Relevant bibliographies by topics / Coefficient of static friction

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Academic literature on the topic 'Coefficient of static friction'

Author: Grafiati
Published: 4 June 2021
Last updated: 15 February 2022

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Journal articles on the topic "Coefficient of static friction"

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Rusinek, R., and M. Molenda. "Static and kinetic friction of rapeseed." Research in Agricultural Engineering 53, No. 1 (January 7, 2008): 14–19. http://dx.doi.org/10.17221/2129-rae.

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he present paper examines the static and kinetic coefficient of friction of rapeseed. The project utilized two methods of determination of coefficient of friction of rapeseed: according Eurocode 1 (kinetic) in direct shear test and (static) in model silo. Samples of rapeseed in a range of moisture content from 6 to 15% w.b. were used and the tests were performed for galvanized steel, stainless steel and concrete B 30. Coefficient of friction for both steel types approached stable value for all levels of moisture content w.b. in a range from 0.11 to 0.18, for concrete B 30 it was found in a range from 0.25 to 0.43. The coefficient of static friction found in model silo decreased with an increase in vertical pressure from 0.3 to 0.2 for first loading, while in subsequent loading cycles decreased from 0.2 to 0.1.
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Pluta, Zdzisław, and Tadeusz Hryniewicz. "Adequate Force Characteristics of a Friction System." International Letters of Chemistry, Physics and Astronomy 13 (September 2013): 20–36. http://dx.doi.org/10.18052/www.scipress.com/ilcpa.13.20.

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In the paper, at first some remarks concerning friction are presented by the definition of the friction itself, as well as its essential force characteristics. An adequate definition of friction is introduced, and moreover a correct its characteristics. Next the statics, dynamics, and kinematics of the friction system is given, forming the force characteristics of this system for each of the mechanical behaviours, taking into account real inertia forces of the body under friction. Three types of coefficients of sliding friction have been separated, namely: coefficient of static friction, dynamic friction, and kinematic friction. Then the comparative analysis of existent and new knowledge on the force characteristics of friction process has been presented. The consideration on how to determine the coefficient of static friction has also been carried out. Reflections on the possibilities to form further force characteristics of the friction process are presented to develop this work with some final remarks directing the attention on the conditions of development of science on friction.
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Todorović, P. M., M. Blagojević, D. Vukelić, I. Mačužić, M. Jeremić, A. Simić, and B. Jeremić. "Static coefficient of rolling friction under heating." Journal of Friction and Wear 34, no. 6 (November 2013): 450–53. http://dx.doi.org/10.3103/s1068366613060123.

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Qiu, Ming Ming, Han Zhao, and Fa Ming Sha. "The Simulation Research of Dual Clutch Transmission's Starting Process Based on Dynamic Friction Coefficient." Applied Mechanics and Materials 401-403 (September 2013): 320–25. http://dx.doi.org/10.4028/www.scientific.net/amm.401-403.320.

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Introduce the dynamic friction coefficient of clutch friction plate. Establish Mathematical model of starting process, carried out vibration analysis for frictional sliding process systematically, validated the analysis using Matlab/simulink software. Meanwhile, compared with the starting process by static friction coefficient. The results show that using dynamic friction coefficient to analyse starting process conforms to the actual working condition.
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Chang, W. R., I. Etsion, and D. B. Bogy. "Static Friction Coefficient Model for Metallic Rough Surfaces." Journal of Tribology 110, no. 1 (January 1, 1988): 57–63. http://dx.doi.org/10.1115/1.3261575.

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The friction force required to shear interface bonds of contacting metallic rough surfaces is calculated, taking into account the prestress condition of contacting asperities. The surfaces are modeled by a collection of spherical asperities with Gaussian height distribution. Previous analyses for adhesion force and contact load of such surfaces are used to obtain the static friction coefficient. It is shown that this coefficient is affected by material properties and surface topography, and that it actually depends on the external loading contrary to the classical law of friction.
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Li, Xiao Guang, and Ping Zhao. "Study on Tribological Performances of Friction Plate on MW Wind Power." Applied Mechanics and Materials 217-219 (November 2012): 314–17. http://dx.doi.org/10.4028/www.scientific.net/amm.217-219.314.

