Implementation Of Multivariate Artificial Neural Networks Coupled With Genetic Algorithms For The Multi-Objective Property Prediction And Optimization Of Emulsion Polymers,
2019
California Polytechnic State University, San Luis Obispo
Implementation Of Multivariate Artificial Neural Networks Coupled With Genetic Algorithms For The Multi-Objective Property Prediction And Optimization Of Emulsion Polymers, David Chisholm
Master's Theses
Machine learning has been gaining popularity over the past few decades as computers have become more advanced. On a fundamental level, machine learning consists of the use of computerized statistical methods to analyze data and discover trends that may not have been obvious or otherwise observable previously. These trends can then be used to make predictions on new data and explore entirely new design spaces. Methods vary from simple linear regression to highly complex neural networks, but the end goal is similar. The application of these methods to material property prediction and new material discovery has been of high interest …
Processing Of Aluminum Foam Using A Double Replication Process,
2019
Institut polytechnique de Grenoble
Processing Of Aluminum Foam Using A Double Replication Process, Luc Salvo, Sevara Mukhtarova
Acta of Turin Polytechnic University in Tashkent
The purpose of this paper is to look at the impact of small morphological variations on kinetic storage of infiltrated open-cell foams. For this a new production process was studied, and a general description of the process and its variants are given.
Compositional Optimization Of Amyloid-Graphene Oxide Nanohybrids For Biomaterials,
2019
California Polytechnic State University, San Luis Obispo
Compositional Optimization Of Amyloid-Graphene Oxide Nanohybrids For Biomaterials, Claire L. Drewery
Materials Engineering
Amyloid nanofibrils are natural materials capable of self-assembling into precise structures with tunable functionalities, while exhibiting excellent mechanical properties. In combination with highly conductive graphene oxide (GO), the 1-D amyloid nanofibrils and 2-D nanosheets of GO can produce a robust and bio-functional nanohybrid, hypothesized to exhibit multi-domain functional properties useful for enzyme sensing, water purification, drug delivery, and tissue scaffolding applications. Here, we examine the properties of an amyloid-graphene oxide nanohybrid film made with amyloids derived from hen egg white lysozymes in an attempt to explore the diverse toolbox of amyloid derivatives and establish ideal fabrication methods and formulations of …
Surface Engineering Of Annealed High Entropy Alloys Towards Thermodynamically Stable, Anti-Oxidation, Solar Selective Absorbers,
2019
Dartmouth College
Surface Engineering Of Annealed High Entropy Alloys Towards Thermodynamically Stable, Anti-Oxidation, Solar Selective Absorbers, Sheppard R. Somers
ENGS 88 Honors Thesis (AB Students)
Concentrating solar power (CSP) systems require receivers that maintain their physical properties at the high operating temperature and are absorbent. The high entropy alloy Fe28.2Ni18.8Mn32.9Al14.1Cr6 (HEA) investigated in this thesis fills these needs by harnessing the HEA’s oxidation process to create a selective solar absorbing layer that grows at a parabolic rate at CSP operating temperatures. Results of this research demonstrate that annealing processes of HEA can yield over 90% solar thermal efficiency by engineering the surface oxidation to be both physically and optically optimized for absorption.
