Digital Commons Network^™

Tribocorrosion And Metal Release From Austenitic Stainless Steels 304 And 201 In Simulated Cassava Food Contact, Robert Addai, Temitope E. Olowoyo, Thalia E. Standish, Jeffrey Daniel Henderson, Ubong Eduok, Yolanda Hedberg

Chemistry Publications

Cassava is the third most significant calorie source in the tropics. Its processing has changed from traditional methods to stainless steel processing machines. This study investigated the influence of cassava on metal release from two common stainless steels, ASTM 304 and 201, with and without friction, and on tribocorrosion (multianalytically) of 304. Cassava was relatively corrosive and hindered repassivation of the surface oxide of stainless steel, but it also acted as a lubricant against mechanical friction. The combined action of friction and cassava caused a significant increase in iron, chromium, nickel, and manganese release from the stainless steels (30–35- fold …

Finite Element Analysis Of Thermal-Mechanical Instabilities In Nonmetallic Friction Composite Material, Joseph-Shaahu Shaahu

Electronic Theses and Dissertations

Thermal-mechanical instability (TMI) has been a research topic of interest as it focuses a lot on transportation systems. Thermal-mechanical instability was first noticed in railway and experimentally studied with a pin-to-pin or pin-to-surface setup of sliding contact. The topic has been extended into brakes and clutches which are two of the most common sliding systems most susceptible to thermal buckling and thermoelastic instability (TEI), where thermal buckling and thermoelastic instability are two sub-categories of thermal-mechanical instability. Thermal-mechanical instability is an ongoing research to better understand the phenomenon and the limits at which such instability occurs. This work delved into the …

Assessing The Lubrication Performance Of Sunflower Oil Modified With Montmorillonite Clay (Mmt) Nanoparticles For Industrial Applications, Md Mashfiqur Rahman, Md Abu Sayeed Biswas, Laura Peña-Pará, Demófilo Maldonado- Cortés, Javier A. Ortega

Mechanical Engineering Faculty Publications and Presentations

Because of the environmental impact and price volatility, there has been a growing concern about using petroleum-based lubricants. This issue has encouraged research into the development of biodegradable lubricants like vegetable oils. This study assessed the tribological behavior of sunflower oil modified with Montmorillonite nanoclay (MMT) as lubricant additives. A block-on-ring tribometer was used to assess the wear and friction characteristics of the nano-lubricants. A custom-made tapping torque tester was used to evaluate the nano-lubricants in a real-world application. It was found that the volumetric wear, Coefficient of Friction, and torque of the system decreased when MMT nanoparticles were added. …

It's A Match: Shaadi.Com, Tinder, And The Fantasy Of Frictionless-Ness, Purvi Rajpuria

MFA in Illustration & Visual Culture

In this essay I carry out case studies of Shaadi.com and Tinder to unpack the cultural principles underlying the apps that shape our interpersonal relationships today. I demonstrate that these apps are grounded in a fantasy of frictionless-ness, or the desire to shield the self from discomfort caused by external factors, and argue that this is a fraught cultural ideal. My analysis reveals that a fantasy of frictionless-ness gives birth to a cultural landscape of rampant subjectivity and tepid morality, which hampers our ability to form deep and meaningful connections with each other. Recognising the flaws of such a fantasy, …

Improving Tribological Properties Of Polydopamine/Polytetrafluoroethylene Coatings Through Incorporating Core-Shell Nanoparticles And Laser Surface Texturing, Firuze Soltani-Kordshuli

Graduate Theses and Dissertations

Polytetrafluoroethylene (PTFE) is a widely used polymer that has unique properties such as chemical and temperature resistance, corrosion resistance, low maintenance cost, and a very low coefficient of friction (COF). These distinctive properties have made PTFE a promising candidate for industrial applications where surfaces are in relative motion. PTFE can be utilized as a thin film solid lubricant to significantly reduce the friction between moving surfaces. However, PTFE coatings have low cohesion and poor adhesion to the substrate resulting in its low wear resistance. This fact limits the application of PTFE coatings in load-bearing situations. To address these limitations, an …

Vibration Control Of A Two-Story Base-Isolated Building Using A New Tuned Mass Multi-Sliding Friction Damper, Mohsen Amjadian, Syed Muhammad Bilal Haider

Civil Engineering Faculty Publications and Presentations

This paper studies the use of a new Tuned Mass Multi-Sliding Friction Damper (TMMSFD) to increase the damping capacity of seismic isolators installed on a two-story base-isolated building to limit their lateral deformations. The proposed TMMSFD consists of a set of several masses that are laterally attached to the superstructure floor through linear springs. These masses are placed on top of each other one by one and are allowed to slide with respect to each other during the earthquake. The bottom mass that carries the weight of upper masses is in contact with the superstructure floor. The damping of system …

Perspectives Of 2d Mxene Tribology, Andreas Rosenkranz, Maria Clelia Righi, Anirudha V. Sumant, Babak Anasori, Vadym Mochalin

Chemistry Faculty Research & Creative Works

The Large and Rapidly Growing Family of 2D Early Transition Metal Carbides, Nitrides, and Carbonitrides (MXenes) Raises Significant Interest in the Materials Science and Chemistry of Materials Communities. Discovered a Little More Than a Decade Ago, MXenes Have Already Demonstrated Outstanding Potential in Various Applications Ranging from Energy Storage to Biology and Medicine. the Past Two Years Have Witnessed Increased Experimental and Theoretical Efforts toward Studying MXenes' Mechanical and Tribological Properties When Used as Lubricant Additives, Reinforcement Phases in Composites, or Solid Lubricant Coatings. Although Research on the Understanding of the Friction and Wear Performance of MXenes under Dry and …

Magnetic Response Of A Two-Dimensional Viscous Electron Fluid, Aydin Cem Keser, Oleg Sushkov

Turkish Journal of Physics

It has been established that the Coulomb interactions can transform the electron gas into a viscous fluid. This fluid is realized in a number of platforms, including graphene and two-dimensional semiconductor heterostructures. The defining characteristic of the electron fluid is the formation of layers of charge carriers that are in local thermodynamic equilibrium, as in classical fluids. In the presence of nonuniformities, whirlpools and nontrivial flow profiles are formed, which have been directly imaged in recent experiments. In this paper, we theoretically study the response of the electron fluid to localized magnetic fields. We find that the electric current is …

Investigation Of Tribological Performance Of Layered Double Hydroxide Materials, Ly Kiet Tuong Dao

University of Wollongong Thesis Collection 2017+

This research delves into the exploration of layered double hydroxides (LDHs) as potential lubricant additives, aiming to understand their tribological potential and effectiveness in reducing friction and wear. While LDHs have been extensively studied in catalysis, absorbents, and biomedical applications, their tribological potential remains least explored. Some studies suggest LDHs as potential lubricant additives, but tribochemical mechanisms and the effects of specific anions and cations in tribofilm formation are not fully understood. Incorporating LDH lamellar structures with beneficial intercalated species holds a strong promise for significant friction and wear reduction. Although phosphate-based additives demonstrated excellent friction and wear performance, the …

Investigations Into Flange Surface Friction Effects On Shear Stud Load Transfer In Composite Bridge Girders, Callie Clark

Graduate Theses and Dissertations

Composite bridge behavior is commonly achieved through headed shear studs welded tothe steel girder flange and embedded in the concrete deck. Current AASHTO provisions for estimating demands on shear studs during service-level loading consider only bearing load transfer, neglecting adhesion bonding and friction load transfer between the concrete deck and girder flange. Quantifying alternative load transfer mechanisms across the steel-concrete interface may result in improved steel bridge economy by reducing the number of studs required in a composite girder design. This study investigates the effects of flange surface friction (considering various coatings) on resulting stud demands using both experimental testing …

Evaluation Of Damon Psl And Conventional Mbt Brackets In Leveling And Alignment Efficiency, Jacob Beckstrand

Master's Theses (2009 -)

Objective: Ormco has proposed that the low-friction design of their self-ligation brackets allows for more efficient alignment of crowded teeth with less incisor proclination and faster treatment times compared to conventional MBT bracket systems. The purpose of this study is to examine the hypothesis that there is no difference between Damon PSL and conventional MBT brackets in factors related to leveling and alignment in-vitro. Methods:Damon Q2 .022” slot brackets and 3M Unitek .022” slot MBT brackets were bonded to 2 sets of typodont teeth. Typodont teeth were placed into 8 upper and lower Class I crowding wax forms (Kilgore, USA) …

A Methodology For Observing The Deformation Of Rubber Studs When Stepping On A Stone, Robin Compeyron, Jürgen Mitternacht, Veit Senner, Bahador Keshvari, Valentin Wohlgut

International Sports Engineering Association – Engineering of Sport

No abstract provided.

Development Of A Ski Testing Machine Based On The Effective Friction Coefficient For Classic Cross-Country Skis, Alexis Dumas, André Bégin-Drolet, Julien Lépine

International Sports Engineering Association – Engineering of Sport

No abstract provided.

Effect Of Modular Sports Flooring On Static And Dynamic Friction Of Common Sport Shoes, Nicholas Busuttil, Marcus Dunn, John Hale, Alexandra Roberts, Kane Middleton

International Sports Engineering Association – Engineering of Sport

No abstract provided.

Comparing The Friction Of Tennis Shoes, John Hale, Roger Lewis, Matt Carre

International Sports Engineering Association – Engineering of Sport

No abstract provided.

Carbon Nanotori Reinforced Lubricants In Plastic Deformation Processes, Jaime Taha-Tijerina, Juan Manuel Martinez, Daniel Euresti, Patsy Yessenia Arquieta-Guillen

Manufacturing & Industrial Engineering Faculty Publications and Presentations

This research presents the effects of carbon nanotori structures (CNst) dispersed as reinforcement for metal-working and metal-forming lubricants. Synthetic (SL) and deep drawing (DD) nanolubricants were prepared following a two-step method at 0.01 wt.%, 0.05 wt.%, and 0.10 wt.% filler fractions. Slight increases in viscosity (<6%) for nanolubricants were observed as filler fraction was increased through various measured temperatures. Tribological behavior of nanolubricants displayed superb improvements under antiwear and extreme pressure conditions. The load carrying capacity (p_oz) increased by 16% and 22% at merely 0.01 wt.% CNst reinforcement and up to 73% and 107% at 0.10 wt.% filler fraction for SL and DD nanolubricants, respectively, compared to conventional materials. Additionally, at 0.10 wt.% wear scar evaluations showed a highest benefit of 16% and 24%, for SL and DD nanolubricants, …

Políticas Visuales Y Acción Colectiva: Un Investigación Sobre Las Articulaciones Estético-Políticas En Manifestaciones De Arte Público En Ushuaia Y El Bolsón / Visual Politics And Collective Action: An Investigation Of Aesthetic-Political Articulations In Manifestations Of Public Art In Ushuaia And El Bolsón, Laura Woodhouse

Independent Study Project (ISP) Collection

Art in the public sphere is an integral tool of communication that transcends the vertical hierarchies of social organization by infiltrating the popular consciousness with disruptive mediums and reclamations of visual space. Because of the specific accessibility of a variety of forms of public art, for both creators and observers, manifestations of public art have become a popular method through which counter-hegemonic social narratives can be constructed and mediated; in Argentina, a profound history of disruptive art has has been intricately intertwined with an equally rich history of popular activism. With a focus in El Bolsón and Ushuaia, two localities …

Shear Thickening In Dense Bidisperse Suspensions By Dynamic Simulation, Nelya Malbranche

Dissertations and Theses

Shear thickening, which corresponds to an increase of viscosity with shear rate, is ubiquitously observed in many concentrated suspensions and, as such, has implications for many industrial materials and geological phenomena. Controlling shear thickening is of significant importance, and many studies have been devoted to it. Recent works link shear thickening to the shear-induced transition from a lubricated particle interaction at low shear stress to a predominantly frictional interaction at high stress. In this dissertation, we investigate bidispersity and focus on mechanisms contributing to the viscosity evolution in rate-dependent suspensions, something that has not been addressed before. We perform detailed …

Lubrication Performance Of Vegetable Oils Modified With Halloysite Clay Nanotubes (Hnt) As Lubricant Additives, Md Abu Sayeed Biswas

Theses and Dissertations

Vegetable oil-based nano-lubricants are a great alternative to petroleum-based lubricants because of their less adverse impact on the environment. This work evaluates the tribological performance of sunflower, corn, and peanut oils modified with halloysite clay nanotubes (Al2Si2O2(OH)2nH2O) as lubricant additives at different concentrations. To analyze the tribological performance of the nano-lubricants, a block-on-ring tribometer was used following the ASTM G-077-17 standard procedure. Characterization of HNT was carried out by X-Ray Diffraction (XRD), Scanning Electron Microscopy (SEM), and Thermogravimetric Analysis (TGA). The effect of the HNT on the lubrication performance of the newly developed vegetable oil-based nano-lubricants was evaluated, and the …

Development Of Vegetable Oil-Based Nano-Lubricants Using Montmorillonite Clay (Mmt) Nanoparticles As Lubricant Additives, Md Mashfiqur Rahman

Theses and Dissertations

Because of the environmental impact and price volatility, there has been a growing concern on the use of petroleum-based lubricants. This issue has stimulated research into the development of biodegradable lubricants like vegetable oils. In this study, the tribological and rheological behavior of sunflower, peanut, and corn oils modified with Montmorillonite nanoclay (MMT) as lubricant additives were evaluated at various concentrations. A custom-made block on ring tribotester was used to evaluate the wear and friction characteristics of the nano-lubricants, following the ASTM G-077-05 standard. The effects of concentration and shear rate on shear viscosity were studied using a parallel plate …

Protic Ionic Liquids As Neat Lubricants & Lubricant Additives To Nonpolar And Polar Base Oils: Lubricating And Wear Mechanisms Of Sliding Steel-Steel And Aluminum-Steel Contacts, Hong Guo

Theses

Friction and wear are unavoidable problems that affect moving workpieces in all machines, resulting in significant energy and lifespan losses. Researchers have estimated that almost 23% of the world’s total energy consumption is generated from friction and wear in mechanical moving parts. The aforementioned energy loss could be reduced by up to 62% when employing advanced lubricants between the contacting surfaces to increase the durability and efficiency of working components. In the recent decade, ionic liquids have shown great potential as high-performance lubricants and “tailor-made” lubricating additives across different tribological systems due to their unique properties such as nonvolatility, excellent …

Study Of Tribological Properties Of Laser Micro-Texturing Titanium Surfaces Under Lubrication With Protic Ionic Liquids, Junru Pang

Theses

Adding micro textures by laser texturing technology to one or both sliding surfaces of relative motion has been recently studied as an environmentally friendly and efficient way to improve tribological behaviors of metals, including the reduction of friction and wear. Meanwhile, protic ionic liquids are gradually gaining increasing attention as neat lubricants and lubricant additives because of their simple synthetic procedures where the halogen elements can be easily avoided from their molecular components. The eco-friendly protic ionic liquids can be strongly adsorbed on the substrate surfaces to form ordered lubricant films which prevent the rubbing pair from direct contact. Also, …

Securing Pint Glasses On Serving Trays With Magnetic Attachments, Jayden Commendatore

Senior Theses

It is extremely common for servers in the restaurant industry to have pint glasses slip off their serving tray, wasting both time and money for the restaurant. I have designed a sleeve attachment that will clip on to the bottom of a pint glass. The metal sleeve attachment will be attracted to a magnet placed into the serving tray. This increases the normal force of the pint glass, resulting in an increase in the friction force between the tray and sleeve attachment, and helping secure the glass to the tray. In order to optimize the design, the value of the …

Stream Power Analysis Of The Mid-Barataria Conveyance Channel Model, Jack Graham

LSU Master's Theses

Louisiana’s coast is disappearing at an alarming rate. Erosion, subsidence, sea level rise, and the devastating impacts from hurricanes have contributed to the loss of thousands of square miles of land that was once a thriving ecosystem. The Louisiana government is taking action to help protect and restore these coastal habitats, which are a home to some two million people and numerous species of animals, birds, and fish. The Mid-Barataria Sediment Diversion is a new type of project to help create land in Barataria Basin. Conceptually, the diversion is designed to use the available sediment and stream power provided by …

The Physics Of Fire By Friction, Bradley D. Duncan

Electrical and Computer Engineering Faculty Publications

In what follows I will attempt to produce a rigorous, macroscopic, time averaged model of the process of creating fire by friction – up to the point of initial ember formation. I will employ reasonable, practical approximations with the goal of developing mathematical results that are experimentally verifiable. Although force, velocity, pressure and the like are actually vector quantities, due to the symmetry of the problem I will perform a scalar analysis only. Also, to simplify the analysis I will assume that the assortment of variables we will encounter are independent. Mostly this assumption is valid, though on occasion I …

On Numerical Modeling Of Equal Channel Angular Extrusion Of Ultra High Molecular Weight Polyethylene, Kostiantyn Vasylevskyi, Kateryna I. Miroshnichenko, Stanislav Buklovskyi, Igor I. Tsukrov, Hannah Grover, Douglas Van Citters

New Hampshire EPSCoR

Ultra high molecular weight polyethylene (UHMWPE) is widely used in biomedical applications, e.g. as a bearing surface in total joint arthroplasty. Recently, equal channel angular extrusion (ECAE) was proposed as a processing method to achieve higher molecular entanglement and superior mechanical properties of this material. Numerical modeling can be utilized to evaluate the influence of such important manufacturing parameters as the extrusion rate, temperature, geometry of the die, back pressure and friction effects in the ECAE of polyethylenes.

In this paper we focus on the development of efficient FE models of ECAE for UHMWPE. We study the applicability of the …

Pitting Strength Estimate For Cast Iron And Copper Alloy Materials, Edward E. Osakue, Lucky Anetor, Kendall Harris

Faculty Publications

An attempt is made to predict the pitting strength of cast iron and copper alloy materials from their compressive yield or compressive proof strength for a reliability of 99% at 107load cycles. The compressive yield or compressive proof strength is related to the tensile strength of ductile cast iron and copper alloy materials by a proportionality factor. Two proportionality factors are used for brittle cast iron materials. The pitting strength formulation incorporates a nominal design factor at 99% reliability which is estimated from a probabilistic model based on the lognormal probability density function. Pitting strength estimates from the predictions are …

One-Dimensional Lateral Force Anisotropy At The Atomic Scale In Sliding Single Molecules On A Surface, Yuan Zhang, Daniel J. Trainer, Badri Narayanan, Yang Li, Anh T. Ngo, Sushila Khadka, Arnab Neogi, Brandon Fisher, Larry A. Curtiss, Subramanian K.R.S. Sankaranarayanan, Saw Wai Hla

Physics Faculty Publications

Using a q+ atomic force microscopy at low temperature, a sexiphenyl molecule is slid across an atomically flat Ag(111) surface along the direction parallel to its molecular axis and sideways to the axis. Despite identical contact area and underlying surface geometry, the lateral force required to move the molecule in the direction parallel to its molecular axis is found to be about half of that required to move it sideways. The origin of the lateral force anisotropy observed here is traced to the one-dimensional shape of the molecule, which is further confirmed by molecular dynamics simulations. We also demonstrate that …

Exertion (And What Follows), Joshua Charles Barnes

Senior Projects Spring 2021

Where do I even begin to discuss my process? As with all things artistic, it comes from experiences deep within, that manifest themselves over time. So, Exertion was several years, if not a lifetime, in the making. I had always been an anxious child all my life, but my experiences with mental illness didn’t truly begin until my freshman year of high school. From then on, it was a constant mixture of depression, anxiety, and obsessive thoughts, and how to navigate through adolescence with these in mind. They have become severe a couple of times, but fortunately I was able …

A New Generation Of Smart Multifunctional Additive For High-Temperature Lubrication In Metal Forming Processes, Sang T. Pham

University of Wollongong Thesis Collection 2017+

High-temperature lubrication plays a critical role in various engineering processes of hot metal forming (e.g. hot forging, hot rolling, hot extrusion…). It has been acknowledged that high energy efficiency, low material losses, and optimum product quality can be achieved by the application of effective lubricants. Although sodium-containing glass melts have proven themselves as the outstanding candidate lubricant for hot metalworking processes, they have reached their performance limit. In addition, the concern about the corrosion of sodium toward oxide scale is also highlighted. The current study not only puts an effort into improving the lubricity of the existing melt lubricants but …