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The effects of contact pressure and sliding velocity and different environment conditions on the frictional coefficient of friction plate on MW wind power were studied by fatigue testing machine. The results show that the coefficient of static friction and difference between static and dynamic reduced with the increase of sliding speed, and reduced first and then increased and then reduced with the increase of contact pressure, and the change of dynamic friction coefficient was relatively flat with velocity and pressure under dry friction. The impact of water on the triological performance was the large, followed by oil when considering environment factors. Water and pressure and oil were the main influencing factors in considering all factors comprehensively.
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Wang, S., and K. Komvopoulos. "Static Friction and Initiation of Slip at Magnetic Head-Disk Interfaces." Journal of Tribology 122, no. 1 (June 8, 1999): 246–56. http://dx.doi.org/10.1115/1.555349.

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The apparent friction force and electric contact resistance at the magnetic head-disk interface were measured simultaneously for textured and untextured disks lubricated with perfluoropolyether films of different thicknesses. The initial stick time, representing the time between the application of a driving torque and the initiation of interfacial slip, was determined based on the initial rise of the apparent friction force and the abrupt increase of the electric contact resistance. Relatively thin lubricant films yielded very short initial stick times and low static friction coefficients. However, for a film thickness comparable to the equivalent surface roughness, relatively long initial stick times and high static friction coefficients were observed. The peak value of the apparent friction coefficient was low for thin lubricant films and increased gradually with the film thickness. The variations of the initial stick time, static friction coefficient, and peak friction coefficient with the lubricant film thickness and surface roughness are interpreted in the context of a new physical model of the lubricated interface. The model accounts for the lubricant coverage, effective shear area, saturation of interfacial cavities, limited meniscus effects, and the increase of the critical shear stress of thin liquid films due to the solid-like behavior exhibited at a state of increased molecular ordering. [S0742-4787(00)03101-5]
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Stoyanova, Raya, Sasho Aleksandrov, and Umme Kapanak. "Study of the influence of compressive force on the coefficients of friction for wool-containing fabrics." E3S Web of Conferences 207 (2020): 03003. http://dx.doi.org/10.1051/e3sconf/202020703003.

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Making use of appliance MXD-02, Labthink, China, coefficient of friction at rest with sliding tendency (static coefficient of friction) and coefficient of friction at sliding (dynamic coefficient of friction) for fabrics made of 100% wool as well as woolen fabrics with admixtures of polyamide and polyester were determined. The influence of the magnitude of normal pressure on the coefficients of friction was studied. Experiments taking into consideration the following different directions of relative fabric movement were performed: warp by warp threads, and warp by weft. An analysis of the obtained results was made.
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Changfu, Sui, and Sheng Xuanyu. "Fractal Transition Model in Predicting Static Friction Coefficient." Multidiscipline Modeling in Materials and Structures 5, no. 4 (October 1, 2009): 345–48. http://dx.doi.org/10.1163/157361109789807972.

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Yamada, Yoji, Nuio Tsuchida, Koji Imai, and Hiroaki Kozai. "Static Friction Coefficient Sensor for Controlling Grasping Force." IEEJ Transactions on Electronics, Information and Systems 112, no. 12 (1992): 743–48. http://dx.doi.org/10.1541/ieejeiss1987.112.12_743.

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Dissertations / Theses on the topic "Coefficient of static friction"

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Oliver, William B. "An experimental investigation of the static coefficient of friction for sheetpile interlocks." Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/104522.

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Lång, Marcus. "Static Friction in Slip Critical Bolt Joints : Coefficient of Friction in Steel, Aluminium and ED Coated Steel." Thesis, Karlstads universitet, 2017. http://urn.kb.se/resolve?urn=urn:nbn:se:kau:diva-55223.

