Bn Composites Produced Under Crack Ammonia Atmosphere,
2020
Chulalongkorn University
Dry-Sliding Wear Of The 316l/H-Bn Composites Produced Under Crack Ammonia Atmosphere, Ekkarat Chusong, Panya Kansuwan, Naoto Ohtake, Pongsak Wila, Nattaya Tosangthum, Ruangdaj Tongsri
Journal of Metals, Materials and Minerals
Wear is one of different problems in mechanical failures of moving components. When a component encounters friction force on its surface, crack initiation tends to occur and wear follows crack propagation. Thus, the moving parts of automobiles should have proper wear resistance for long-time services, in addition to having high strength and hardness for heavy load operation. A self-lubricating material with compromised tribological and mechanical properties is important for some moving components. In this work, self-lubricating composites, metal matrix composites embedded with a solid lubricant, made from 316L stainless steel powder mixed with different hexagonal boron nitride (h-BN) contents of …
Prediction Of Flotation Efficiency Of Metal Sulfides Using An Original Hybrid Machine Learning Model,
2020
Missouri University of Science and Technology
Prediction Of Flotation Efficiency Of Metal Sulfides Using An Original Hybrid Machine Learning Model, Rachel Cook, Keitumetse Cathrine Monyake, Muhammad Badar Hayat, Aditya Kumar, Lana Alagha
Materials Science and Engineering Faculty Research & Creative Works
Froth flotation process is extensively used for selective separation of base metal sulfides from uneconomic mineral resources. Reliable prediction of process outcomes (metal recovery and grade) is vital to ensure peak performance. This work employs an innovative hybrid machine learning (ML) model—constructed by combining the random forest model and the firefly algorithm—to predict froth flotation efficiency of galena and chalcopyrite in relation to various experimental process parameters. The hybrid model's prediction performance was rigorously evaluated and compared against four different standalone ML models. The outcomes of this study illustrate that the hybrid ML model has the prediction ability to process …
Thermal Properties Of Sodium Borosilicate Glasses As A Function Of Sulfur Content,
2020
Missouri University of Science and Technology
Thermal Properties Of Sodium Borosilicate Glasses As A Function Of Sulfur Content, Jason M. Lonergan, Charmayne Lonergan, Joshua Silverstein, Pornsinee Cholsaipant, John Mccloy
Materials Science and Engineering Faculty Research & Creative Works
Sulfur trioxide (SO3) additions, up to 3.0 mass%, were systematically investigated for effects on the physical properties of sodium borosilicate glass melted in air, with a sulfur-free composition of 50SiO2–10Al2O3–12B2O3–21Na2O–7CaO (mass%). Solubility measurements, using electron microscopy chemical analysis, determined the maximum loading to be ~1.2 mass% SO3. It was found that measured sulfur (here as sulfate) additions up to 1.18 mass% increased the glass transition temperature by 3%, thermal diffusivity by 11%, heat capacity by 10%, and thermal conductivity by 20%, and decreased the …
The Effect Of Distal Core Flattening And Heat Treatment On 304 Stainless Steel Guide Wires,
2020
California Polytechnic State University, San Luis Obispo
The Effect Of Distal Core Flattening And Heat Treatment On 304 Stainless Steel Guide Wires, Andrew Spencer Yap, Bryce Eric Veit, Matthew Frederick Lopez Villena
Materials Engineering
The mechanical response of 304 stainless steel guide wires due to different temper conditions and amounts of flattening is to be explored in this project. For this specific project, there is no public literature on the mechanical properties of guide wires with the above conditions through tensile testing or Turns to Failure Testing. To address this, the project with Abbott Vascular will measure the mechanical properties of guide wires using the aforementioned factors. Due to a lack of previous literature on this research topic, there are no quantitative goals for the project, however, any new research compiled in this area …
Miniaturized Ultraviolet Imager Phase Iii,
2020
California Polytechnic State University, San Luis Obispo
Miniaturized Ultraviolet Imager Phase Iii, Bradley D. Albright, Nicolas A. Armenta, Colin W. Harrop
Mechanical Engineering