Nano-Enhanced Composite Membranes For Water Desalination,
2019
California Polytechnic State University, San Luis Obispo
Nano-Enhanced Composite Membranes For Water Desalination, Benjamin Fredrik Victor Sundling Von Fürstenrecht
Materials Engineering
In theory single walled carbon nanotubes (SWCNT) will aid in ion rejection due hydrophobicity and smoothness of the SWCNT. An efficient means of water desalination utilizing SWCNT in a membrane seems plausible. A lyotropic liquid crystal (LLC) solution was made with a synthesized polymerizable surfactant methacryloxy ethyl hexadecyl dimethyl ammonium bromide (C16MA) to help with vertical alignment of SWCNT. Due to SWCNT lack of solubility and tendency to agglomerate in water, a dispersion performed using an inert surfactant centrimonium bromide (CTAB) to make sure that the SWCNT were homogeneously dispersed in the solution without altering the hexagonal packing factor of …
Investigation Of Copper Infiltration Alloys For Use In Metal Matrix Composite Drill Bits,
2019
California Polytechnic State University, San Luis Obispo
Investigation Of Copper Infiltration Alloys For Use In Metal Matrix Composite Drill Bits, Samuel J. Stueland, Timothy P. Markiewicz
Materials Engineering
A newly developed copper-based alloy, P98-X1 was tested for compressive strength to predict qualitative performance compared to MF53, F-Bronze, CuNiSn, and CuMnNi for use as the infiltration alloy in metal matrix composite (MMC) drill bits. Ingots of each alloy were cast using an arc furnace and cut into compression testing samples using wire electrical discharge machining (EDM). The alloys were selected for testing based on solid solution strengthening coefficient and melting point. Five of each alloy were compression tested to determine yield strength of the infiltration alloy. Yield strength was determined using a 0.002mm displacement offset from the linear elastic …
Effects Of Heat Treatment On The Dimensional Stability And Mechanical Properties Of Guadua Bamboo,
2019
California Polytechnic State University, San Luis Obispo
Effects Of Heat Treatment On The Dimensional Stability And Mechanical Properties Of Guadua Bamboo, Kade Schmitz, Skye Dascher, Shalto Dascher
Materials Engineering
Contributing to about 4% of particulate emissions, the construction industry is one of the largest polluters of the environment. In an effort to reduce emissions, BamCore has produced a dual panel wall system made of Guadua bamboo with a Douglas fir veneer. Bamboo is a highly renewable material with a fast growth rate and carbon sequestration abilities. This project investigates how heat treating Guadua bamboo influences its dimensional changes and mechanical properties for building applications. It was found that a dimensional increase in every direction occurred for all samples when exposed to higher relative humidity (50% to 90%), and that …
A Study And Simulation Of Flux Induced Corrosion In Copper Tubing Used For The Distribution Of Potable Water,
2019
California Polytechnic State University, San Luis Obispo
A Study And Simulation Of Flux Induced Corrosion In Copper Tubing Used For The Distribution Of Potable Water, Daniel O. Benham
Materials Engineering
Water side corrosion within copper plumbing can occur due to a wide variety of unwanted circumstances. Through the controlled immersion of six ¾” copper tubing samples with five utilizing a unique industry standard soldering flux, this investigation associates residual flux deposits with the initiation of pitting in copper. Water stagnation in a copper potable water distribution system, typically associated with an infrequently used faucet, is a condition highly prone to copper pitting. A test apparatus designed to produce a partially stagnant flow condition with scheduled electrolyte flushes every 3 days was developed and constructed to contain 6 test samples for …
The Impact Of Preheat On 2205 Duplex Stainless Steel Welds,
2019
California Polytechnic State University, San Luis Obispo
The Impact Of Preheat On 2205 Duplex Stainless Steel Welds, Angelee G. Q. Breuninger, Iris I. Li, Cristian V. Sion
Materials Engineering
The goal of this project is to determine the relationship between preheat temperature and phase balance of austenite and ferrite in the heat affected zone (HAZ) of a dissimilar thickness weld made of Sandvik SAF 2205 duplex stainless steel (DSS). Various preheat temperatures were applied (no preheat, 63°C, 98 °C, 141 °C, 181 °C, and 214 °C) to a 2-inch thick plate that was welded to a 0.072-inch thin sheet, with a 0.125-inch standoff, using manual gas tungsten arc welding (GTAW). Welding variables (voltage, amperage, and travel speed) were recorded and thermocouples were placed along the backside of the weld, …
Investigation Of The Encapsulation Efficiency Of Hexanal In Y-Cyclodextrin Metal Organic Frameworks,
2019
California Polytechnic State University, San Luis Obispo
Investigation Of The Encapsulation Efficiency Of Hexanal In Y-Cyclodextrin Metal Organic Frameworks, Travis J. Lang
Materials Engineering
Nanoporous materials have been extensively studied for applications such as drug delivery and organic compound storage. The nanoporous material of this study is a metal organic framework (MOF) which is a coordination of metal ions with organic binders. The structure created by this coordination can be used to absorb organic compounds, such as plant growth regulators, and subsequently release the organic compounds over a prolonged period to extend the storage life of foods. This study is examining the encapsulation efficiency of hexanal in γ-cyclodextrin metal organic frameworks (γ-CDMOFs) as a mechanism for potential active packaging applications. γ-CDMOFs were synthesized by …
Moisture Characterization Of Thermoplastics And Thermosets For Use As Matrices In Fiber Reinforced Composites,
2019
California Polytechnic State University, San Luis Obispo
Moisture Characterization Of Thermoplastics And Thermosets For Use As Matrices In Fiber Reinforced Composites, Kieran Hook, Ray Hsu
Materials Engineering
Epoxy matrix composites are widely used in aerospace industry for lighter aircraft while thermoplastic-matrix composites have traditionally been underutilized despite their excellent fracture resistance, impact strength, and the ability to be recycled. Toray Advanced Composites (Morgan Hill, CA) wants to investigate the structural integrity of thermoplastic matrices in common aircraft operating environments. An experiment was conducted to observe the effect of moisture absorption on thermoplastic composites’ mechanical strength. PEEK, PPS, and PEI matrices were compared to an epoxy matrix in this experiment. Samples were submerged in 160ºF distilled water to accelerate moisture absorption. For two months, the changes in mass …
Microstructural Transformation Of Cold-Sprayed Grcop-42 For Rocket Engine Combustion Chamber Liners,
2019
California Polytechnic State University, San Luis Obispo
Microstructural Transformation Of Cold-Sprayed Grcop-42 For Rocket Engine Combustion Chamber Liners, Mason Souther
Materials Engineering
Rocket engines have always relied on high-conductivity copper liners to protect structural components from extreme thermal loads produced by combustion. Forged NARloy-Z has been the material of choice for decades but increasing cost of its constituent silver and high waste in the machining process has reduced the alloy’s cost effectiveness. Aerojet Rocketdyne wants to determine the viability of cold-spray additively manufactured GRCop-42 as a replacement alloy to reduce liner cost. Screening tests were performed to observe the microstructural development and microhardness changes of cold-sprayed GRCop-42 after being subjected to multiple stages of the typical heat treatment of a combustion chamber …
Investment Cast C450 Microstructural Characterization In Golf Club Heads,
2019
California Polytechnic State University, San Luis Obispo
Investment Cast C450 Microstructural Characterization In Golf Club Heads, Kenneth Yin-Fai Lau
Materials Engineering
Two types of tensile bars were observed in this study of golf iron heads for TaylorMade Golf. As-cast and as-cast then machined tensile bars. The tensile bars underwent tensile tests to observe tensile strength, percent elongation, and fracture mechanisms. Furthermore, the hardness of the tensile bars was also taken despite seeing no difference in sample types. However, the as-cast samples did not consistently meet the requirements of percent elongation > 10.00% as there was a sample with 0.00% and another with 1.26%. These samples also showed brittle fracture, instead of the desired cup-and- cone ductile fracture. To investigate further, transverse sections …
Minimizing The Dimensional Change In Two Component Epoxy Based Thermoset Adhesives Through Adapting Mix Ratio And Initial Crosslink Density,
2019
California Polytechnic State University, San Luis Obispo
Minimizing The Dimensional Change In Two Component Epoxy Based Thermoset Adhesives Through Adapting Mix Ratio And Initial Crosslink Density, Jefferson Peter Norman
Materials Engineering
Meissner Filtration uses amine-hardened epoxy as a high-performance adhesive to encapsulate hollow fiber membranes at the ends of rigid filter housings. Dimensional change of the epoxy while curing can result in residual stress formation that is detrimental to the manufacturing of the filter and causes structural integrity issues when the filter is used in industrial processes where heating and cooling cycles are implemented. The residual stresses can cause cracks, microscopic fractures, and delamination from the housing, resulting in failure of the filter. The goal of this project was to evaluate how changes in processing conditions could minimize dimensional variability due …
Non-Toxic Soil Thickeners For Reducing Mudslide Intensity,
2019
California Polytechnic State University, San Luis Obispo
Non-Toxic Soil Thickeners For Reducing Mudslide Intensity, Miranda Miao, Isaac Blackburn, Erika Haley Yao
Materials Engineering
Non-toxic food thickeners were investigated as a solution for thickening mud to mitigate the effects of mudslides. All soil was obtained from a site on the California Polytechnic State University campus where a mudslide occurred in 2017. Guar gum was mixed into the soil at 1 wt% and 10 wt% of the moisture content in the soil. Whey protein was mixed into the soil at 2 wt% and 19 wt% of the moisture content in the soil. The soils’ liquid limit was found using the Casagrande cup testing method. Liquid limit testing indicated that thickeners raised the liquid limit, most …
Mechanical Tear Testing And Failure Analysis Of Armordillo® Textile For Future Comparison With Next Generation Replacement Textiles,
2019
California Polytechnic State University, San Luis Obispo
Mechanical Tear Testing And Failure Analysis Of Armordillo® Textile For Future Comparison With Next Generation Replacement Textiles, Jordan Bryce Pohl
Materials Engineering
ArmorDillo® is a heavy-duty, waterproof textile designed to protect valuable equipment against outdoor elements such as rain, dirt, salt, ultraviolet rays, and damage from other external factors that is manufactured by Transhield® USA and is currently in service with many branches of the United States Armed Forces, primarily the United States NAVY. Due to emerging security threats to classified military hardware the US NAVY through the United States Naval Surface Warfare Center (NSWC) is actively researching and sourcing a textile replacement for ArmorDillo® to meet these threats. This study investigates the mechanical durability of ArmorDillo® under …
Photooxidation Of Biopolymers,
2019
California Polytechnic State University, San Luis Obispo
Photooxidation Of Biopolymers, Marlon H. Dieguez
Materials Engineering
The lack of degradation of plastic products have imposed problems in the preservation of natural environments and their ecosystems through plastic accumulation. This collection of plastics promotes toxin exposure to wildlife, finding its way into the food chain, affecting both land and marine ecosystems. The project goal is to understand the degradation mechanisms of biodegradable materials and other comparable materials through UV radiation testing. Polylactide (PLA) films and polycarbonate (PC) films will be compared for their relative deterioration from constant UV radiation in a Q-U-V accelerated weather tester for 28 days. Five 3” by 5” samples of 14 mil thick …
Transient Analysis Of Diffusion-Induced Deformation In A Viscoelastic Electrode,
2019
Fuzhou University, China
Transient Analysis Of Diffusion-Induced Deformation In A Viscoelastic Electrode, Yaohong Suo, Fuqian Yang
Chemical and Materials Engineering Faculty Publications
In this study, we analyze the transient diffuse-induced-deformation of an electrode consisting of the conducting polymer polypyrrole (PPY) by using the theories of linear viscoelasticity and diffusion-induced stress. We consider two constitutive relationships with dependence of viscosity on strain rate: Kelvin-Voigt model and three-parameter solid model. A numerical method is used to solve the problem of one-dimensional, transient diffusion-induced-deformation under potentiostatic operation. The numerical results reveal that the maximum displacement occurs at the free surface and the maximum stress occurs at the fixed end. The inertia term causes the stress to increase at the onset of lithiation. The stress decreases …
Nano Fab Lab 63,
2019
California Polytechnic State University, San Luis Obispo
Nano Fab Lab 63, Brian K. Deemer, Josh Clemons, Nick Brodine, Delaney Fitzsimmons
Mechanical Engineering
Lawrence Livermore National Laboratories (LLNL) has several steps in the production process for ceramic nanofiber tubes that they would like to improve - electrospinning, cutting, rolling, sealing and heat treating. We undertook the challenge to deliver LLNL with a semi-automated process that efficiently integrates the steps of cutting, rolling, and sealing to save time and improve control over end dimensions. In this document, we discuss the technical background of the manufacturing steps currently followed to create nanofiber tubes, identify which steps are incorporated in our prototype and explain how they will interface with one another, define the design requirements, present …
Evaluation Of Tensile Properties For Selective Laser Melted 316l Stainless Steel And The Influence Of Inherent Process Features,
2019
California Polytechnic State University, San Luis Obispo
Evaluation Of Tensile Properties For Selective Laser Melted 316l Stainless Steel And The Influence Of Inherent Process Features, Paul Swartz
Master's Theses
Optimal print parameters for additively manufacturing 316L stainless steel using selective laser melting (SLM) at Cal Poly had previously been identified. In order to further support the viability of the current settings, tensile material characteristics were needed. Furthermore, reliable performance of the as-printed material had to be demonstrated. Any influence on the static performance of parts in the as-printed condition inherent to the SLM manufacturing process itself needed to be identified. Tensile testing was conducted to determine the properties of material in the as-printed condition. So as to have confidence in the experimental results, other investigations were also conducted to …