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This project was performed together with ÅF Industry AB in Trollhättan, Sweden. ÅF’s expertise in Trollhättan is oriented towards the automotive industry. It was conducted within the section of CAE and safety where they, for instance, dimension bolt joints in the cars. Bolt joints play an important role in the automotive industry. Slip critical bolt joints are used widely throughout the vehicles. With lack of good test data, the bolt joints need to be dimensioned conservatively. This may lead to that bolt joints are over-dimensioned, adding more mass to the car. On the contrary, the availability of reliable test data enables designers to optimize joint dimensions to achieve a safe design with minimized mass. A mechanical testing configuration has been designed as well as a testing procedure for a test to determine the static friction value between mating surfaces in bolt joints. The testing configuration has been used to perform tests to find the static friction coefficient in different materials. The study contains varied combinations of steel, aluminium and ED-Coated steel. The study resulted in tables with levels of probability. The developed test configuration is robust and relatively simple to use and is recommended for further use. For improved statistical significance, it was noted that more samples should be used than was used in this study. The aluminium has a smoother surface finish and that could be the reason why its coefficient of friction is lower than steel. It is therefore considered important to also include surface roughness when presenting coefficient of friction results.
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Kinsella, Mary E. "Ejection forces and static friction coefficients for rapid tooled injection mold inserts." Connect to this title online, 2004. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=osu1092660338.

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Thesis (Ph. D.)--Ohio State University, 2004.
Title from first page of PDF file. Document formatted into pages; contains xvi, 206 p.; also includes graphics (some col.). Includes bibliographical references (p. 167-173). Available online via OhioLINK's ETD Center
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Längkvist, Martin. "Online Identification of Friction Coefficients in an Industrial Robot." Thesis, Linköping University, Department of Electrical Engineering, 2009. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-19269.

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All mechanical systems with moving parts are affected by friction, including industrial robots. Being able to design an accurate friction model would further increase the performance of todays robots. Friction is a complex dynamic phenomena that is constantly changing depending on the state and environment of the robot. It is therefore beneficial to update the parameters of the friction model online. An estimate of the friction will be made using the feedback control signal with the help of a feedforward control scheme in a two axis simulation setup. The friction estimate is then used for an offline identification of three friction model parameters in a static Lugre friction model. Improvements on the identification will be done by introducing some shut-off rules that will improve the estimate. The normalized least mean square method (NLMS) will then be used to update the parameters online. A simulation of friction compensation with a fixed friction model, and with an adaptive friction model will be studied. The method will also be simulated using experimental data taken from a real industrial robot.

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Hutama, Chapin. "Effect of Inclusion of Nanofibers on Rolling Resistance and Friction of Silicone Rubber." University of Akron / OhioLINK, 2019. http://rave.ohiolink.edu/etdc/view?acc_num=akron1556118372072796.

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Fasol, Christian. "Hydrodynamique et transfert de chaleur dans un mélangeur statique Sulzer SMX avec des fluides rhéologiquement complexes." Vandoeuvre-les-Nancy, INPL, 1995. http://www.theses.fr/1995INPL031N.

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Les mélangeurs statiques sont, grâce à leurs multiples avantages, de plus en plus utilisés dans l'industrie, en particulier lorsque les procédés font intervenir des fluides rhéologiquement complexes. Cette utilisation est cependant essentiellement basée sur l'empirisme et le savoir-faire. Nous avons étudié l'hydrodynamique, via la distribution des temps de séjour (DTS) et la perte de charge, et le transfert de chaleur, éventuellement couplés dans un type de mélangeur particulièrement adapté aux fluides visqueux: le mélangeur statique Sulzer SMX. Nous proposons un modèle de DTS basé sur l'association en parallèle pour chaque élément de mélangeur statique d'un écoulement piston et d'un réacteur parfaitement agité ; les deux paramètres à ajuster de ce modèle sont des fonctions d'un nombre de Reynolds généralisé qui tient compte de la rhéologie des fluides qui circulent dans le mélangeur. Nous proposons une corrélation pour le facteur de frottement en fonction de ce même nombre de Reynolds généralisé ; cette corrélation est valable qu'il y ait ou non couplage avec le transfert de chaleur. Le transfert de chaleur a été étudié de deux façons. D’une part par une approche globale et d'autre part par une approche prenant en compte l'hydrodynamique dans le mélangeur statique (connaissance de la DTS). Les corrélations obtenues concernant le coefficient de transfert de chaleur sont tout à fait comparables. Ce travail a été complété par deux études préliminaires: l'une a montré qualitativement l'efficacité du mélangeur à disperser du gaz dans des milieux rhéologiquement complexes ; l'autre a mis en évidence le caractère chaotique du mélange dans ce type de mélangeur
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Griffiths, Peter Robert. "Static and Dynamic Components of Droplet Friction." Scholar Commons, 2013. http://scholarcommons.usf.edu/etd/4897.