This document details the work to date, June 9, 2020, done by the Cal Poly Mechanical Engineering senior project team, Miniaturized Ultraviolet Imager: Phase III (MUVI III), sponsored by the University of California, Berkeley – Space Sciences Laboratory (UCB SSL). MUVI III is the third senior project team of an ongoing design, MUVI: the prototype of a 2U sized CubeSat intended to capture aurora images in the ionosphere. The first team, MUVI I, finished development of the UV imager. The second team, MUVI II, designed the mirror mounting and deployable door mechanisms. The goal of MUVI phase III is to …
Mechanical Properties Of Boehmeria Nivea Natural Fabric Reinforced Epoxy Matrix Composite Prepared By Vacuum-Assisted Resin Infusion Molding,
2020
Military Institute of Engineering (IME)
Mechanical Properties Of Boehmeria Nivea Natural Fabric Reinforced Epoxy Matrix Composite Prepared By Vacuum-Assisted Resin Infusion Molding, Fabio Da Costa Garcia Filho, Fernanda Santos Da Luz, Lucio Fabio Cassiano Nascimento, Kestur Gundappa Satyanarayana, Jaroslaw W. Drelich, Sergio Neves Monteiro
Michigan Tech Publications, Part 1
Natural lignocellulosic fibers and corresponding fabrics have been gaining notoriety in recent decades as reinforcement options for polymer matrices associated with industrially applied composites. These natural fibers and fabrics exhibit competitive properties when compared with some synthetics such as glass fiber. In particular, the use of fabrics made from natural fibers might be considered a more ecient alternative, since they provide multidirectional reinforcement and allow the introduction of a larger volume fraction of fibers in the composite. In this context, it is important to understand the mechanical performance of natural fabric composites as a basic condition to ensure ecient engineering …
Effects Of New And Recycle Flux On The Mechanical Properties Of Submerged Arc Welded (Saw) Line Pipe Grade X52m And X65m,
2020
Universiti Malaya
Effects Of New And Recycle Flux On The Mechanical Properties Of Submerged Arc Welded (Saw) Line Pipe Grade X52m And X65m, Taib Meor Mohd Adli
Student Works (2020-2029)
Two line pipe grade X52M and X65M were manufactured using submerged arc welding process. For each grade, two different welding flux condition were simulated, i.e. 100% new flux and 100% recycle flux. The flux used was aluminate basic type trade name OP 132. The outside diameter and wall thickness for X52M was 610mm x 12.7mm and for X65M was 762mm x 14.3mm. Lower weld re-entrant angle and higher weld bead height were observed in recycle flux condition. Lower weld manganese content recorded in recycle flux condition. And lower mechanical tests (i.e. tensile, impact, and hardness) value reported for recycle flux …
Synthesis And Characterization Of Porous Carbon Composite Derived From Biomass Waste For Supercapacitor Application,
2020
Universiti Malaya
Synthesis And Characterization Of Porous Carbon Composite Derived From Biomass Waste For Supercapacitor Application, Cheng Kim Sim
Student Works (2020-2029)
Energy storage devices have gradually dominated human daily activities and indispensable to economy development such as supercapacitor and battery. There are few factors determining the performance of supercapacitor and active material is one of the crucial. Therefore, biomass such as pineapple peel (PP) and green waste (GW) were preferred and prior mixed with manganese and tin carbonate to synthesize carbon composite (PP/GW-ZMO and PP/GW-ZTO) via combustion. Brunauer–Emmett–Teller (BET) was employed to study the textural properties with the highest specific surface area obtained in PP-C (1765.92 m2g-1) and GW-C (1613.92 m2g-1). The existence of composite materials was examined using x-ray diffraction …
Nature-Inspired Electrode Materials For Next Generation Sustainable Energy Storage,
2020
CUNY Graduate Center
Nature-Inspired Electrode Materials For Next Generation Sustainable Energy Storage, Mikhail Miroshnikov
Dissertations, Theses, and Capstone Projects
Despite revolutionizing the world of portable electronics, the contemporary lithium-ion battery (LIB) suffers from challenges associated with the cost, safety, and environmental impact of transition metal oxide-based intercalation cathodes. To alleviate these issues, naturally occurring organic molecules may serve as sustainable alternatives to traditional inorganic cathode materials. The electrochemical properties of organic compounds are derived from redox-active functional groups containing oxygen, nitrogen and sulfur. Additionally, these functional groups are capable of coordinating metal ions beyond lithium, allowing for compatibility with sodium-ion batteries (SIBs) and other earth abundant metal-based energy storage systems. However, despite competitive performance against commercialized cathode materials, much …
