subject:( Boundary lubrication)

Loughborough University

1. Grimble, David. Ultra-thin film tribology of elastomeric seals in pressurised metered dose inhalers.

Degree: PhD, 2009, Loughborough University

URL: https://dspace.lboro.ac.uk/2134/6376 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.564364

► Within pressurised Metered Dose Inhalers (pMDIs) the contact between the valve components and elastomeric seals is of major significance, representing the main contributory factor to… (more)

▼ Within pressurised Metered Dose Inhalers (pMDIs) the contact between the valve components and elastomeric seals is of major significance, representing the main contributory factor to the overall system frictional characteristics. Therefore, the seal performance is extremely important and must be optimised to meet the contradictory requirements of preventing leakage and allowing smooth actuation. The environmentally driven trend to HFA formulations as opposed to CFC based ones has deteriorated this problem due to poor lubrication conditions and it has, consequently, increased the frictional losses during the pMDI actuation (hysteresis cycle). Research has been conducted into the key areas of the inhaler mechanism. As such, the contact pressure distribution and resulting reactions have been investigated, with emphasis on the correct treatment of the elastomer (seal) characteristics. The modelling of the device has been conducted within the environment of the multibody dynamics commercial software ADAMS, where a virtual prototype has been built using solid CAD geometries of the valve components. An equation was extrapolated to describe the relation between the characteristics of the ultra thin film contact conditions (sliding velocity, surface geometry, film thickness and reaction force) encountered within the inhaler valve and integrated into the virtual prototype allowing the calculation of friction within the conjuncture (due to viscous shear and adhesion). The latter allowed the analysis and optimisation of key device parameters, such as seal geometry, lubricant properties etc. It has been concluded that the dominant mechanism of friction is adhesion, while boundary lubrication is the prevailing lubrication regime due to the poor surface roughness to film thickness ratio. The multibody dynamics model represents a novel multi physics approach to study the behaviour of pMDIs, including rigid body inertial dynamics, general elasticity, surface interactions (such as adhesion), hydrodynamics and intermolecular surface interactions (such as Van der Waals forces). Good agreement has been obtained against experimental results at component and device level.

Subjects/Keywords: 615.8; pMDI; Elastomeric seals; Regimes of lubrication; Friction; Adhesion; Boundary lubrication

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APA (6^th Edition):

Grimble, D. (2009). Ultra-thin film tribology of elastomeric seals in pressurised metered dose inhalers. (Doctoral Dissertation). Loughborough University. Retrieved from https://dspace.lboro.ac.uk/2134/6376 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.564364

Chicago Manual of Style (16^th Edition):

Grimble, David. “Ultra-thin film tribology of elastomeric seals in pressurised metered dose inhalers.” 2009. Doctoral Dissertation, Loughborough University. Accessed December 11, 2019. https://dspace.lboro.ac.uk/2134/6376 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.564364.

MLA Handbook (7^th Edition):

Grimble, David. “Ultra-thin film tribology of elastomeric seals in pressurised metered dose inhalers.” 2009. Web. 11 Dec 2019.

Vancouver:

Grimble D. Ultra-thin film tribology of elastomeric seals in pressurised metered dose inhalers. [Internet] [Doctoral dissertation]. Loughborough University; 2009. [cited 2019 Dec 11]. Available from: https://dspace.lboro.ac.uk/2134/6376 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.564364.

Council of Science Editors:

Grimble D. Ultra-thin film tribology of elastomeric seals in pressurised metered dose inhalers. [Doctoral Dissertation]. Loughborough University; 2009. Available from: https://dspace.lboro.ac.uk/2134/6376 ; http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.564364

Penn State University

2. Yu, Qingtao. Development of a Gear-meshing Tribology Model with Application to Loss-of-lubrication Analysis.

Degree: PhD, Mechanical Engineering, 2016, Penn State University

URL: https://etda.libraries.psu.edu/catalog/vx021f09b

► The dissertation focuses on gear-meshing tribology under the loss-of-lubrication (LoL) condition. A physics-based line-contact tribology model for the entire lubrication regime is developed. The line-contact… (more)

▼ The dissertation focuses on gear-meshing tribology under the loss-of-lubrication (LoL) condition. A physics-based line-contact tribology model for the entire lubrication regime is developed. The line-contact tribology model is integrated with gear kinematics to establish a gear-meshing tribology model. As the primary application, the gear-meshing tribology model is coupled with a heat transfer model to conduct system-level transient analysis of LoL performance between a pair of spur gears. Based on the load sharing between hydrodynamic pressure (fluid) and solid contact, the entire lubrication regime is commonly divided into elasto-hydrodynamic lubrication (EHL), mixed lubrication (ML) and boundary lubrication (BL). To establish a physics-based model, the dissertation further divides the mixed lubrication regime into three sub-regimes: light-mixed lubrication, significant-mixed lubrication and near-boundary lubrication, based on their physical characterizes. A model is developed for the boundary and near-boundary lubrication regimes where the majority of the contact load is supported by solid contact. This model accommodates key thermo-mechanical and tribo-chemistry considerations in these two regimes, including contact temperature, contact friction coefficient, surface boundary films and the boundary film failure criteria. A well-established line-contact tribology model is then reviewed and used to model the EHL and light-mixed lubrication regimes where the contact load is essentially carried by hydrodynamic pressure, and only a small portion of the load is carried by surface asperities (roughness). In the significant-mixed lubrication regime, comparable load is shared between the fluid and the solid. In this regime, the strong coupling between the fluid pressure and the solid contacts makes a sound first-principle model for this regime intractable. A physics-based interpolation method is then developed and applied to approximate the contact and lubrication variables in this regime. The contact between unmodified involute spur gear teeth is equivalent to a line contact. During the mesh between a pair of teeth, contact load, surface velocities, and contact geometries of the equivalent line contact vary based on a number of gear configurations. In the gear-meshing tribology model, the meshing kinematics of involute spur gears is integrated with the line-contact tribology such that, with given gear configurations, system operating parameters, gear bulk temperature and lubrication condition, contact variables (pressure, temperature and friction force etc.) can be obtained at every meshing position, thus to evaluate the meshing performance. To simulate gearbox loss-of-lubrication performance, the gear-meshing tribology model is coupled with a system heat transfer model to develop a system-level simulation tool, which is used to analyze the interaction between local tooth meshing tribology and global gearbox heat balance. A nominal system based on the LoL test gearbox facility at NASA Glenn Research Center is studied.…

Subjects/Keywords: gearbox; loss-of-lubrication; tribology; boundary lubrication; elastic-plastic contact; flash temperature; simulation

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APA (6^th Edition):

Yu, Q. (2016). Development of a Gear-meshing Tribology Model with Application to Loss-of-lubrication Analysis. (Doctoral Dissertation). Penn State University. Retrieved from https://etda.libraries.psu.edu/catalog/vx021f09b

Chicago Manual of Style (16^th Edition):

Yu, Qingtao. “Development of a Gear-meshing Tribology Model with Application to Loss-of-lubrication Analysis.” 2016. Doctoral Dissertation, Penn State University. Accessed December 11, 2019. https://etda.libraries.psu.edu/catalog/vx021f09b.

MLA Handbook (7^th Edition):

Yu, Qingtao. “Development of a Gear-meshing Tribology Model with Application to Loss-of-lubrication Analysis.” 2016. Web. 11 Dec 2019.

Vancouver:

Yu Q. Development of a Gear-meshing Tribology Model with Application to Loss-of-lubrication Analysis. [Internet] [Doctoral dissertation]. Penn State University; 2016. [cited 2019 Dec 11]. Available from: https://etda.libraries.psu.edu/catalog/vx021f09b.

Council of Science Editors:

Yu Q. Development of a Gear-meshing Tribology Model with Application to Loss-of-lubrication Analysis. [Doctoral Dissertation]. Penn State University; 2016. Available from: https://etda.libraries.psu.edu/catalog/vx021f09b

Brno University of Technology

3. Orbán, Tomáš. Tribologie pístních kroužků spalovacích motorů .

Degree: 2014, Brno University of Technology

URL: http://hdl.handle.net/11012/32549

► Témou bakalárskej práce je tribológia piestnych krúžkov spaľovacích motorov. Práca je rozdelená do 7 kapitol. Prvá kapitola sa zaoberá piestnymi krúžkami, požiadavkami na piestne krúžky,… (more)

▼ Témou bakalárskej práce je tribológia piestnych krúžkov spaľovacích motorov. Práca je rozdelená do 7 kapitol. Prvá kapitola sa zaoberá piestnymi krúžkami, požiadavkami na piestne krúžky, popisom hlavných funkcií piestnych krúžkov, typmi piestnych krúžkov, kompresnými krúžkami a stieracími krúžkami. Na záver tejto kapitoly sú uvedené informácie o kinematike piestnych krúžkov. Druhá kapitola uvádza mechanizmus trenia a mazania piestnych krúžkov, venuje sa tribológii, treniu, histórii pozorovania trenia, mechanizmom trenia a vhodnosti trenia. Okrem toho práca obsahuje informácie o mazaní, konkrétne o spôsobe mazania motorov s vnútorným spaľovaním a režimoch mazania. Tretia kapitola sa zaoberá hydrodynamickým mazaním. Témou štvrtej kapitoly je medzné mazanie. Piata kapitola uvádza informácie o zmiešanom mazaní. Trenie v olejovej vrstve je témou šiestej kapitoly. Posledná siedma kapitola sa venuje treniu kontaktu nerovností styčných plôch.; The theme of the thesis is tribology of piston rings for internal combustion engines. The work is divided into seven chapters. The first chapter deals with the piston rings, piston rings requirements, describes the main functions of piston rings, types of piston rings, compression rings and oil control rings. Finally, this chapter provides information about the kinematics of piston rings. The second chapter presents the mechanism of friction and lubrication of piston rings, is dedicated to tribology, friction, friction observation history, mechanism of friction and friction suitability. In addition, the work contains information about lubrication, specifically about a lubrication way of internal combustion engines and lubrication regimes. The third chapter deals with hydrodynamic lubrication. The theme of the fourth chapter is boundary lubrication. The fifth chapter provides information about mixed lubrication. Friction in the oil film is the theme of the sixth chapter. Last seventh chapter deals with dry contact friction due to surface roughness contact. Advisors/Committee Members: Raffai, Peter (advisor).

Subjects/Keywords: piestne krúžky; tribológia; trenie; mazanie; hydrodynamické mazanie; medzné mazanie; zmiešané mazanie; piston rings; tribology; friction; lubrication; hydrodynamic lubrication; boundary lubrication; mixed lubrication

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APA (6^th Edition):

Orbán, T. (2014). Tribologie pístních kroužků spalovacích motorů . (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/32549

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Orbán, Tomáš. “Tribologie pístních kroužků spalovacích motorů .” 2014. Thesis, Brno University of Technology. Accessed December 11, 2019. http://hdl.handle.net/11012/32549.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Orbán, Tomáš. “Tribologie pístních kroužků spalovacích motorů .” 2014. Web. 11 Dec 2019.

Vancouver:

Orbán T. Tribologie pístních kroužků spalovacích motorů . [Internet] [Thesis]. Brno University of Technology; 2014. [cited 2019 Dec 11]. Available from: http://hdl.handle.net/11012/32549.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Orbán T. Tribologie pístních kroužků spalovacích motorů . [Thesis]. Brno University of Technology; 2014. Available from: http://hdl.handle.net/11012/32549

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Brno University of Technology

4. Orság, Josef. Typické poruchy pístních kroužků a jejich nápravná opatření .

Degree: 2015, Brno University of Technology

URL: http://hdl.handle.net/11012/39745

► Tato bakalářská práce se zabývá nejčastějšími poruchami pístních kroužků. První část práce je zaměřena na konstrukční provedení pístních kroužku a na zatížení, která na ně… (more)

Subjects/Keywords: Pístní kroužky; píst; mazání; poruchy; opotřebení; tření; hydrodynamické mazání; mezné mazání; smíšené mazání.; Piston rings; piston; lubrication; failures; wear; friction; hydrodynamic lubrication; boundary lubrication; mixed lubrication.

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APA (6^th Edition):

Orság, J. (2015). Typické poruchy pístních kroužků a jejich nápravná opatření . (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/39745

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Orság, Josef. “Typické poruchy pístních kroužků a jejich nápravná opatření .” 2015. Thesis, Brno University of Technology. Accessed December 11, 2019. http://hdl.handle.net/11012/39745.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Orság, Josef. “Typické poruchy pístních kroužků a jejich nápravná opatření .” 2015. Web. 11 Dec 2019.

Vancouver:

Orság J. Typické poruchy pístních kroužků a jejich nápravná opatření . [Internet] [Thesis]. Brno University of Technology; 2015. [cited 2019 Dec 11]. Available from: http://hdl.handle.net/11012/39745.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Orság J. Typické poruchy pístních kroužků a jejich nápravná opatření . [Thesis]. Brno University of Technology; 2015. Available from: http://hdl.handle.net/11012/39745

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

5. Seo, Dongjin. Measurement and Control of Slip-Flow Boundary Conditions at Solid-Gas Interfaces.

Degree: PhD, Chemical Engineering, 2014, Virginia Tech

URL: http://hdl.handle.net/10919/50650

► This thesis describes measurements of the gas-solid flow boundary condition at moderate Knudsen number, i.e., where the dimensions of the flow are similar to the… (more)

▼ This thesis describes measurements of the gas-solid flow boundary condition at moderate Knudsen number, i.e., where the dimensions of the flow are similar to the mean free path, and thus partial slip is expected. This regime has become more important with increased focus on nano-scale devices, but there is currently no consensus on how the slip length should vary for different solids and gases, or whether it can be controlled. In this thesis, I describe unambiguous measurements showing that partial slip occurs, that the slip length depends both on gas and solid, and that the slip length can be altered in situ. The slip length is determined from analysis of the vibration of a small sphere adjacent to a solid. I also describe applications of these findings both to the separation of gases, and to inhalants. The effect of water films, gas species, organic films, and electric fields on gas flow was studied. Water films had a large, but complex effect. On bare hydrophobilic glass, the tangential momentum accommodation coefficient (TMAC) for nitrogen on hydroxyl-terminated silica changed from 0.25 to 0.88 when the humidity changed from 0 to 98 %. On hydrophobized glass, TMAC changed from 0.20 to 0.56 in the same range. The effect of the gas on TMAC was measured for five different gases (helium, nitrogen, argon, carbon dioxide, hexafluoride sulfur) on octadecyltrichlorosilane-coated glass surfaces. A lower TMAC occurred for greater molar mass, and this trend was explained using a simple model representing both the gas and the monolayer by spheres. The existence of this gas-dependent difference in TMAC suggests that gases can be separated based on their collisions with surfaces. Methods for controlling the flow boundary condition were also developed by adsorbing monolayers on the solid, and altering the monolayers in situ. Both temperature and electric fields altered the boundary condition, and these changes were attributed to changes in the surface roughness. The effect of roughness was modeled with grooved surfaces. Possible applications of this effect of roughness include changing the flow of aerosol droplets for deeper delivery of therapeutic drugs into the lung. Advisors/Committee Members: Ducker, William A. (committeechair), Martin, Stephen Michael (committee member), Paul, Mark R. (committee member), Davis, Richey M. (committee member).

Subjects/Keywords: gas; slip flow; accommodation coefficient; boundary condition; lubrication

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Seo, D. (2014). Measurement and Control of Slip-Flow Boundary Conditions at Solid-Gas Interfaces. (Doctoral Dissertation). Virginia Tech. Retrieved from http://hdl.handle.net/10919/50650

Chicago Manual of Style (16^th Edition):

Seo, Dongjin. “Measurement and Control of Slip-Flow Boundary Conditions at Solid-Gas Interfaces.” 2014. Doctoral Dissertation, Virginia Tech. Accessed December 11, 2019. http://hdl.handle.net/10919/50650.

MLA Handbook (7^th Edition):

Seo, Dongjin. “Measurement and Control of Slip-Flow Boundary Conditions at Solid-Gas Interfaces.” 2014. Web. 11 Dec 2019.

Vancouver:

Seo D. Measurement and Control of Slip-Flow Boundary Conditions at Solid-Gas Interfaces. [Internet] [Doctoral dissertation]. Virginia Tech; 2014. [cited 2019 Dec 11]. Available from: http://hdl.handle.net/10919/50650.

Council of Science Editors:

Seo D. Measurement and Control of Slip-Flow Boundary Conditions at Solid-Gas Interfaces. [Doctoral Dissertation]. Virginia Tech; 2014. Available from: http://hdl.handle.net/10919/50650

University of Windsor

6. Su, Jun Feng. Investigation of metallurgical coatings for automotive applications.

Degree: PhD, Mechanical, Automotive, and Materials Engineering, 2014, University of Windsor

URL: http://scholar.uwindsor.ca/etd/5104

► Metallurgical coatings have been widely used in the automotive industry from component machining, engine daily running to body decoration due to their high hardness,… (more)

▼ Metallurgical coatings have been widely used in the automotive industry from component machining, engine daily running to body decoration due to their high hardness, wear resistance, corrosion resistance and low friction coefficient. With high demands in energy saving, weight reduction and limiting environmental impact, the use of new materials such as light Aluminum/magnesium alloys with high strength-weight ratio for engine block and advanced high-strength steel (AHSS) with better performance in crash energy management for die stamping, are increasing. However, challenges are emerging when these new materials are applied such as the wear of the relative soft light alloys and machining tools for hard AHSS. The protective metallurgical coatings are the best option to profit from these new materials' advantages without altering largely in mass production equipments, machinery, tools and human labor. In this dissertation, a plasma electrolytic oxidation (PEO) coating processing on aluminum alloys was introduced in engine cylinder bores to resist wear and corrosion. The tribological behavior of the PEO coatings under boundary and starve lubrication conditions was studied experimentally and numerically for the first time. Experimental results of the PEO coating demonstrated prominent wear resistance and low friction, taking into account the extreme working conditions. The numerical elastohydrodynamic lubrication (EHL) and asperity contact based tribological study also showed a promising approach on designing low friction and high wear resistant PEO coatings. Other than the fabrication of the new coatings, a novel coating evaluation methodology, namely, inclined impact sliding tester was presented in the second part of this dissertation. This methodology has been developed and applied in testing and analyzing physical vapor deposition (PVD)/ chemical vapor deposition (CVD)/PEO coatings. Failure mechanisms of these common metallurgical hard coatings were systematically studied and summarized via the new testing methodology. Field tests based on the new coating characterization technique proved that this methodology is reliable, effective and economical. Advisors/Committee Members: Hu, Henry.

Subjects/Keywords: Applied sciences; Boundary/mixed lubrication; Inclinde impact-sliding test; Lubrication simulation; Metallurgical coating; Plasmas electrolytic oxidation

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APA (6^th Edition):

Su, J. F. (2014). Investigation of metallurgical coatings for automotive applications. (Doctoral Dissertation). University of Windsor. Retrieved from http://scholar.uwindsor.ca/etd/5104

Chicago Manual of Style (16^th Edition):

Su, Jun Feng. “Investigation of metallurgical coatings for automotive applications.” 2014. Doctoral Dissertation, University of Windsor. Accessed December 11, 2019. http://scholar.uwindsor.ca/etd/5104.

MLA Handbook (7^th Edition):

Su, Jun Feng. “Investigation of metallurgical coatings for automotive applications.” 2014. Web. 11 Dec 2019.

Vancouver:

Su JF. Investigation of metallurgical coatings for automotive applications. [Internet] [Doctoral dissertation]. University of Windsor; 2014. [cited 2019 Dec 11]. Available from: http://scholar.uwindsor.ca/etd/5104.

Council of Science Editors:

Su JF. Investigation of metallurgical coatings for automotive applications. [Doctoral Dissertation]. University of Windsor; 2014. Available from: http://scholar.uwindsor.ca/etd/5104

Universidade do Rio Grande do Norte

7. Trajano, Marinalva Ferreira. Estudo tribológico de biolubrificantes com adição de nanopartículas de óxidos (zinco e cobre) .

Degree: 2013, Universidade do Rio Grande do Norte

URL: http://repositorio.ufrn.br/handle/123456789/15722

► Currently, vegetable oils have been studied for bio-lubricants base that fits the new environmental standards. Since, in a world full of finite natural resources, mineral… (more)

Subjects/Keywords: Nanopartículas de óxidos. Biolubrificantes. Lubrificação limite; Nanoparticles of oxides. Bio-lubricants. Boundary lubrication

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APA (6^th Edition):

Trajano, M. F. (2013). Estudo tribológico de biolubrificantes com adição de nanopartículas de óxidos (zinco e cobre) . (Masters Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/15722

Chicago Manual of Style (16^th Edition):

Trajano, Marinalva Ferreira. “Estudo tribológico de biolubrificantes com adição de nanopartículas de óxidos (zinco e cobre) .” 2013. Masters Thesis, Universidade do Rio Grande do Norte. Accessed December 11, 2019. http://repositorio.ufrn.br/handle/123456789/15722.

MLA Handbook (7^th Edition):

Trajano, Marinalva Ferreira. “Estudo tribológico de biolubrificantes com adição de nanopartículas de óxidos (zinco e cobre) .” 2013. Web. 11 Dec 2019.

Vancouver:

Trajano MF. Estudo tribológico de biolubrificantes com adição de nanopartículas de óxidos (zinco e cobre) . [Internet] [Masters thesis]. Universidade do Rio Grande do Norte; 2013. [cited 2019 Dec 11]. Available from: http://repositorio.ufrn.br/handle/123456789/15722.

Council of Science Editors:

Trajano MF. Estudo tribológico de biolubrificantes com adição de nanopartículas de óxidos (zinco e cobre) . [Masters Thesis]. Universidade do Rio Grande do Norte; 2013. Available from: http://repositorio.ufrn.br/handle/123456789/15722

Universidade do Rio Grande do Norte

8. Trajano, Marinalva Ferreira. Estudo tribológico de biolubrificantes com adição de nanopartículas de óxidos (zinco e cobre) .

Degree: 2013, Universidade do Rio Grande do Norte

URL: http://repositorio.ufrn.br/handle/123456789/15722

► Currently, vegetable oils have been studied for bio-lubricants base that fits the new environmental standards. Since, in a world full of finite natural resources, mineral… (more)

Subjects/Keywords: Nanopartículas de óxidos. Biolubrificantes. Lubrificação limite; Nanoparticles of oxides. Bio-lubricants. Boundary lubrication

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Trajano, M. F. (2013). Estudo tribológico de biolubrificantes com adição de nanopartículas de óxidos (zinco e cobre) . (Thesis). Universidade do Rio Grande do Norte. Retrieved from http://repositorio.ufrn.br/handle/123456789/15722

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Trajano, Marinalva Ferreira. “Estudo tribológico de biolubrificantes com adição de nanopartículas de óxidos (zinco e cobre) .” 2013. Thesis, Universidade do Rio Grande do Norte. Accessed December 11, 2019. http://repositorio.ufrn.br/handle/123456789/15722.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Trajano, Marinalva Ferreira. “Estudo tribológico de biolubrificantes com adição de nanopartículas de óxidos (zinco e cobre) .” 2013. Web. 11 Dec 2019.

Vancouver:

Trajano MF. Estudo tribológico de biolubrificantes com adição de nanopartículas de óxidos (zinco e cobre) . [Internet] [Thesis]. Universidade do Rio Grande do Norte; 2013. [cited 2019 Dec 11]. Available from: http://repositorio.ufrn.br/handle/123456789/15722.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Trajano MF. Estudo tribológico de biolubrificantes com adição de nanopartículas de óxidos (zinco e cobre) . [Thesis]. Universidade do Rio Grande do Norte; 2013. Available from: http://repositorio.ufrn.br/handle/123456789/15722

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Pretoria

9. Marais, Gerhard. An investigation into the role of compounds affecting friction, wear and lubricity.

Degree: Chemical Engineering, 2013, University of Pretoria

URL: http://hdl.handle.net/2263/23177

► The high frequency reciprocating rig (HFRR) is typically used to determine the lubricity of diesel fuels and has been accepted as the universal test apparatus… (more)

▼ The high frequency reciprocating rig (HFRR) is typically used to determine the lubricity of diesel fuels and has been accepted as the universal test apparatus in most countries of the world. A study was undertaken to analyse results obtained with the HFRR instrument by identifying crucial factors contributing to friction and wear mechanisms during a lubricity test under given conditions that may lead to a better understanding of test results obtained. The transient temperature distribution on a semiinfinite disk due to a circular continuous oscillatory heat source was also modelled. The model was used to calculate the contact temperature of a contact similar to what can be expected in the HFRR apparatus. For lubricated tests a mixture of n-hexadecane (cetane) as base fluid and palmitic acid as lubricity additive was used. Experimental results, including results obtained by running unlubricated (dry) tests and results obtained from literature were all considered to formulate the hypothesis that a fully functional additive film will not survive the full duration of the lubricity test, which is 75 minutes (ISO 12156-1, 2003). Friction values obtained in the experiments conducted were much higher than what is expected for boundary films formed by long chain carboxylic acids. Comparable friction values were obtained in the first few seconds of the tests, but the friction values increased indicating the destruction of the boundary film. Metal oxide lubrication dominates for the remainder of the test. Information of the exact mechanism prevailing in the crucial first few seconds of the test should be obtained by increasing the data acquisition rate of the apparatus. It is believed that junction growth through adhesion is the dominant factor in the initial stages of the test. GCxGC/TOF-MS showed the formation of hexane and heptane, which is a strong indication of the catalytic decomposition of the C16-hydrocarbons in the sample. Advisors/Committee Members: Prof P L de Vaal (advisor).

Subjects/Keywords: Contact temperature; High frequency reciprocating rig (hfrr); Diesel lubricity; Palmitic acid; Boundary lubrication; Adsorption; UCTD

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Marais, G. (2013). An investigation into the role of compounds affecting friction, wear and lubricity. (Masters Thesis). University of Pretoria. Retrieved from http://hdl.handle.net/2263/23177

Chicago Manual of Style (16^th Edition):

Marais, Gerhard. “An investigation into the role of compounds affecting friction, wear and lubricity.” 2013. Masters Thesis, University of Pretoria. Accessed December 11, 2019. http://hdl.handle.net/2263/23177.

MLA Handbook (7^th Edition):

Marais, Gerhard. “An investigation into the role of compounds affecting friction, wear and lubricity.” 2013. Web. 11 Dec 2019.

Vancouver:

Marais G. An investigation into the role of compounds affecting friction, wear and lubricity. [Internet] [Masters thesis]. University of Pretoria; 2013. [cited 2019 Dec 11]. Available from: http://hdl.handle.net/2263/23177.

Council of Science Editors:

Marais G. An investigation into the role of compounds affecting friction, wear and lubricity. [Masters Thesis]. University of Pretoria; 2013. Available from: http://hdl.handle.net/2263/23177

University of Pretoria

10. [No author]. An investigation into the role of compounds affecting friction, wear and lubricity .

Degree: 2013, University of Pretoria

URL: http://upetd.up.ac.za/thesis/available/etd-03132013-155104/

► The high frequency reciprocating rig (HFRR) is typically used to determine the lubricity of diesel fuels and has been accepted as the universal test apparatus… (more)

▼ The high frequency reciprocating rig (HFRR) is typically used to determine the lubricity of diesel fuels and has been accepted as the universal test apparatus in most countries of the world. A study was undertaken to analyse results obtained with the HFRR instrument by identifying crucial factors contributing to friction and wear mechanisms during a lubricity test under given conditions that may lead to a better understanding of test results obtained. The transient temperature distribution on a semiinfinite disk due to a circular continuous oscillatory heat source was also modelled. The model was used to calculate the contact temperature of a contact similar to what can be expected in the HFRR apparatus. For lubricated tests a mixture of n-hexadecane (cetane) as base fluid and palmitic acid as lubricity additive was used. Experimental results, including results obtained by running unlubricated (dry) tests and results obtained from literature were all considered to formulate the hypothesis that a fully functional additive film will not survive the full duration of the lubricity test, which is 75 minutes (ISO 12156-1, 2003). Friction values obtained in the experiments conducted were much higher than what is expected for boundary films formed by long chain carboxylic acids. Comparable friction values were obtained in the first few seconds of the tests, but the friction values increased indicating the destruction of the boundary film. Metal oxide lubrication dominates for the remainder of the test. Information of the exact mechanism prevailing in the crucial first few seconds of the test should be obtained by increasing the data acquisition rate of the apparatus. It is believed that junction growth through adhesion is the dominant factor in the initial stages of the test. GCxGC/TOF-MS showed the formation of hexane and heptane, which is a strong indication of the catalytic decomposition of the C16-hydrocarbons in the sample. Advisors/Committee Members: Prof P L de Vaal (advisor).

Subjects/Keywords: Contact temperature; High frequency reciprocating rig (hfrr); Diesel lubricity; Palmitic acid; Boundary lubrication; Adsorption; UCTD

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

author], [. (2013). An investigation into the role of compounds affecting friction, wear and lubricity . (Masters Thesis). University of Pretoria. Retrieved from http://upetd.up.ac.za/thesis/available/etd-03132013-155104/

Chicago Manual of Style (16^th Edition):

author], [No. “An investigation into the role of compounds affecting friction, wear and lubricity .” 2013. Masters Thesis, University of Pretoria. Accessed December 11, 2019. http://upetd.up.ac.za/thesis/available/etd-03132013-155104/.

MLA Handbook (7^th Edition):

author], [No. “An investigation into the role of compounds affecting friction, wear and lubricity .” 2013. Web. 11 Dec 2019.

Vancouver:

author] [. An investigation into the role of compounds affecting friction, wear and lubricity . [Internet] [Masters thesis]. University of Pretoria; 2013. [cited 2019 Dec 11]. Available from: http://upetd.up.ac.za/thesis/available/etd-03132013-155104/.

Council of Science Editors:

author] [. An investigation into the role of compounds affecting friction, wear and lubricity . [Masters Thesis]. University of Pretoria; 2013. Available from: http://upetd.up.ac.za/thesis/available/etd-03132013-155104/

11. Crespo, Alexia. Compréhension de la tribologie des films limites : de l'organisation moléculaire à la réponse en friction : Le circuit neuronal du conditionnement à la peur : une perspective théorique.

Degree: Docteur es, Mécanique, 2017, Lyon

URL: http://www.theses.fr/2017LYSEC021

►

Le contrôle de la friction en régime limite s’effectue par le biais de lubrifiants qui, par l’adsorption de molécules sur les surfaces, réduisent les contacts… (more)

▼

Le contrôle de la friction en régime limite s’effectue par le biais de lubrifiants qui, par l’adsorption de molécules sur les surfaces, réduisent les contacts directs entre aspérités. Dans ce contexte, l’objectif de cette thèse est de comprendre et de coupler les mécanismes, à la fois, d’adsorption et d’auto-organisation de différents acides gras sur des surfaces, et les mécanismes de friction interfaciale sous des conditions stationnaires et transitoires. L’effet de l’architecture moléculaire, modifiée par la présence et la conformation d’une insaturation dans la chaîne aliphatique des acides gras, a également été analysé. La caractérisation in-situ, à l’échelle moléculaire, a été réalisée avec le tribomètre moléculaire ATLAS développé au LTDS. Cet appareil permet des déplacements quasi-statiques et dynamiques, d’une sphère mise en regard d’un plan, suivant trois axes. Trois solutions d’acides gras, en faible concentration dans du dodécane, ont été analysées. Les déplacements et les forces, normaux et tangentiels, sont mesurés à l’aide de capteurs capacitifs d’une résolution respective de 0.015 nm et 10 nN. Des sollicitations dynamiques superposées permettent de caractériser simultanément la rhéologie de l’interface confinée en termes d’amortissement et de raideur, dans les deux directions. Les résultats montrent que les acides gras s’adsorbent par interaction physique sur les surfaces pour former des films visco-élastiques d’une épaisseur d’environ 15 Å sur chaque surface. Le taux de couverture et la cinétique d’adsorption de ces couches dépendent de l’architecture moléculaire des acides gras. Cette dernière gouverne également la friction interfaciale, qui a été qualifiée de supraglissement, et la rhéologie des monocouches auto-assemblées. Les différentes organisations de films conduisent ainsi à différentes évolutions de la friction en fonction de la vitesse de glissement et de la pression de contact. La réponse en friction transitoire et l’accommodation lors du glissement vers un nouvel état stationnaire ont de plus été décrites par des distances caractéristiques, de plusieurs nanomètres, reflétant le renouvellement statistique des spots de contact, et par des temps de relaxation, de l’ordre de la seconde, décrivant le réarrangement moléculaire au sein de l’interface. Enfin, une modélisation théorique de la friction limite a été proposée afin de comprendre l’origine moléculaire de la friction entre monocouches d’acides gras mettant ainsi en évidence le couplage fort de deux échelles spatiales et temporelles.

Friction in boundary lubrication can be controlled by the adsorption of molecules on surfaces that reduce direct contacts between asperities. In this context, the aim of this thesis is to understand and to couple the mechanisms of adsorption and self-organization of different fatty acids on surfaces, with the mechanisms of interfacial friction under steady-state regime and transient conditions. The effect of the molecular architecture, modified by the presence and conformation of one unsaturation in the…

Advisors/Committee Members: Cayer-Barrioz, Juliette (thesis director), Mazuyer, Denis (thesis director), Morgado, Nazario (thesis director).

Subjects/Keywords: Acides gras; Forces de surface; Lubrification limite; Nanotribologie; Boundary lubrication; Fatty acids; Nanotribology; Surface forces

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Crespo, A. (2017). Compréhension de la tribologie des films limites : de l'organisation moléculaire à la réponse en friction : Le circuit neuronal du conditionnement à la peur : une perspective théorique. (Doctoral Dissertation). Lyon. Retrieved from http://www.theses.fr/2017LYSEC021

Chicago Manual of Style (16^th Edition):

Crespo, Alexia. “Compréhension de la tribologie des films limites : de l'organisation moléculaire à la réponse en friction : Le circuit neuronal du conditionnement à la peur : une perspective théorique.” 2017. Doctoral Dissertation, Lyon. Accessed December 11, 2019. http://www.theses.fr/2017LYSEC021.

MLA Handbook (7^th Edition):

Crespo, Alexia. “Compréhension de la tribologie des films limites : de l'organisation moléculaire à la réponse en friction : Le circuit neuronal du conditionnement à la peur : une perspective théorique.” 2017. Web. 11 Dec 2019.

Vancouver:

Crespo A. Compréhension de la tribologie des films limites : de l'organisation moléculaire à la réponse en friction : Le circuit neuronal du conditionnement à la peur : une perspective théorique. [Internet] [Doctoral dissertation]. Lyon; 2017. [cited 2019 Dec 11]. Available from: http://www.theses.fr/2017LYSEC021.

Council of Science Editors:

Crespo A. Compréhension de la tribologie des films limites : de l'organisation moléculaire à la réponse en friction : Le circuit neuronal du conditionnement à la peur : une perspective théorique. [Doctoral Dissertation]. Lyon; 2017. Available from: http://www.theses.fr/2017LYSEC021

University of Windsor

12. Francis, Victor Vimalrajan. Sliding wear behaviour of eutectic Al-Si alloy under lubricated conditions: An investigation on the effect of ethanol (E85) addition.

Degree: MA, Mechanical, Automotive, and Materials Engineering, 2011, University of Windsor

URL: https://scholar.uwindsor.ca/etd/5399

► Bio-fuels such as E85 (85% ethanol and 15% gasoline) are clean and cost effective alternative fuel sources. Their effects on the tribological performance of… (more)

Subjects/Keywords: Al-Si alloys; boundary lubrication; E85 bio-fuel; Engine oil; tribology; Ultra-mild wear

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APA (6^th Edition):

Francis, V. V. (2011). Sliding wear behaviour of eutectic Al-Si alloy under lubricated conditions: An investigation on the effect of ethanol (E85) addition. (Masters Thesis). University of Windsor. Retrieved from https://scholar.uwindsor.ca/etd/5399

Chicago Manual of Style (16^th Edition):

Francis, Victor Vimalrajan. “Sliding wear behaviour of eutectic Al-Si alloy under lubricated conditions: An investigation on the effect of ethanol (E85) addition.” 2011. Masters Thesis, University of Windsor. Accessed December 11, 2019. https://scholar.uwindsor.ca/etd/5399.

MLA Handbook (7^th Edition):

Francis, Victor Vimalrajan. “Sliding wear behaviour of eutectic Al-Si alloy under lubricated conditions: An investigation on the effect of ethanol (E85) addition.” 2011. Web. 11 Dec 2019.

Vancouver:

Francis VV. Sliding wear behaviour of eutectic Al-Si alloy under lubricated conditions: An investigation on the effect of ethanol (E85) addition. [Internet] [Masters thesis]. University of Windsor; 2011. [cited 2019 Dec 11]. Available from: https://scholar.uwindsor.ca/etd/5399.

Council of Science Editors:

Francis VV. Sliding wear behaviour of eutectic Al-Si alloy under lubricated conditions: An investigation on the effect of ethanol (E85) addition. [Masters Thesis]. University of Windsor; 2011. Available from: https://scholar.uwindsor.ca/etd/5399

Loughborough University

13. Grimble, David. Ultra-thin film tribology of elastomeric seals in pressurised metered dose inhalers.

Degree: PhD, 2009, Loughborough University

URL: http://hdl.handle.net/2134/6376

► Within pressurised Metered Dose Inhalers (pMDIs) the contact between the valve components and elastomeric seals is of major significance, representing the main contributory factor to… (more)

▼ Within pressurised Metered Dose Inhalers (pMDIs) the contact between the valve components and elastomeric seals is of major significance, representing the main contributory factor to the overall system frictional characteristics. Therefore, the seal performance is extremely important and must be optimised to meet the contradictory requirements of preventing leakage and allowing smooth actuation. The environmentally driven trend to HFA formulations as opposed to CFC based ones has deteriorated this problem due to poor lubrication conditions and it has, consequently, increased the frictional losses during the pMDI actuation (hysteresis cycle). Research has been conducted into the key areas of the inhaler mechanism. As such, the contact pressure distribution and resulting reactions have been investigated, with emphasis on the correct treatment of the elastomer (seal) characteristics. The modelling of the device has been conducted within the environment of the multibody dynamics commercial software ADAMS, where a virtual prototype has been built using solid CAD geometries of the valve components. An equation was extrapolated to describe the relation between the characteristics of the ultra thin film contact conditions (sliding velocity, surface geometry, film thickness and reaction force) encountered within the inhaler valve and integrated into the virtual prototype allowing the calculation of friction within the conjuncture (due to viscous shear and adhesion). The latter allowed the analysis and optimisation of key device parameters, such as seal geometry, lubricant properties etc. It has been concluded that the dominant mechanism of friction is adhesion, while boundary lubrication is the prevailing lubrication regime due to the poor surface roughness to film thickness ratio. The multibody dynamics model represents a novel multi physics approach to study the behaviour of pMDIs, including rigid body inertial dynamics, general elasticity, surface interactions (such as adhesion), hydrodynamics and intermolecular surface interactions (such as Van der Waals forces). Good agreement has been obtained against experimental results at component and device level.

Subjects/Keywords: 615.8; pMDI; Elastomeric seals; Regimes of lubrication; Friction; Adhesion; Boundary lubrication

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Grimble, D. (2009). Ultra-thin film tribology of elastomeric seals in pressurised metered dose inhalers. (Doctoral Dissertation). Loughborough University. Retrieved from http://hdl.handle.net/2134/6376

Chicago Manual of Style (16^th Edition):

Grimble, David. “Ultra-thin film tribology of elastomeric seals in pressurised metered dose inhalers.” 2009. Doctoral Dissertation, Loughborough University. Accessed December 11, 2019. http://hdl.handle.net/2134/6376.

MLA Handbook (7^th Edition):

Grimble, David. “Ultra-thin film tribology of elastomeric seals in pressurised metered dose inhalers.” 2009. Web. 11 Dec 2019.

Vancouver:

Grimble D. Ultra-thin film tribology of elastomeric seals in pressurised metered dose inhalers. [Internet] [Doctoral dissertation]. Loughborough University; 2009. [cited 2019 Dec 11]. Available from: http://hdl.handle.net/2134/6376.

Council of Science Editors:

Grimble D. Ultra-thin film tribology of elastomeric seals in pressurised metered dose inhalers. [Doctoral Dissertation]. Loughborough University; 2009. Available from: http://hdl.handle.net/2134/6376

University of Western Australia

14. Chua, Wenhsi. The growth of thin lubricating films of plant oils.

Degree: PhD, 2012, University of Western Australia

URL: http://repository.uwa.edu.au:80/R/?func=dbin-jump-full&object_id=40193&local_base=GEN01-INS01

►

The extreme conditions of high pressure and shear imposed in a lubricated sliding contact could promote tribochemical reactions and polymerization over long sliding distances. These… (more)

▼

The extreme conditions of high pressure and shear imposed in a lubricated sliding contact could promote tribochemical reactions and polymerization over long sliding distances. These chemical changes are likely to alter the film thickness and friction. Unsaturated plant oils inherently possess two characteristics that would favour the process of polymerization at the lubricant-surface interface – poor oxidation stability and a high affinity with metals. Boundary films formed by plant oils could possibly polymerize and thicken when they are subjected to long periods of lubricated sliding. A new tribometer, capable of simultaneously measuring film thickness, friction and wear was developed to test this hypothesis. The instrument is capable of measuring film thickness measurements down to 1 nm by employing a modified capacitance method. In all, thirteen refined and unrefined plant oils were tested. The results revealed for the first time, that boundary films of some plant oils can grow to thicknesses much greater than their adsorbed molecular heights. Some films grew as much as 25 times in thickness (unrefined canola oil), while others remained roughly unchanged (flaxseed and olive oil), or grew slightly and then collapsed during the test (safflower oil). It was initially expected that the film growth rate could be correlated to the degree of unsaturation of the oils. However, results from gas chromatography mass spectroscopy (GCMS) analysis revealed little evidence of such correlation. It follows that minor components, particularly in the unrefined oils, might have had an influence on the film growth behaviour. To further investigate this, surface-enhanced Raman spectroscopy (SERS) was used to study and compare the differences in the chemical nature of the boundary films formed by refined and unrefined canola oil. This is the first time that metallic surfaces lubricated by plant oils have been studied using this technique. The results of this work provided strong evidence that fatty acids were liberated from the triglyceride structure during sliding to form a fatty acid soap layer on the silver surface. The study also revealed that the fatty acid chains of the unrefined canola oil were more disordered and most likely in a gauche conformation, while that of the refined canola oil were tightly packed and oriented perpendicular to the surface. Using inductively-coupled plasma mass spectroscopy (ICP-MS), comparatively higher levels of phosphorus, were also found in the unrefined canola oil and unrefined macadamia oil samples, both of which had experienced greater film growth. It is believed that the phosphorus found originated from phospholipids in the unrefined oils, could have been directly or indirectly related to the film growth observed. Its role and the mechanism in which it affects film growth, however, remain to be elucidated.

The extreme conditions of high pressure and shear imposed in a lubricated sliding contact could promote tribochemical reactions and polymerization over long sliding distances. These…

Subjects/Keywords: Film thickness; Fats and oils; Boundary lubrication; Spectroscopy; Structure-functional properties; Friction; Capacitance method; Tribochemical reactions

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Chua, W. (2012). The growth of thin lubricating films of plant oils. (Doctoral Dissertation). University of Western Australia. Retrieved from http://repository.uwa.edu.au:80/R/?func=dbin-jump-full&object_id=40193&local_base=GEN01-INS01

Chicago Manual of Style (16^th Edition):

Chua, Wenhsi. “The growth of thin lubricating films of plant oils.” 2012. Doctoral Dissertation, University of Western Australia. Accessed December 11, 2019. http://repository.uwa.edu.au:80/R/?func=dbin-jump-full&object_id=40193&local_base=GEN01-INS01.

MLA Handbook (7^th Edition):

Chua, Wenhsi. “The growth of thin lubricating films of plant oils.” 2012. Web. 11 Dec 2019.

Vancouver:

Chua W. The growth of thin lubricating films of plant oils. [Internet] [Doctoral dissertation]. University of Western Australia; 2012. [cited 2019 Dec 11]. Available from: http://repository.uwa.edu.au:80/R/?func=dbin-jump-full&object_id=40193&local_base=GEN01-INS01.

Council of Science Editors:

Chua W. The growth of thin lubricating films of plant oils. [Doctoral Dissertation]. University of Western Australia; 2012. Available from: http://repository.uwa.edu.au:80/R/?func=dbin-jump-full&object_id=40193&local_base=GEN01-INS01

Georgia Tech

15. Fortier, Alicia Elena. Numerical Simulation of Hydrodynamic Bearings with Engineered Slip/No-Slip Surfaces.

Degree: MS, Mechanical Engineering, 2004, Georgia Tech

URL: http://hdl.handle.net/1853/4929

► The no-slip boundary condition is the foundation of traditional lubrication theory. It says that fluid adjacent to a solid boundary has zero velocity relative to… (more)

Subjects/Keywords: Tribology; Hydrodynamic bearings; Slip boundary condition; Lubrication

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Fortier, A. E. (2004). Numerical Simulation of Hydrodynamic Bearings with Engineered Slip/No-Slip Surfaces. (Masters Thesis). Georgia Tech. Retrieved from http://hdl.handle.net/1853/4929

Chicago Manual of Style (16^th Edition):

Fortier, Alicia Elena. “Numerical Simulation of Hydrodynamic Bearings with Engineered Slip/No-Slip Surfaces.” 2004. Masters Thesis, Georgia Tech. Accessed December 11, 2019. http://hdl.handle.net/1853/4929.

MLA Handbook (7^th Edition):

Fortier, Alicia Elena. “Numerical Simulation of Hydrodynamic Bearings with Engineered Slip/No-Slip Surfaces.” 2004. Web. 11 Dec 2019.

Vancouver:

Fortier AE. Numerical Simulation of Hydrodynamic Bearings with Engineered Slip/No-Slip Surfaces. [Internet] [Masters thesis]. Georgia Tech; 2004. [cited 2019 Dec 11]. Available from: http://hdl.handle.net/1853/4929.

Council of Science Editors:

Fortier AE. Numerical Simulation of Hydrodynamic Bearings with Engineered Slip/No-Slip Surfaces. [Masters Thesis]. Georgia Tech; 2004. Available from: http://hdl.handle.net/1853/4929

Iowa State University

16. Jazaa, Yosef. Effect of nanoparticle additives on the tribological behavior of oil under boundary lubrication.

Degree: 2018, Iowa State University

URL: https://lib.dr.iastate.edu/etd/16773

► In this study, three different nanoparticles (CuO, WC, WS2) of comparable nominal diameter, were added to a Polyalphaolefin (PAO) base oil to evaluate tribological response… (more)

▼ In this study, three different nanoparticles (CuO, WC, WS2) of comparable nominal diameter, were added to a Polyalphaolefin (PAO) base oil to evaluate tribological response in the boundary lubrication regime. The concentration of particles was fixed at 1% by weight for this study and different surfactants (Oleic acid, polyisobutylene succinimide) and dispersion methods were employed to determine the impact on agglomeration and the observed tribological response. The results showed that of the methods studied, adding 10 % Oleic acid (OA) while sonicating the particles for 30 minutes reduced the agglomeration the most and adding 1% Oleic acid while sonicating the particles for 120 minutes produced a more uniform dispersion. Furthermore, this study investigates the effect of the surface treatment of MoS2 and WS2 on their tribological behavior in boundary lubricant regime The nanoparticles were dispersed in Polyalphaolefin (PAO) using the following techniques: 1) 60 minutes sonication without using a stabilizing agent, 2) 60 minutes sonication with 1% of weight Oleic acid (OA), and 3) functionalizing the nanoparticles using polyvinylpyrrolidone. The size distribution of the dispersed nanoparticles in PAO was measured by dynamic light scattering. The nanoparticles functionalized using Polyvinylpyrrolidone resulted in the most stable particles size and homogeneous mixture dispersion. Friction studies show that the introduction of nanoparticles additives does not appreciably impact the friction of the interface for most cases in comparison to the base oil. Reciprocating wear experiments showed that the addition of nanoparticles without surfactants did not significantly increase the wear resistance compared to the base oil. Finally, this study investigates the dispersion techniques for CuO and WC nanoadditives on their effect on the rolling contact fatigue, using the best oil formulation that provided a stable suspension and agglomeration reduction for both materials. Tungsten carbide nanofluids showed the best micropitting resistantance behavior followed by copper oxide nanofluids under the boundary lubrication regime. Agglomeration reduction and homogeneous particles dispersion contribute to the wear reduction. The results of the friction and wear studies contributes to a better understanding of the tribological mechanism of the nanoadditives in base oil and clarify the difference between reducing agglomeration and improving dispersion. In this study, it is hypothesized that the additives might deposit on the surface and forming a physical tribofilm. In addition, if the nanoparticles fill the gaps between the surface roughness asperities which increase the true contact area, the particles can assist in movement like a nanoscale ball bearing. Depending upon the nanoparticles used, of evidence both mechanisms were found.

Subjects/Keywords: Agglomeration; Boundary lubrication; Lubricant Additives; Nanoparticles; Rolling Contact Fatigue; Sliding Wear; Materials Science and Engineering; Mechanics of Materials; Nanoscience and Nanotechnology

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Jazaa, Y. (2018). Effect of nanoparticle additives on the tribological behavior of oil under boundary lubrication. (Thesis). Iowa State University. Retrieved from https://lib.dr.iastate.edu/etd/16773

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Jazaa, Yosef. “Effect of nanoparticle additives on the tribological behavior of oil under boundary lubrication.” 2018. Thesis, Iowa State University. Accessed December 11, 2019. https://lib.dr.iastate.edu/etd/16773.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Jazaa, Yosef. “Effect of nanoparticle additives on the tribological behavior of oil under boundary lubrication.” 2018. Web. 11 Dec 2019.

Vancouver:

Jazaa Y. Effect of nanoparticle additives on the tribological behavior of oil under boundary lubrication. [Internet] [Thesis]. Iowa State University; 2018. [cited 2019 Dec 11]. Available from: https://lib.dr.iastate.edu/etd/16773.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Jazaa Y. Effect of nanoparticle additives on the tribological behavior of oil under boundary lubrication. [Thesis]. Iowa State University; 2018. Available from: https://lib.dr.iastate.edu/etd/16773

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Virginia Tech

17. Chatchaidech, Ratthaporn. Lubrication Forces in Polydimethylsiloxane (PDMS) Melts.

Degree: MS, Chemical Engineering, 2011, Virginia Tech

URL: http://hdl.handle.net/10919/34085

► The flow properties of polydimethylsiloxane (PDMS) melts at room temperature were studied by measurement of lubrication forces using an Atomic Force Microscopy (AFM) colloidal force… (more)

Subjects/Keywords: Solid-Liquid Interface; AFM; Polymer Melt; Chain Migration; No-slip Boundary Condition; Lubrication forces; Hydrodynamic forces

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Chatchaidech, R. (2011). Lubrication Forces in Polydimethylsiloxane (PDMS) Melts. (Masters Thesis). Virginia Tech. Retrieved from http://hdl.handle.net/10919/34085

Chicago Manual of Style (16^th Edition):

Chatchaidech, Ratthaporn. “Lubrication Forces in Polydimethylsiloxane (PDMS) Melts.” 2011. Masters Thesis, Virginia Tech. Accessed December 11, 2019. http://hdl.handle.net/10919/34085.

MLA Handbook (7^th Edition):

Chatchaidech, Ratthaporn. “Lubrication Forces in Polydimethylsiloxane (PDMS) Melts.” 2011. Web. 11 Dec 2019.

Vancouver:

Chatchaidech R. Lubrication Forces in Polydimethylsiloxane (PDMS) Melts. [Internet] [Masters thesis]. Virginia Tech; 2011. [cited 2019 Dec 11]. Available from: http://hdl.handle.net/10919/34085.

Council of Science Editors:

Chatchaidech R. Lubrication Forces in Polydimethylsiloxane (PDMS) Melts. [Masters Thesis]. Virginia Tech; 2011. Available from: http://hdl.handle.net/10919/34085

Iowa State University

18. Jenson, Alexander David-Arthur. The evolution of hardness and tribofilm growth during running-in of case carburized steel under boundary lubrication.

Degree: 2017, Iowa State University

URL: https://lib.dr.iastate.edu/etd/15326

► Many newly manufactured components are subject to a run-in procedure. It is commonly accepted that performing running-in at a fraction of the target load is… (more)

Subjects/Keywords: boundary lubrication; contact fatigue; running-in; tribology; work hardening; ZDDP; Materials Science and Engineering; Mechanical Engineering; Mechanics of Materials

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APA (6^th Edition):

Jenson, A. D. (2017). The evolution of hardness and tribofilm growth during running-in of case carburized steel under boundary lubrication. (Thesis). Iowa State University. Retrieved from https://lib.dr.iastate.edu/etd/15326

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Jenson, Alexander David-Arthur. “The evolution of hardness and tribofilm growth during running-in of case carburized steel under boundary lubrication.” 2017. Thesis, Iowa State University. Accessed December 11, 2019. https://lib.dr.iastate.edu/etd/15326.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Jenson, Alexander David-Arthur. “The evolution of hardness and tribofilm growth during running-in of case carburized steel under boundary lubrication.” 2017. Web. 11 Dec 2019.

Vancouver:

Jenson AD. The evolution of hardness and tribofilm growth during running-in of case carburized steel under boundary lubrication. [Internet] [Thesis]. Iowa State University; 2017. [cited 2019 Dec 11]. Available from: https://lib.dr.iastate.edu/etd/15326.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Jenson AD. The evolution of hardness and tribofilm growth during running-in of case carburized steel under boundary lubrication. [Thesis]. Iowa State University; 2017. Available from: https://lib.dr.iastate.edu/etd/15326

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

North Carolina State University

19. Song, Junlong. Adsorption of Amphoteric and Nonionic Polymers on Model Thin Films.

Degree: PhD, Wood and Paper Science, 2008, North Carolina State University

URL: http://www.lib.ncsu.edu/resolver/1840.16/4262

► Understanding the adsorption behaviors of polymers from solution is critical in applications such as fiber processing, specifically in the development of fiber bonding and lubrication.… (more)

▼ Understanding the adsorption behaviors of polymers from solution is critical in applications such as fiber processing, specifically in the development of fiber bonding and lubrication. Therefore, in situ and real time Quartz Crystal Microbalance and Surface Plasmon Resonance were employed to monitor the adsorption of hydrosoluble polymers (including amphoteric and nonionic macromolecules) on ultrathin films of cellulose, polypropylene, polyethylene, nylon and polyethylene terephthalate (typical paper and textile materials). The extent of adsorption of amphoteric polymers on cellulose (and also on silica) depended on the charge density of the substrate and pH of the medium. More importantly, the adsorbed amount exceeded that found in the case of simple polyelectrolytes. We hypothesized that this extensive adsorption is the result of a polarization effect produced by the charged substrate, which also determined the characteristics (thickness and viscoelastivcity) of the adsorbed layers as well as bonding abilities. Surface active polymers including diblock polyalkylene glycols and triblock polymers (based on ethylene- and propylene- oxide) as well as silicone surfactants were used to study the formation of boundary layers that are relevant in fiber lubrication. Adsorption isotherms for the nonionic polymers followed a Langmuirian behavior in which the hydrophobic effect was a major driving mechanism. The molecular mass of the polymer influenced markedly adsorption and, compared to typical hydrocarbon surfactants, silicone-based surfactants showed a higher surface activity and affinity with the tested hydrophobic surfaces. Lateral force microscopy and molecular dynamics simulation were used to illustrate boundary lubrication. It was concluded that surface-active molecules form robust self assembled (lubricant) layers that withstand high shear forces and are able to control friction and abrasion due to the unique molecular structures they form at the interface. Overall, it is anticipated that this thesis will contribute to the elucidation of the relationship between the structure and chemical nature of the adsorbing polymers and their respective interfacial behaviors. Advisors/Committee Members: Kirill Efimenko, Committee Member (advisor), Dimitris S. Argyropoulos, Committee Member (advisor), Martin A. Hubbe, Committee Member (advisor), Orlando J. Rojas, Committee Chair (advisor).