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As digital microfluidics has continued to mature since its advent in the early 1980's, an increase in new and novel applications of this technology have been developed. However, even as this technology has become more common place, a consensus on the physics and force models of the motion of the contact line between the fluid, substrate, and ambient has not been reached. This uncertainty along with the dependence of the droplet geometry on the force to cause its motion has directed much of the research at specific geometries and droplet actuation methods. The goal of this thesis is to help characterize the components of the friction force which opposes droplet motion as a one dimensional system model based upon simple system parameters independent from the actuation method. To this end, the force opposing the motion of a droplet under a thin rectangular glass cover slip was measured for varying cover slip dimensions (widths, length), gap height between the cover slip and substrate, and bulk droplet velocity. The stiffness of the droplet before droplet motion began, the force at which the motion initiated, and the steady-state force opposing the droplet motion were measured. The data was then correlated to hypothesized equations and compared to simple models accounting for the forces due to the contact angle hysteresis, contact line friction, and viscous losses. It was found that the stiffness, breakaway force, and steady-state force of the droplet could be correlated to with an error standard deviation of 8 %, 14%, and 10 % respectively. Much of the error was due to an unexpected height dependence for the breakaway and steady-state forces and testing error associated with the velocity. The models for the stiffness and breakaway force over predicted the results by 36% and 16% respectively. During testing, viii stability issues with the cover slip were observed and simple dye testing was conducted to visualize the droplet flow field.
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Grzeskiewicz, Ronald. "Effect of hydrogen on the coefficient of friction of iron." Thesis, This resource online, 1988. http://scholar.lib.vt.edu/theses/available/etd-04122010-083727/.

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Dorton, David W. "Experimental evaluation of effective friction coefficient for liquid ring seals." Thesis, This resource online, 1991. http://scholar.lib.vt.edu/theses/available/etd-08042009-040326/.

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Peterson, Eric W. "Tire-Road Friction Coefficient Estimation Using a Multi-scale, Physics-based Model." Thesis, Virginia Tech, 2014. http://hdl.handle.net/10919/51148.

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The interaction between a tire and road surface is of critical importance as the motion of a car in both transient and steady-state maneuvers is predicated on the friction forces generated at the tire-road interface. A general method for predicting friction coefficients for an arbitrary asphalt pavement surface would be an invaluable engineering tool for designing many vehicle safety and performance features, tire design, and improving asphalt-aggregate mixtures used for pavement surfaces by manipulating texture. General, physics-based methods for predicting friction are incredibly difficult, if not impossible to realize—However, for the specific case of rubber sliding across a rough surface, the primary physical mechanisms responsible for friction, notably rubber hysteresis, can be modeled. The objective of the subsequent research is to investigate one such physics model, referred to as Persson Theory, and implement the constitutive equations into a MatLab® code to be solved numerically. The model uses high-resolution surface measurements, along with some of the physical properties of rubber as inputs and outputs the kinetic friction coefficient. The Persson model was successfully implemented into MatLab® and high resolution measurements (from optical microscopy and imaging software) were obtained for a variety of surfaces. Friction coefficients were calculated for each surface and compared with measured friction values obtained from British Pendulum testing. The accuracy and feasibility of the Persson model are discussed and results are compared with a simpler, semi-empirical indenter model. A brief discussion of the merits and drawbacks of the Persson model are offered along with recommendations for future research based on the information acquired from the present study.
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Books on the topic "Coefficient of static friction"

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Forland, Kathryn A. Kinetic friction coefficient of ice. [Hanover, N.H.]: US Army Corps of Engineers, Cold Regions Research & Engineering Laboratory, 1985.

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Healy, Alan Gerard. An investigation of methods of measuring the coefficient of friction of roadstone. [London]: Queen Mary and Westfield College, 1997.

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Nagel, F. A method for the approximate calculation of the skin friction coefficient of horizontal wavy plates. Rhode Saint Genese, Belgium: von Karman Institute for Fluid Dynamics, 1987.

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Miyoshi, Kazuhisa. Durability evaluation of selected solid lubricating films. [Cleveland, Ohio]: National Aeronautics and Space Administration, Glenn Research Center, 2001.

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Zaharioudakis, Nikolaos I. An investigation of performance of aggregate mixtures by measuring their skid-resistance and coefficient of friction. [London]: Queen Mary and Westfield College, 1998.

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Miyoshi, Kazuhisa. Surface chemistry, friction, and wear properties of untreated and laser-annealed surfaces of pulsed-laser-deposited WS₂ coatings. [Washington, D.C: National Aeronautics and Space Administration, 1996.

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Miyoshi, Kazuhisa. Surface chemistry, friction, and wear properties of untreated and laser-annealed surfaces of pulsed-laser-deposited WS₂ coatings. [Washington, D.C: National Aeronautics and Space Administration, 1996.

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Miyoshi, Kazuhisa. Friction and wear of ion-beam-deposited diamondlike carbon on chemical-vapor-deposited, fine-grain diamond. [Washington, D.C: National Aeronautics and Space Administration, 1996.

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Miyoshi, Kazuhisa. Friction and wear of ion-beam-deposited diamondlike carbon on chemical-vapor-deposited, fine-grain diamond. [Washington, D.C: National Aeronautics and Space Administration, 1996.

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Miyoshi, Kazuhisa. Friction and wear of ion-beam-deposited diamondlike carbon on chemical-vapor-deposited, fine-grain diamond. [Washington, D.C: National Aeronautics and Space Administration, 1996.

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Book chapters on the topic "Coefficient of static friction"

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Gooch, Jan W. "Coefficient of Friction, Static." In Encyclopedic Dictionary of Polymers, 151. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_2535.

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Gooch, Jan W. "Static Coefficient of Friction." In Encyclopedic Dictionary of Polymers, 697. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_11168.

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Tamura, Hitoshi, and Yasushi Kambayashi. "Estimation of Coefficient of Static Friction of Surface by Analyzing Photo Images." In Intelligent Decision Technologies 2016, 15–26. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-39627-9_2.

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Sacher, Alex. "Is the 0.5 Static Coefficient of Friction Value a Bench Mark or a Watershed?" In Materials & Equipment/Whitewares: Ceramic Engineering and Science Proceedings, Volume 13, Issue 1/2, 29–45. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2008. http://dx.doi.org/10.1002/9780470313916.ch4.

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Srinivasan, U., R. T. Howe, and R. Maboudian. "Lubrication of Polysilicon Micromechanisms with Alkylsiloxane Self-Assembled Monolayers: Coefficient of Static Friction Measurements." In Tribology Issues and Opportunities in MEMS, 597–606. Dordrecht: Springer Netherlands, 1998. http://dx.doi.org/10.1007/978-94-011-5050-7_45.

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Scharff, M., M. Darnieder, J. Steigenberger, and C. Behn. "Towards the Development of Tactile Sensors for Determination of Static Friction Coefficient to Surfaces." In Mechanisms and Machine Science, 39–48. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-45387-3_4.

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Eliseev, Alexander A., Tatiana A. Kalashnikova, Andrey V. Filippov, and Evgeny A. Kolubaev. "Material Transfer by Friction Stir Processing." In Springer Tracts in Mechanical Engineering, 169–88. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-60124-9_8.

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AbstractMechanical surface hardening processes have long been of interest to science and technology. Today, surface modification technologies have reached a new level. One of them is friction stir processing that refines the grain structure of the material to a submicrocrystalline state. Previously, the severe plastic deformation occurring during processing was mainly described from the standpoint of temperature and deformation, because the process is primarily thermomechanical. Modeling of friction stir welding and processing predicted well the heat generation in a quasi-liquid medium. However, the friction stir process takes place in the solid phase, and therefore the mass transfer issues remained unresolved. The present work develops the concept of adhesive-cohesive mass transfer during which the rotating tool entrains the material due to adhesion, builds up a transfer layer due to cohesion, and then leaves it behind. Thus, the transfer layer thickness is a clear criterion for the mass transfer effectiveness. Here we investigate the effect of the load on the transfer layer and analyze it from the viewpoint of the friction coefficient and heat generation. It is shown that the transfer layer thickness increases with increasing load, reaches a maximum, and then decreases. In so doing, the average moment on the tool and the temperature constantly grow, while the friction coefficient decreases. This means that the mass transfer cannot be fully described in terms of temperature and strain. The given load dependence of the transfer layer thickness is explained by an increase in the cohesion forces with increasing load, and then by a decrease in cohesion due to material overheating. The maximum transfer layer thickness is equal to the feed to rotation rate ratio and is observed at the axial load that causes a stress close to the yield point of the material. Additional plasticization of the material resulting from the acoustoplastic effect induced by ultrasonic treatment slightly reduces the transfer layer thickness, but has almost no effect on the moment, friction coefficient, and temperature. The surface roughness of the processed material is found to have a similar load dependence.
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Chen, Wei, Han Wen, Heba Khamis, and Stephen J. Redmond. "An Eight-Legged Tactile Sensor to Estimate Coefficient of Static Friction: Improvements in Design and Evaluation." In Haptics: Perception, Devices, Control, and Applications, 493–502. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-42321-0_46.

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Kruse, Sebastian, Bernhard Stingl, Jakob Hieke, Antonio Papangelo, Merten Tiedemann, Norbert Hoffmann, and Michele Ciavarella. "The Influence of Loading Conditions on the Static Coefficient of Friction: A Study on Brake Creep Groan." In Topics in Modal Analysis I, Volume 7, 149–60. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-04753-9_15.

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Gooch, Jan W. "Friction Coefficient." In Encyclopedic Dictionary of Polymers, 327–28. New York, NY: Springer New York, 2011. http://dx.doi.org/10.1007/978-1-4419-6247-8_5316.

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Conference papers on the topic "Coefficient of static friction"

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Huang, Jack Youqin. "Coefficients of Friction: Static Versus Dynamic." In 2020 Joint Rail Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/jrc2020-8025.

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Abstract This paper deals with the problem of static and dynamic (or kinetic) friction, namely the coefficients of friction for the two states. The coefficient of static friction is well known, and its theory and practice are commonly accepted by the academia and the industry. The coefficient of kinetic friction, however, has not fully been understood. The popular theory for the kinetic friction is that the coefficient of dynamic friction is smaller than the coefficient of static friction, by comparison of the forces applied in the two states. After studying the characteristics of the coefficient of friction, it is found that the comparison is not appropriate, because the inertial force was excluded. The new discovery in the paper is that coefficients of static friction and dynamic friction are identical. Wheel “locked” in wheel braking is further used to prove the conclusion. The key to cause confusions between the two coefficients of friction is the inertial force. In the measurement of the coefficient of static friction, the inertial force is initiated as soon as the testing object starts to move. Therefore, there are two forces acting against the movement of the object, the frictional force and the inertial force. But in the measurement of the coefficient of kinetic friction, no inertial force is involved because velocity must be kept constant.
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Haroon Rasheed, Abdullah, Victor Romero, Florence Bertails-Descoubes, Stefanie Wuhrer, Jean-Sebastien Franco, and Arnaud Lazarus. "Learning to Measure the Static Friction Coefficient in Cloth Contact." In 2020 IEEE/CVF Conference on Computer Vision and Pattern Recognition (CVPR). IEEE, 2020. http://dx.doi.org/10.1109/cvpr42600.2020.00993.

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Chen, Wei, Sura Rodpongpun, William Luo, