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Tesi sul tema "Friction"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 25 luglio 2025

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1

Ledezma, Rodríguez Javier Andre. "Technology progress, credit market frictions and labor market friction." Tesis, Universidad de Chile, 2014. http://www.repositorio.uchile.cl/handle/2250/117059.

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Magíster en Economía Aplicada<br>Este trabajo modela la interacción entre progreso tecnológico (PT), fricciones en el mercado laboral y fricciones en el mercado del crédito, con el objetivo de estudiar cómo la respuesta del mercado laboral frente al aumento del PT se encuentra mediada por el grado de desarrollo del mercado del crédito. La hipótesis principal apunta al hecho que economías con fricciones en el mercado del crédito responden de manera diferente al PT que aquellas economías sin fricciones en dicho mercado, lo que determinaría finalmente el efecto sobre el mercado laboral. Acemoglu

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2

Stratton, Daryl A. "Characterizing the Frictional Interface in Friction Stir Welding." Diss., CLICK HERE for online access, 2007. http://contentdm.lib.byu.edu/ETD/image/etd1757.pdf.

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3

Omam, Alan Frederic. "Internal friction." Bachelor's thesis, Alma Mater Studiorum - Università di Bologna, 2020.

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Abstract (sommario):

The phenomenon of internal friction most generally defined as the dissipation of mechanical energy inside a gaseous, liquid or solid medium. It is basically different from “friction” in the tribological sense, i.e., the resistance against the motion of two solid surfaces relative to each other (“external friction”).

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4

Roa, Julio Alberto. "Evaluation of International Friction Index and High-Friction Surfaces." Thesis, Virginia Tech, 2008. http://hdl.handle.net/10919/36277.

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State highway agencies have an obligation to provide users with optimal surface conditions under various weather conditions throughout the year. A satisfactory pavement surface should exhibit good friction and texture depth to reduce roadway highway accidents. This is why friction is starting to receive increased attention in the pavement management process. There have been numerous research efforts by different countries and agencies to better understand the behavior of different friction testing devices and the influence of texture, speed, and other external conditions on their measurement

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5

Hu, Yuan. "Friction-Stir Riveting: Mechanical Testing of Friction-Stir Riveting." University of Toledo / OhioLINK, 2015. http://rave.ohiolink.edu/etdc/view?acc_num=toledo1430393133.

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6

REDDA, BOYNA ROHITH. "IMPACT OF FRICTION TEST SCALE ON BRAKE FRICTION PERFORMANCE." OpenSIUC, 2016. https://opensiuc.lib.siu.edu/theses/2051.

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It is well known that the friction performance is a system property. The coefficient of friction and its stability, wear rate and the propensity to vibration and noise are always characteristics of a system and it is not easy to predict their performance based on smaller scale friction tests. This paper discusses the relation between performances of different-scale testers and possibility to model the friction performance of real systems in small simpler testers. It addressed the application of “scaling laws,” the application of typically adopted scaling strategies in friction industry and the

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7

Kietzig, Anne-Marie. "Microscopic ice friction." Thesis, University of British Columbia, 2010. http://hdl.handle.net/2429/23322.

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Microscopic ice friction was studied systematically across all to ice friction relevant friction regimes using several metallic interfaces. A rheometer with a newly designed fixture for friction measurements was used in these studies. The investigations focus on the influence of material properties, such as surface wettability, roughness, surface structure, surface nanopatterning, and thermal conductivity. Using a femtosecond laser process certain dual scale roughness structures were created to mimic the lotus leaf on the surface of inherently hydrophilic metal alloys. After laser irradiation

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8

Chou, Danielle 1981. "Dahl friction modeling." Thesis, Massachusetts Institute of Technology, 2004. http://hdl.handle.net/1721.1/32826.

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Thesis (S.B.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 2004.<br>Includes bibliographical references (p. 22).<br>The drive behind improved friction models has been better prediction and control of dynamic systems. The earliest model was of classical Coulomb friction; however, the discontinuity during force reversal of the Coulomb friction model has long been a point of contention since such a discontinuity does not accurately portray the behavior of real systems. Other models have been suggested, but variations of the Dahl solid friction model remain some of the

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9

Gerde, Eric Stendahl. "Fracture and friction /." Full text (PDF) from UMI/Dissertation Abstracts International, 2001. http://wwwlib.umi.com/cr/utexas/fullcit?p3008334.

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10

Quignon, Benoit. "Investigations of the frictional behaviour of nanotextured surfaces by friction force microscopy." Thesis, University of Bristol, 2015. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.685551.

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Abstract (sommario):

Friction is omnipresent in our daily life, and although this phenomenon has been studied for centuries, the fundamental understanding on tribological processes as a whole is still lacking. Reducing friction is beneficial in many applications, from mediating wear to improving the life span of devices, hence improving our knowledge of the parameters affecting frictional forces is of paramount importance. In particular, the miniaturisation of modern devices implies that their reliability and durability become friction limited. Recent advances in the fabrication of nanostructured surfaces with tun

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11

Kuzmin, Leonid. "Interfacial kinetic ski friction." Doctoral thesis, Mittuniversitetet, Institutionen för teknik och hållbar utveckling, 2010. http://urn.kb.se/resolve?urn=urn:nbn:se:miun:diva-11525.

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It is no doubt, that the ski glide over the snow is a very complicated object of research. However, ski glide is just a one area of many other areas of human knowledge. As a rule, the scientists and practitioners, who work in these areas, operate with some publicly expressed more or less solid hypotheses. These researchers work with one hypothesis until another and a better one comes up. Our literature studies and our own observations regarding modern skis preparations, did not give us any solid hypotheses, which are able to explain the actual form and content of this procedure. The present wo

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12

Ujvari, Szerena Krisztina. "Journal Bearing Friction Optimization." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2016. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-60669.

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Engine downsizing, improving fuel efficiency while satisfying the environmental legislations are one of the main driving forces in developing new solutions for passenger cars.Engine main bearings, are journal bearings which support the crankshaft and operate principally in full film lubrication. Defining the optimum design parameters of the bearings which can provide low friction and high durability for automobiles represents a multi-variable problem.Being the supporters of the main shaft driven by the internal combustion engine, main bearings are subjected to strenuous operating conditions. T

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13

Sloan, Michael. "Eco-efficient friction materials." Thesis, University of Exeter, 2008. http://hdl.handle.net/10036/42237.

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Automotive friction materials are multi component composites in which fibrous materials play a fundamental role. Modern friction formulations have been developed around asbestos fibres, a heavily used material before legislation outlawed its use in the 1980’s. The replacement adopted by the friction industry was aramid, a high performance, high cost synthetic fibre. The work in this thesis investigates the role of aramid fibres in an economy friction material from the early mixing stages in manufacture using mechanical and optical analysis techniques through to the friction and wear performanc

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14

Gearing, Brian P. (Brian Paul) 1972. "Friction in sheet forming." Thesis, Massachusetts Institute of Technology, 1999. http://hdl.handle.net/1721.1/9413.

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15

Newby, William Robert. "Environmentally acceptable friction composites." Thesis, University of Exeter, 2014. http://hdl.handle.net/10871/15032.

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Currently, the production of most non-asbestos organic (NAO) friction materials depends on a long and energy intensive manufacturing process and an unsustainable supply of synthetic resins and fibres; it is both expensive and bad for the environment. In this research, a new, more energy efficient, manufacturing process was developed which makes use of a naturally derived resin and natural plant fibres. The new process is known as 'cold moulding' and is fundamentally different from the conventional method. It was used to develop a new brake pad for use in low temperature (<400 °C) applications,

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16

Torres, Josette Annmarie. "Bodies Degraded by Friction." Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/77491.

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Bodies Degraded by Friction is a collection of poetry existing in finite spaces. The first section, “A Moment and a Moment and a Moment," attempts to capture in words small passages of time as simple as clicking through a Facebook photo album and as destructive as new love. The second section, “It’s Complicated," is a manuscript in progress detailing a year in the life of an “other woman" negotiating an interpersonal relationship role underrepresented in self-help books and mass media. Several themes run throughout the book: the consequences of the use of technology-mediated communication as d

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17

Björling, Marcus. "Friction in Elastohydrodynamic Lubrication." Doctoral thesis, Luleå tekniska universitet, Maskinelement, 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-17478.

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Today, with increasing demands on industry to reduce energy consumption and emissions, the strive to increase the efficiency of machine components is maybe bigger than ever. This PhD thesis focus on friction in elastohydrodynamic lubrication (EHL), found in, among others, gears, bearings and cam followers. Friction in such contacts is governed by a complex interaction of material, surface and lubricant parameters as well as operating conditions. In this work, experimental studies have been conducted that show how friction varies over a wide range of running conditions when changing parameters

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18

Mahdi, Duale A. M. "Aspects of shaving friction." Thesis, University of Surrey, 2015. http://epubs.surrey.ac.uk/808507/.

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Shaving is an everyday act for many people and Gillette is at the forefront of this market. The complex process of designing a razor involves understanding the interaction between the cartridge and the face which are complicated systems in their own right. Wet shaving is a complex tribological process for which the mechanisms and parameters are not well understood. The time and high cost associated with designing razors are a major driving force for developing a technical model of shaving. Friction has been identified as an important parameter influencing consumer relevant attributes such glid

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19

Edmunds, Rorie. "Parallel folding with friction." Thesis, University of Bath, 2005. https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.412346.

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20

Clain-Burckbuchler, Juliette. "Friction sèche et mouillée." Paris 6, 2004. http://www.theses.fr/2004PA066383.

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21

Parkanyi, Tamas. "Rubber friction on ice : investigation of frictional heating and melt water film thickness." Thesis, University of Edinburgh, 2016. http://hdl.handle.net/1842/18751.

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Friction on ice is important for many different fields such as winter sports and vehicle traction. In vehicle handling, maximising the friction coefficient between tyres and the ice surface is key to safety. The friction coefficient between tyre rubber and ice has been observed to be as high as unity at low temperatures and as little as 0.05 close to the ice melting temperature. The observed low friction is due to thin water films generated through frictional heating. Little is known about the formation and behaviour of this fluid film and its thickness has been difficult to measure. Previous

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22

Najafi, Shahriar. "Evaluation of Continuous Friction Measuring Equipment (CFME) for Supporting Pavement Friction Management Programs." Thesis, Virginia Tech, 2010. http://hdl.handle.net/10919/51244.

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It is the responsibility of pavement engineers to design pavements that provide safe and smooth riding surfaces over their entire life cycle. Each year many people around the world lose their lives in vehicle crashes, which are one of the leading causes of death in the United States (US). One of the contributing factors in many of these crashes is inappropriate friction between tires and the pavement. To minimize the impact of this factor, state Departments of Transportation (DOTs) must monitor the friction of their pavement networks systematically and regularly. Several devices are used aroun

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23

Pereira, De Matos Rafael. "Molecular dynamics simulations of amine-based friction modifiers : diffusion, adsorption and friction behaviors." Thesis, Lyon, 2019. http://www.theses.fr/2019LYSEC013.

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Les amines grasses sont présentes dans la formulation de lubrifiants automobiles, en tant que modificateurs de frottement organiques (MFO), afin d'atténuer les effets négatifs entraînés par le frottement et l'usure induits au sein des pièces sujettes aux conditions limites (c'est-à-dire, sous haute pression et basse vitesse de glissement). Outre leurs propriétés de lubrification, ces additifs présentent l'avantage d'être compatibles avec les systèmes de dépollution des gaz d'échappement, puisque leur composition organique est exempte d'éléments nocifs, tels que le soufre, le phosphore et certa

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24

Satam, Sayali S. "Optimization of Wet Friction Systems Based on Rheological, Adsorption, Lubricant and Friction Material Characterization." University of Akron / OhioLINK, 2017. http://rave.ohiolink.edu/etdc/view?acc_num=akron1503358825451407.

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25

Raftari, Maryam. "Investigation of the frictional behaviour of end-grafted polymer layers using friction force microscopy." Thesis, University of Sheffield, 2014. http://etheses.whiterose.ac.uk/7001/.

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26

Cora, Omer Necati. "Friction Analysis In Cold Forging." Master's thesis, METU, 2004. http://etd.lib.metu.edu.tr/upload/12605674/index.pdf.

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Friction is one of the important parameters in metal forming processes since it affects metal flow in the die, forming load, strain distribution, tool and die life, surface quality of the product etc. The range of coefficient of friction in different metal forming applications is not well known and the factors affecting variation are ambiguous. Commercially available FEA packages input the coefficient of friction as constant among the whole process which is not a realistic approach. In this study, utility of user-subroutines is integrated into MSC SuperForm v.2004 and MSC Marc v.2003 FEA pac

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27

Söderberg, Anders. "Interface modeling - friction and wear." Doctoral thesis, KTH, Maskinkonstruktion (Avd.), 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-9861.

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The general trend toward increased use of computer models and simulations during product development calls for accurate and reliable product models. The function of many products relies on contact interfaces between interacting components. Simulating the behavior of such products requires accurate models of both components and interfaces. Depending on the purpose of the simulation, interface models of different degrees of detail are needed. In simulating very large systems with many interfaces, it might be computationally expensive to integrate detailed models of each individual interface. Con

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28

Colegrove, Paul Andrew. "Modelling of friction stir welding." Thesis, University of Cambridge, 2004. https://www.repository.cam.ac.uk/handle/1810/240576.

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This thesis investigates the modelling of friction stir welding (FSW). FSW is a relatively new welding process where a rotating non-consumable tool is used to join two materials through high temperature deformation. The aim of the thesis is the development of a numerical model to improve process understanding and to assist in the design of new tools. The early part of the thesis describes the process, defines the modelling problem and describes why a computational fluid dynamics package (FLUENT) was selected for the subsequent work. A systematic series of friction stir welding experiments in 7

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Bartels, Guido. "Mesoscopic Aspects of Solid Friction." Gerhard-Mercator-Universitaet Duisburg, 2006. http://www.ub.uni-duisburg.de/ETD-db/theses/available/duett-01272006-083621/.

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The phenomenon of friction is on the one hand useful, for example for walking, which would not be so easy without friction, and on the other hand disturbing, for example in wheel bearings, where it slows down desired motion. Therefore, the origin and effect of friction is under intense research. One main point in this work is the analytic investigation of the coupling between friction force and (torsion) friction torque of a sliding and spinning disk. The local friction force at a contact area element was chosen to be an algebraic function of the local relative velocity with an exponent α > 0.

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Garoff, Niklas. "The Friction between Paper Surfaces." Doctoral thesis, Stockholm, 2002. http://www.diva-portal.org/kth/theses/abstract.xsql?dbid=3415.

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31

Vairis, Achilles. "High frequency linear friction welding." Thesis, Online version, 1997. http://ethos.bl.uk/OrderDetails.do?did=1&uin=uk.bl.ethos.389136.

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de, Silveira Glynis. "Friction of paper and board." Thesis, University of Cambridge, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.606347.

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33

Koubek, Radek, and Karolina Dedicova. "Friction of wood on steel." Thesis, Linnéuniversitetet, Institutionen för byggteknik (BY), 2014. http://urn.kb.se/resolve?urn=urn:nbn:se:lnu:diva-35094.

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This thesis deals with the experimental description of friction between steel and wood materials, specifically laminated veneer lumber (LVL) and pine wood with two types of annual rings. It studies the influence of a number of different parameters on the coefficient of friction such as contact pressure, moisture content, fiber orientation in relation to the load direction, steel surface roughness, and horizontal load rate. First, the theoretical mechanical and physical properties as well as the coefficient of friction itself are described. This is followed by the description of the test setup

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34

Awawdeh, Mohammed Adel. "An investigation of orthodontic friction." Thesis, Queen's University Belfast, 2006. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.431404.

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35

Hwang, Kuo-Lun. "Friction in unsteady pipe flows." Thesis, University of Dundee, 1990. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.413174.

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36

Sehmbi, Jatinder Singh. "The dynamics of friction oscillators." Thesis, University College London (University of London), 2001. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.248042.

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37

Motamedi, Farshad. "Interfacial friction in fabric mechanics." Thesis, Imperial College London, 1989. http://hdl.handle.net/10044/1/47577.

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38

Liao, Kai Ph D. Massachusetts Institute of Technology. "Factors affecting piston ring friction." Thesis, Massachusetts Institute of Technology, 2013. http://hdl.handle.net/1721.1/82499.

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Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Aeronautics and Astronautics, 2013.<br>This thesis was scanned as part of an electronic thesis pilot project.<br>Cataloged from PDF version of thesis.<br>Includes bibliographical references (p. 153-156).<br>The piston ring pack friction is a major contributor to the internal combustion engine mechanical friction loss. The oil control ring decides the oil supply to the top two rings in addition to being the major friction contributor in the ring pack. This work concentrated on the oil control ring friction. A large range of ring l

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39

Ella, Samantha. "Rubber snow interface and friction." Thesis, University of Edinburgh, 2014. http://hdl.handle.net/1842/17941.

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Tyres are used in everyday life for a variety of practical and recreational tasks. Frictional behaviour of tyres on any surface is important for vehicle safety and control; this behaviour becomes more important when that surface is snow. The interaction of rubber and a snow surface is complex and a deeper understanding of both is needed in order to help develop better tyres. Outdoor full scale tyre test results were compared to results from indoor laboratory tests using a linear tribometer and a surface of compacted artificial snow; these were in excellent correlation allowing a systematic and

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40

Pereira, Diogo Jorge O. A. "Friction surfacing of aluminium alloys." Master's thesis, Faculdade de Ciências e Tecnologia, 2012. http://hdl.handle.net/10362/8758.

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Dissertação para a obtenção do grau de Mestre em Engenharia Mecânica<br>Friction surfacing is a solid state joining process that has attracted much interest in the past decades. This technology allows joining dissimilar metallic materials while avoiding the brittle intermetallic formations, involving temperatures bellow melting point and producing like forged metal structures. Much research using different steels has been made but the same does not happen with aluminium alloys, specially using different aluminium alloys. Friction surface coatings using consumable rods of AA6082-T6 were produ

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41

Wu-Bavouzet, Fangnien. "Friction sur surfaces à plots." Paris 6, 2008. http://www.theses.fr/2008PA066383.

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L'objet de cette thèse est l'adhésion et la friction de lentilles millimétriques d'élastomères sur un substrat décoré de plots micrométriques de hauteur variable. A cette fin, nous avons utilisé un AFM géant permettante mesurer les forces normales et tangentielles appliquées à la lentille et d'observer le contact. Il permet d'explorer des vitesses de glissement de l'ordre de 100 µm/s, et des forces de l'ordre de 10-3 N. Nous avons observé deux types de contact selon la hauteur h des plots : intime (h<hc) et posé (h>hc). Les régimes de glissement observés dépendent de la dureté de l'élastomère

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Ляшенко, Яків Олександрович, Яков Александрович Ляшенко, and Yakiv Oleksandrovych Liashenko. "Friction force for boundary lubrication." Thesis, Видавництво СумДУ, 2011. http://essuir.sumdu.edu.ua/handle/123456789/20362.

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Opanasyuk, S. "Nanotribology: microscopic mechanisms of friction." Thesis, Вид-во СумДУ, 2007. http://essuir.sumdu.edu.ua/handle/123456789/17441.

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Nanotribology is the science of surfaces in relative motion. It is of great theoretical interest and huge practical significance. When you are citing the document, use the following link http://essuir.sumdu.edu.ua/handle/123456789/17441

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Li, Yang. "Single Molecule Spintronics and Friction." Ohio University / OhioLINK, 2018. http://rave.ohiolink.edu/etdc/view?acc_num=ohiou151561792063398.

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45

Laine, Antoine. "Sliding Friction at the nanoscale." Thesis, Université de Paris (2019-....), 2020. http://www.theses.fr/2020UNIP7076.

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Dans ce manuscrit, nous utilisons des méthodes dérivées de la microscopie à force atomique afin de mesurer, à l'échelle nanométrique, la réponse mécanique de différents systèmes. L'accent est porté sur la mise en lumière de la réponse frictionnelle et des mécanismes de dissipation à l'échelle du contact unique, où matières molle et condensée se confondent.Nous présentons premièrement le développement d'un nouvel outil expérimental permettant des mesures de nano-rhéologie et de nano-tribologie en environnement contrôlé. L'étude des propriétés mécaniques de liquides ioniques nano-confinés, avec

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46

Fina, Ernesto. "The friction of racing tyres." Thesis, University of Surrey, 2016. http://epubs.surrey.ac.uk/812823/.

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This research investigates the frictional behaviour of racing tyres and compares it to the behaviour of standard road tyres. The analysis is carried out by simulating a racing tyre and a standard tyre rolling on a common track surface. A novel physical tyre model has been developed for this purpose. The model allows a detailed description of the tyre footprint mechanics, the tread compound and road surface physical characteristics. The design and development of the physical tyre model is the result of an in depth literature review, which investigates and critically discusses the main modern th

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47

Carnasciali, Maria-Isabel. "Kinetic friction of nonwetting drops." Diss., Atlanta, Ga. : Georgia Institute of Technology, 2008. http://hdl.handle.net/1853/22650.

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Thesis (Ph. D.)--Mechanical Engineering, Georgia Institute of Technology, 2008.<br>Committee Chair: Neitzel, G. Paul; Committee Member: Allen, Mark G.; Committee Member: Degertekin, F. Levent; Committee Member: Schatz, Michael; Committee Member: Smith, Marc K.

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Söderberg, Anders. "Interface modeling : friction and wear /." Stockholm : Maskinkonstruktion, Kungliga Tekniska högskolan, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-9861.

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49

Guan, Jian. "Droplets on low friction surfaces." Thesis, Northumbria University, 2017. http://nrl.northumbria.ac.uk/35092/.

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Droplet mobility on surfaces is often hampered by the pinning of the droplet’s contact line. External forces would be needed if motion is to continue. The development of Slippery Liquid-Infused Porous Surfaces (SLIPS) or Lubricant-Impregnated Surfaces (LIS) has since enabled the studies of droplets in low friction situations with virtually no contact angle hysteresis. This thesis presents three separate studies of droplet mobility in the absence of contact line pinning, made possible by the use of SLIPS/LIS. Firstly, the first study of evaporation of sessile droplet under true constant contact

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Andreasson, Erik. "Validation of Friction Estimating System." Thesis, Luleå tekniska universitet, Institutionen för teknikvetenskap och matematik, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:ltu:diva-65393.

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Gli stili APA, Harvard, Vancouver, ISO e altri

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