Subjects/Keywords: Nonionic polymers; Polyampholytes; Boundary lubrication; Silicone surfactants; Adsorption

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APA (6^th Edition):

Song, J. (2008). Adsorption of Amphoteric and Nonionic Polymers on Model Thin Films. (Doctoral Dissertation). North Carolina State University. Retrieved from http://www.lib.ncsu.edu/resolver/1840.16/4262

Chicago Manual of Style (16^th Edition):

Song, Junlong. “Adsorption of Amphoteric and Nonionic Polymers on Model Thin Films.” 2008. Doctoral Dissertation, North Carolina State University. Accessed December 11, 2019. http://www.lib.ncsu.edu/resolver/1840.16/4262.

MLA Handbook (7^th Edition):

Song, Junlong. “Adsorption of Amphoteric and Nonionic Polymers on Model Thin Films.” 2008. Web. 11 Dec 2019.

Vancouver:

Song J. Adsorption of Amphoteric and Nonionic Polymers on Model Thin Films. [Internet] [Doctoral dissertation]. North Carolina State University; 2008. [cited 2019 Dec 11]. Available from: http://www.lib.ncsu.edu/resolver/1840.16/4262.

Council of Science Editors:

Song J. Adsorption of Amphoteric and Nonionic Polymers on Model Thin Films. [Doctoral Dissertation]. North Carolina State University; 2008. Available from: http://www.lib.ncsu.edu/resolver/1840.16/4262

New Jersey Institute of Technology

20. Titov, Andriy. Effect of fullerene containing lubricants on wear resistance of machine components in boundary lubrication.

Degree: PhD, Mechanical Engineering, 2003, New Jersey Institute of Technology

URL: https://digitalcommons.njit.edu/dissertations/613

► Fullerenes, a new form of carbon nanomaterials, possess unique physical and mechanical properties that make their use as additives to liquid lubricants potentially beneficial.… (more)

Subjects/Keywords: Fullerenes; Wear; Friction; Lubricant; Boundary lubrication; Carbon; Mechanical Engineering

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APA (6^th Edition):

Titov, A. (2003). Effect of fullerene containing lubricants on wear resistance of machine components in boundary lubrication. (Doctoral Dissertation). New Jersey Institute of Technology. Retrieved from https://digitalcommons.njit.edu/dissertations/613

Chicago Manual of Style (16^th Edition):

Titov, Andriy. “Effect of fullerene containing lubricants on wear resistance of machine components in boundary lubrication.” 2003. Doctoral Dissertation, New Jersey Institute of Technology. Accessed December 11, 2019. https://digitalcommons.njit.edu/dissertations/613.

MLA Handbook (7^th Edition):

Titov, Andriy. “Effect of fullerene containing lubricants on wear resistance of machine components in boundary lubrication.” 2003. Web. 11 Dec 2019.

Vancouver:

Titov A. Effect of fullerene containing lubricants on wear resistance of machine components in boundary lubrication. [Internet] [Doctoral dissertation]. New Jersey Institute of Technology; 2003. [cited 2019 Dec 11]. Available from: https://digitalcommons.njit.edu/dissertations/613.

Council of Science Editors:

Titov A. Effect of fullerene containing lubricants on wear resistance of machine components in boundary lubrication. [Doctoral Dissertation]. New Jersey Institute of Technology; 2003. Available from: https://digitalcommons.njit.edu/dissertations/613

Brno University of Technology

21. Súkeník, Juraj. Vliv mazivostních přísad na snižování opotřebení třecích povrchů .

Degree: 2010, Brno University of Technology

URL: http://hdl.handle.net/11012/14813

► Mazivostné prísady tvoria neoddeliteľnú súčasť moderných mazív. V oblasti medzného mazania zohrávajú nezastupiteľnú úlohu mazivostné prísady nazývané polymérne modifikátory viskozity. Tie sú určené k zabezpečeniu… (more)

Subjects/Keywords: Medzné mazanie; polymérny modifikátor viskozity; eliptický kontakt; hrúbka mazacieho filmu; Boundary lubrication; viscosity index improvers; elliptical contact; lubricant film thickness

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APA (6^th Edition):

Súkeník, J. (2010). Vliv mazivostních přísad na snižování opotřebení třecích povrchů . (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/14813

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Súkeník, Juraj. “Vliv mazivostních přísad na snižování opotřebení třecích povrchů .” 2010. Thesis, Brno University of Technology. Accessed December 11, 2019. http://hdl.handle.net/11012/14813.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Súkeník, Juraj. “Vliv mazivostních přísad na snižování opotřebení třecích povrchů .” 2010. Web. 11 Dec 2019.

Vancouver:

Súkeník J. Vliv mazivostních přísad na snižování opotřebení třecích povrchů . [Internet] [Thesis]. Brno University of Technology; 2010. [cited 2019 Dec 11]. Available from: http://hdl.handle.net/11012/14813.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Súkeník J. Vliv mazivostních přísad na snižování opotřebení třecích povrchů . [Thesis]. Brno University of Technology; 2010. Available from: http://hdl.handle.net/11012/14813

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Indian Institute of Science

22. Devaprakasam, D. Studies Of Thermal, Nanomechanical And Tribological Characteristics Of Perfluoroalkyl Silanes Self Assembled On Aluminum Surfaces.

Degree: 2005, Indian Institute of Science

URL: http://hdl.handle.net/2005/1363

Subjects/Keywords: Lubrication; Aluminium Surfaces - Lubrication; Perfluoroalkyl Silane; Polycrystalline Aluminum Surface; Self Assembled Monolayers; Monomolecular Layer; Boundary Lubrication; Tribology

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APA (6^th Edition):

Devaprakasam, D. (2005). Studies Of Thermal, Nanomechanical And Tribological Characteristics Of Perfluoroalkyl Silanes Self Assembled On Aluminum Surfaces. (Thesis). Indian Institute of Science. Retrieved from http://hdl.handle.net/2005/1363

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Devaprakasam, D. “Studies Of Thermal, Nanomechanical And Tribological Characteristics Of Perfluoroalkyl Silanes Self Assembled On Aluminum Surfaces.” 2005. Thesis, Indian Institute of Science. Accessed December 11, 2019. http://hdl.handle.net/2005/1363.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Devaprakasam, D. “Studies Of Thermal, Nanomechanical And Tribological Characteristics Of Perfluoroalkyl Silanes Self Assembled On Aluminum Surfaces.” 2005. Web. 11 Dec 2019.

Vancouver:

Devaprakasam D. Studies Of Thermal, Nanomechanical And Tribological Characteristics Of Perfluoroalkyl Silanes Self Assembled On Aluminum Surfaces. [Internet] [Thesis]. Indian Institute of Science; 2005. [cited 2019 Dec 11]. Available from: http://hdl.handle.net/2005/1363.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Devaprakasam D. Studies Of Thermal, Nanomechanical And Tribological Characteristics Of Perfluoroalkyl Silanes Self Assembled On Aluminum Surfaces. [Thesis]. Indian Institute of Science; 2005. Available from: http://hdl.handle.net/2005/1363

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Indian Institute of Science

23. Devaprakasam, D. Studies Of Thermal, Nanomechanical And Tribological Characteristics Of Perfluoroalkyl Silanes Self Assembled On Aluminum Surfaces.

Degree: 2005, Indian Institute of Science

URL: http://etd.iisc.ernet.in/handle/2005/1363 ; http://etd.ncsi.iisc.ernet.in/abstracts/1766/G19581-Abs.pdf

Subjects/Keywords: Lubrication; Aluminium Surfaces - Lubrication; Perfluoroalkyl Silane; Polycrystalline Aluminum Surface; Self Assembled Monolayers; Monomolecular Layer; Boundary Lubrication; Tribology

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APA (6^th Edition):

Devaprakasam, D. (2005). Studies Of Thermal, Nanomechanical And Tribological Characteristics Of Perfluoroalkyl Silanes Self Assembled On Aluminum Surfaces. (Thesis). Indian Institute of Science. Retrieved from http://etd.iisc.ernet.in/handle/2005/1363 ; http://etd.ncsi.iisc.ernet.in/abstracts/1766/G19581-Abs.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Devaprakasam, D. “Studies Of Thermal, Nanomechanical And Tribological Characteristics Of Perfluoroalkyl Silanes Self Assembled On Aluminum Surfaces.” 2005. Thesis, Indian Institute of Science. Accessed December 11, 2019. http://etd.iisc.ernet.in/handle/2005/1363 ; http://etd.ncsi.iisc.ernet.in/abstracts/1766/G19581-Abs.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Devaprakasam, D. “Studies Of Thermal, Nanomechanical And Tribological Characteristics Of Perfluoroalkyl Silanes Self Assembled On Aluminum Surfaces.” 2005. Web. 11 Dec 2019.

Vancouver:

Devaprakasam D. Studies Of Thermal, Nanomechanical And Tribological Characteristics Of Perfluoroalkyl Silanes Self Assembled On Aluminum Surfaces. [Internet] [Thesis]. Indian Institute of Science; 2005. [cited 2019 Dec 11]. Available from: http://etd.iisc.ernet.in/handle/2005/1363 ; http://etd.ncsi.iisc.ernet.in/abstracts/1766/G19581-Abs.pdf.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Devaprakasam D. Studies Of Thermal, Nanomechanical And Tribological Characteristics Of Perfluoroalkyl Silanes Self Assembled On Aluminum Surfaces. [Thesis]. Indian Institute of Science; 2005. Available from: http://etd.iisc.ernet.in/handle/2005/1363 ; http://etd.ncsi.iisc.ernet.in/abstracts/1766/G19581-Abs.pdf

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

24. Faraon, Irinel Cosmin. Mixed Lubricated Line Contacts.

Degree: 2005, University of Twente

URL: https://research.utwente.nl/en/publications/mixed-lubricated-line-contacts(3cd5edb3-ac4e-401d-a988-0ee54c80fa21).html ; urn:nbn:nl:ui:28-50853 ; 3cd5edb3-ac4e-401d-a988-0ee54c80fa21 ; urn:isbn:90-365-2280-3 ; urn:nbn:nl:ui:28-50853 ; https://research.utwente.nl/en/publications/mixed-lubricated-line-contacts(3cd5edb3-ac4e-401d-a988-0ee54c80fa21).html

► The present work deals with friction in mixed lubricated line contacts. Components in systems are becoming smaller and due to, for instance power transmitted, partial… (more)

Subjects/Keywords: METIS-225249; IR-50853; Stribeck curve; Mixed lubrication; Boundary lubrication; Film thickness; Starved lubrication; Shear thinning; Statistic contact model; Deterministic contact model

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APA (6^th Edition):

Faraon, I. C. (2005). Mixed Lubricated Line Contacts. (Doctoral Dissertation). University of Twente. Retrieved from https://research.utwente.nl/en/publications/mixed-lubricated-line-contacts(3cd5edb3-ac4e-401d-a988-0ee54c80fa21).html ; urn:nbn:nl:ui:28-50853 ; 3cd5edb3-ac4e-401d-a988-0ee54c80fa21 ; urn:isbn:90-365-2280-3 ; urn:nbn:nl:ui:28-50853 ; https://research.utwente.nl/en/publications/mixed-lubricated-line-contacts(3cd5edb3-ac4e-401d-a988-0ee54c80fa21).html

Chicago Manual of Style (16^th Edition):

Faraon, Irinel Cosmin. “Mixed Lubricated Line Contacts.” 2005. Doctoral Dissertation, University of Twente. Accessed December 11, 2019. https://research.utwente.nl/en/publications/mixed-lubricated-line-contacts(3cd5edb3-ac4e-401d-a988-0ee54c80fa21).html ; urn:nbn:nl:ui:28-50853 ; 3cd5edb3-ac4e-401d-a988-0ee54c80fa21 ; urn:isbn:90-365-2280-3 ; urn:nbn:nl:ui:28-50853 ; https://research.utwente.nl/en/publications/mixed-lubricated-line-contacts(3cd5edb3-ac4e-401d-a988-0ee54c80fa21).html.

MLA Handbook (7^th Edition):

Faraon, Irinel Cosmin. “Mixed Lubricated Line Contacts.” 2005. Web. 11 Dec 2019.

Vancouver:

Faraon IC. Mixed Lubricated Line Contacts. [Internet] [Doctoral dissertation]. University of Twente; 2005. [cited 2019 Dec 11]. Available from: https://research.utwente.nl/en/publications/mixed-lubricated-line-contacts(3cd5edb3-ac4e-401d-a988-0ee54c80fa21).html ; urn:nbn:nl:ui:28-50853 ; 3cd5edb3-ac4e-401d-a988-0ee54c80fa21 ; urn:isbn:90-365-2280-3 ; urn:nbn:nl:ui:28-50853 ; https://research.utwente.nl/en/publications/mixed-lubricated-line-contacts(3cd5edb3-ac4e-401d-a988-0ee54c80fa21).html.

Council of Science Editors:

Faraon IC. Mixed Lubricated Line Contacts. [Doctoral Dissertation]. University of Twente; 2005. Available from: https://research.utwente.nl/en/publications/mixed-lubricated-line-contacts(3cd5edb3-ac4e-401d-a988-0ee54c80fa21).html ; urn:nbn:nl:ui:28-50853 ; 3cd5edb3-ac4e-401d-a988-0ee54c80fa21 ; urn:isbn:90-365-2280-3 ; urn:nbn:nl:ui:28-50853 ; https://research.utwente.nl/en/publications/mixed-lubricated-line-contacts(3cd5edb3-ac4e-401d-a988-0ee54c80fa21).html

25. Su, Jun Feng. Investigation of metallurgical coatings for automotive applications.

Degree: PhD, Mechanical, Automotive, and Materials Engineering, 2014, University of Windsor

URL: https://scholar.uwindsor.ca/etd/5104

► Metallurgical coatings have been widely used in the automotive industry from component machining, engine daily running to body decoration due to their high hardness,… (more)

▼ Metallurgical coatings have been widely used in the automotive industry from component machining, engine daily running to body decoration due to their high hardness, wear resistance, corrosion resistance and low friction coefficient. With high demands in energy saving, weight reduction and limiting environmental impact, the use of new materials such as light Aluminum/magnesium alloys with high strength-weight ratio for engine block and advanced high-strength steel (AHSS) with better performance in crash energy management for die stamping, are increasing. However, challenges are emerging when these new materials are applied such as the wear of the relative soft light alloys and machining tools for hard AHSS. The protective metallurgical coatings are the best option to profit from these new materials' advantages without altering largely in mass production equipments, machinery, tools and human labor. In this dissertation, a plasma electrolytic oxidation (PEO) coating processing on aluminum alloys was introduced in engine cylinder bores to resist wear and corrosion. The tribological behavior of the PEO coatings under boundary and starve lubrication conditions was studied experimentally and numerically for the first time. Experimental results of the PEO coating demonstrated prominent wear resistance and low friction, taking into account the extreme working conditions. The numerical elastohydrodynamic lubrication (EHL) and asperity contact based tribological study also showed a promising approach on designing low friction and high wear resistant PEO coatings. Other than the fabrication of the new coatings, a novel coating evaluation methodology, namely, inclined impact sliding tester was presented in the second part of this dissertation. This methodology has been developed and applied in testing and analyzing physical vapor deposition (PVD)/ chemical vapor deposition (CVD)/PEO coatings. Failure mechanisms of these common metallurgical hard coatings were systematically studied and summarized via the new testing methodology. Field tests based on the new coating characterization technique proved that this methodology is reliable, effective and economical. Advisors/Committee Members: Hu, Henry.

Subjects/Keywords: Applied sciences; Boundary/mixed lubrication; Inclinde impact-sliding test; Lubrication simulation; Metallurgical coating; Plasmas electrolytic oxidation

…53 x 3.1.1 PTWA: boundary lubrication vs. starve lubrication… …53 3.1.2 PEO S1: boundary lubrication vs. starve lubrication… …57 3.1.4 PEO S2: boundary lubrication vs. starve lubrication… …69 CHAPTER 3 NUMERICAL SIMULATION OF BOUNDARY/MIXED LUBRICATION OF PLASMA ELETROLYTIC… …steel balls sliding against coated samples under boundary lubrication (solid lines)…

10 more images…

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APA (6^th Edition):

Su, J. F. (2014). Investigation of metallurgical coatings for automotive applications. (Doctoral Dissertation). University of Windsor. Retrieved from https://scholar.uwindsor.ca/etd/5104

Chicago Manual of Style (16^th Edition):

Su, Jun Feng. “Investigation of metallurgical coatings for automotive applications.” 2014. Doctoral Dissertation, University of Windsor. Accessed December 11, 2019. https://scholar.uwindsor.ca/etd/5104.

MLA Handbook (7^th Edition):

Su, Jun Feng. “Investigation of metallurgical coatings for automotive applications.” 2014. Web. 11 Dec 2019.

Vancouver:

Su JF. Investigation of metallurgical coatings for automotive applications. [Internet] [Doctoral dissertation]. University of Windsor; 2014. [cited 2019 Dec 11]. Available from: https://scholar.uwindsor.ca/etd/5104.

Council of Science Editors:

Su JF. Investigation of metallurgical coatings for automotive applications. [Doctoral Dissertation]. University of Windsor; 2014. Available from: https://scholar.uwindsor.ca/etd/5104

26. Bonaventure, Julien. Influence of random surface roughness on friction in elastohydrodynamic, mixed and boundary lubrication : venoms animals as research tools and identification of new therapeutic compounds.

Degree: Docteur es, Mécanique, 2017, Lyon

URL: http://www.theses.fr/2017LYSEC038

► La plupart des systèmes mécaniques contiennent des contacts lubrifiés (articulations, roulements, ...) qui sont soumis à des efforts importants. Dans ce travail expérimental, on s’intéresse… (more)

▼ La plupart des systèmes mécaniques contiennent des contacts lubrifiés (articulations, roulements, ...) qui sont soumis à des efforts importants. Dans ce travail expérimental, on s’intéresse à l’influence de la rugosité sur la friction dans les régimes de lubrification élastohydrodynamique (EHD), mixte, et limite dans des conditions représentatives des contacts dans un moteur de voiture. Les surfaces utilisées dans ce travail sont principalement des aciers usinés industriellement, revêtus ou non de Diamond-Like Carbon (DLC). La force de friction dans les régimes mixte et limite étant bien plus importante qu’en régime EHD, il est important de pouvoir prédire les transitions d’un régime à l’autre. Le problème est que la rugosité affecte significativement les vitesses de transition entre ces régimes, de telle manière qu’il est difficile de prédire le régime de fonctionnement d’un couple donné de surfaces. Les travaux expérimentaux s’attardant sur ce problème sont rares, et les tentatives théoriques d’inclure l’effet de rugosités aléatoires reposent sur des paramètres difficiles à mesurer à cause de leur grande dépendance vis-à-vis des conditions de filtrage, d’échantillonnage, et de leur non-stationnarité. à partir de nombreuses mesures topograhiques (interférométrie et AFM), une méthode assurant la représentativité des paramètres statistiques de rugosité est donc d’abord mise en œuvre pour caractériser des surfaces dont la rugosité va du nanomètre au micron. Des expériences de Stribeck sont ensuite menées avec ces surfaces afin de corréler leur signature morphologique à leur comportement en friction. La rhéologie sous pression de lubrifiants (poly-α oléfines) est mesurée dans un contact lisse en fonction de la pression et de la température, ce qui permet de prédire quantitativement la friction en régime élastohydrodynamique pour tout couple de surfaces, mais aussi de définir un critère non phénoménologique d’entrée en régime de lubrification mixte. à haute vitesse d’entraînement, la contrainte visqueuse décroît avec le taux de cisaillement ce qui est traditionnellement attribué à un échauffement du lubrifiant. On montre que les effets thermiques ne peuvent expliquer une telle chute et on l’explique par l’étalement du profil de pression dans le convergent, phénomène significatif quand l’épaisseur de lubrifiant devient de l’ordre d’un dixième de la taille du contact. Les résultats montrent que le produit de la viscosité dans le convergent avec la vitesse d’entraînement à la transition mixte-EHD suit une loi de puissance super-linéaire avec la rugosité, tous matériaux confondus, ce qui permet de prédire cette transition en fonction de la rugosité. La transition entre régimes mixte et limite est plus complexe et laisse apparaître un comportement clairement différent entre les contacts DLC/DLC et les contacts mettant en jeu au moins une surface d’acier. Pour les contacts DLC/DLC, la friction en régime limite correspond au cisaillement plastique du lubrifiant, ce qui explique que la rugosité n’affecte pas le frottement limite… Advisors/Committee Members: Cayer-Barrioz, Juliette (thesis director), Mazuyer, Denis (thesis director).

Subjects/Keywords: Friction; Lubrification Elastohydrodynamique; Mixte et Limite; Courbe de Stribeck; Rugosité Aléatoire; Caractérisation Multi-échelle de Surface; Friction; Elastohydrodynamic; Mixed and Boundary Lubrication; Stribeck Curve; Random Roughness; Multi-Scale Surface Characterization

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APA (6^th Edition):

Bonaventure, J. (2017). Influence of random surface roughness on friction in elastohydrodynamic, mixed and boundary lubrication : venoms animals as research tools and identification of new therapeutic compounds. (Doctoral Dissertation). Lyon. Retrieved from http://www.theses.fr/2017LYSEC038

Chicago Manual of Style (16^th Edition):

Bonaventure, Julien. “Influence of random surface roughness on friction in elastohydrodynamic, mixed and boundary lubrication : venoms animals as research tools and identification of new therapeutic compounds.” 2017. Doctoral Dissertation, Lyon. Accessed December 11, 2019. http://www.theses.fr/2017LYSEC038.

MLA Handbook (7^th Edition):

Bonaventure, Julien. “Influence of random surface roughness on friction in elastohydrodynamic, mixed and boundary lubrication : venoms animals as research tools and identification of new therapeutic compounds.” 2017. Web. 11 Dec 2019.

Vancouver:

Bonaventure J. Influence of random surface roughness on friction in elastohydrodynamic, mixed and boundary lubrication : venoms animals as research tools and identification of new therapeutic compounds. [Internet] [Doctoral dissertation]. Lyon; 2017. [cited 2019 Dec 11]. Available from: http://www.theses.fr/2017LYSEC038.

Council of Science Editors:

Bonaventure J. Influence of random surface roughness on friction in elastohydrodynamic, mixed and boundary lubrication : venoms animals as research tools and identification of new therapeutic compounds. [Doctoral Dissertation]. Lyon; 2017. Available from: http://www.theses.fr/2017LYSEC038

Penn State University

27. Zhang, Huan. A DETERMINISTIC-STATISTICAL MODEL FOR TRIBO-CONTACTS IN BOUNDARY LUBRICATION WITH LUBRICANT/SURFACE PHYSICOCHEMISTRY.

Degree: PhD, Mechanical Engineering, 2004, Penn State University

URL: https://etda.libraries.psu.edu/catalog/6484

► The boundary-lubricated surface contact is truly an interdisciplinary process involving deformation, heat transfer, physicochemical interaction, and random-process probability. The objective of this thesis is to… (more)

▼ The boundary-lubricated surface contact is truly an interdisciplinary process involving deformation, heat transfer, physicochemical interaction, and random-process probability. The objective of this thesis is to develop a surface contact model as a theoretical platform upon which to carry out the boundary lubrication research with a balanced consideration of all the four key aspects of the contact process. The modeling consists of three successive steps – (1) elastoplastic finite element analysis of frictional asperity contacts, (2) modeling of contact systems with friction, and (3) modeling of a boundary lubrication process. Finite element analysis of frictional asperity contacts – A finite element model is developed and systematic numerical analyses carried out to study the effects of friction on the deformation behavior of individual asperity contacts. The study reveals some insights into the modes of asperity deformation and asperity contact variables as functions of friction in the contact. The results provide guidance to analytical modeling of frictional asperity contacts and lay a foundation for subsequent work on system contact modeling. Modeling of contact systems with friction – Analytical equations are developed relating asperity-contact variables to friction using contact-mechanics theories in conjunction with the finite element results. A system-level model is then derived from the statistical integration of the asperity-level equations. The model is a significant advancement of the Greenwood-Williamson types of system models by incorporating contact friction. It also serves as the platform in the final step of model development for the boundary lubrication problem. Modeling of a boundary lubrication process – On the basis of the above mechanical modeling, an asperity-based model is developed for the boundary-lubricated contact by incorporating other key aspects involved in the process. Four variables are used to describe an asperity contact under boundary lubrication conditions, including micro-contact area, friction force, load carrying capacity and flash temperature. In addition, three probability variables are used to define the interfacial state of an asperity junction that may be covered by various types of boundary films. Governing equations for the seven key asperity-level variables are derived based on first-principle considerations of asperity deformation, frictional heating, and formation/removal of boundary lubricating films. These coupled asperity-level equations, some of which are nonlinear, are solved iteratively and the solution is then statistically integrated to formulate the contact model for boundary lubrication systems. The results obtained from the model suggest that it may provide a framework for future investigation of the boundary lubrication process by integrating research advances in contact mechanics, tribochemistry, and other related fields.

Subjects/Keywords: Boundary Lubrication; Contact Mechanics; Physicochemistry; Statistical Surface Model; Frictional Modeling

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Zhang, H. (2004). A DETERMINISTIC-STATISTICAL MODEL FOR TRIBO-CONTACTS IN BOUNDARY LUBRICATION WITH LUBRICANT/SURFACE PHYSICOCHEMISTRY. (Doctoral Dissertation). Penn State University. Retrieved from https://etda.libraries.psu.edu/catalog/6484

Chicago Manual of Style (16^th Edition):

Zhang, Huan. “A DETERMINISTIC-STATISTICAL MODEL FOR TRIBO-CONTACTS IN BOUNDARY LUBRICATION WITH LUBRICANT/SURFACE PHYSICOCHEMISTRY.” 2004. Doctoral Dissertation, Penn State University. Accessed December 11, 2019. https://etda.libraries.psu.edu/catalog/6484.

MLA Handbook (7^th Edition):

Zhang, Huan. “A DETERMINISTIC-STATISTICAL MODEL FOR TRIBO-CONTACTS IN BOUNDARY LUBRICATION WITH LUBRICANT/SURFACE PHYSICOCHEMISTRY.” 2004. Web. 11 Dec 2019.

Vancouver:

Zhang H. A DETERMINISTIC-STATISTICAL MODEL FOR TRIBO-CONTACTS IN BOUNDARY LUBRICATION WITH LUBRICANT/SURFACE PHYSICOCHEMISTRY. [Internet] [Doctoral dissertation]. Penn State University; 2004. [cited 2019 Dec 11]. Available from: https://etda.libraries.psu.edu/catalog/6484.

Council of Science Editors:

Zhang H. A DETERMINISTIC-STATISTICAL MODEL FOR TRIBO-CONTACTS IN BOUNDARY LUBRICATION WITH LUBRICANT/SURFACE PHYSICOCHEMISTRY. [Doctoral Dissertation]. Penn State University; 2004. Available from: https://etda.libraries.psu.edu/catalog/6484

North Carolina State University

28. Neeyakorn, Worakarn. Interfacial Slippage and Fricion Studies on Material of Interest to Microelectromechanical Systems (MEMS).

Degree: PhD, Physics, 2006, North Carolina State University

URL: http://www.lib.ncsu.edu/resolver/1840.16/5603

► I have studied the water vapor adsorption onto quartz crystal microbalance crystals in different type of gas surrounding. The noble gas alone has no charge… (more)

Subjects/Keywords: Nanotribology; No Slip Boundary Condition; Lubrication; Vapor Phase Lubricant; MEMS; QCM

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Neeyakorn, W. (2006). Interfacial Slippage and Fricion Studies on Material of Interest to Microelectromechanical Systems (MEMS). (Doctoral Dissertation). North Carolina State University. Retrieved from http://www.lib.ncsu.edu/resolver/1840.16/5603

Chicago Manual of Style (16^th Edition):

Neeyakorn, Worakarn. “Interfacial Slippage and Fricion Studies on Material of Interest to Microelectromechanical Systems (MEMS).” 2006. Doctoral Dissertation, North Carolina State University. Accessed December 11, 2019. http://www.lib.ncsu.edu/resolver/1840.16/5603.

MLA Handbook (7^th Edition):

Neeyakorn, Worakarn. “Interfacial Slippage and Fricion Studies on Material of Interest to Microelectromechanical Systems (MEMS).” 2006. Web. 11 Dec 2019.

Vancouver:

Neeyakorn W. Interfacial Slippage and Fricion Studies on Material of Interest to Microelectromechanical Systems (MEMS). [Internet] [Doctoral dissertation]. North Carolina State University; 2006. [cited 2019 Dec 11]. Available from: http://www.lib.ncsu.edu/resolver/1840.16/5603.

Council of Science Editors:

Neeyakorn W. Interfacial Slippage and Fricion Studies on Material of Interest to Microelectromechanical Systems (MEMS). [Doctoral Dissertation]. North Carolina State University; 2006. Available from: http://www.lib.ncsu.edu/resolver/1840.16/5603

Brno University of Technology

29. Krejčí, Tomáš. Mazání vznětových a zážehových motorů .

Degree: 2008, Brno University of Technology

URL: http://hdl.handle.net/11012/997

► Tato bakalářská práce se zabývá rešerší současného stavu poznání v oblasti mazání vznětových a zážehových motorů, maziv a vymezením trendů. V první části naleznete obecné… (more)

Subjects/Keywords: vznětový motor; zážehový motor; vnitřní spalování; olejové hospodářství; mazání; mezné tření; hydrodynamické tření; motorové oleje; aditiva; compression-ignition engine; spark-ignition engine; internal combustion; engine lubrication system; lubricating; boundary lubrication; hydrodynamic lubrication; oils; additives

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Krejčí, T. (2008). Mazání vznětových a zážehových motorů . (Thesis). Brno University of Technology. Retrieved from http://hdl.handle.net/11012/997

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16^th Edition):

Krejčí, Tomáš. “Mazání vznětových a zážehových motorů .” 2008. Thesis, Brno University of Technology. Accessed December 11, 2019. http://hdl.handle.net/11012/997.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7^th Edition):

Krejčí, Tomáš. “Mazání vznětových a zážehových motorů .” 2008. Web. 11 Dec 2019.

Vancouver:

Krejčí T. Mazání vznětových a zážehových motorů . [Internet] [Thesis]. Brno University of Technology; 2008. [cited 2019 Dec 11]. Available from: http://hdl.handle.net/11012/997.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Krejčí T. Mazání vznětových a zážehových motorů . [Thesis]. Brno University of Technology; 2008. Available from: http://hdl.handle.net/11012/997

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

University of Florida

30. Nguyen, Nhan Quyen ( Dissertant ). Sedimentation of hard sphere suspensions at low Reynolds number ssing a lattice-Boltzmann method.

Degree: PhD, Chemical Engineering, 2004, University of Florida

URL: http://ufdc.ufl.edu/UFE0006486

► Particle motion in a settling suspension is directly influenced by hydrodynamic interactions, such that the particle velocities will exhibit a random component, characterized by a… (more)

Subjects/Keywords: Boundary conditions; Hydrodynamics; Lubrication; Material concentration; Particle interactions; Reynolds number; Simulations; Suspensions; Velocity; Viscosity

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APA · Chicago · MLA · Vancouver · CSE | Export to Zotero / EndNote / Reference Manager

APA (6^th Edition):

Nguyen, N. Q. (. D. ). (2004). Sedimentation of hard sphere suspensions at low Reynolds number ssing a lattice-Boltzmann method. (Doctoral Dissertation). University of Florida. Retrieved from http://ufdc.ufl.edu/UFE0006486

Chicago Manual of Style (16^th Edition):

Nguyen, Nhan Quyen ( Dissertant ). “Sedimentation of hard sphere suspensions at low Reynolds number ssing a lattice-Boltzmann method.” 2004. Doctoral Dissertation, University of Florida. Accessed December 11, 2019. http://ufdc.ufl.edu/UFE0006486.

MLA Handbook (7^th Edition):

Nguyen, Nhan Quyen ( Dissertant ). “Sedimentation of hard sphere suspensions at low Reynolds number ssing a lattice-Boltzmann method.” 2004. Web. 11 Dec 2019.

Vancouver:

Nguyen NQ(D). Sedimentation of hard sphere suspensions at low Reynolds number ssing a lattice-Boltzmann method. [Internet] [Doctoral dissertation]. University of Florida; 2004. [cited 2019 Dec 11]. Available from: http://ufdc.ufl.edu/UFE0006486.

Council of Science Editors:

Nguyen NQ(D). Sedimentation of hard sphere suspensions at low Reynolds number ssing a lattice-Boltzmann method. [Doctoral Dissertation]. University of Florida; 2004. Available from: http://ufdc.ufl.edu/UFE0006486

Open Access Theses and Dissertations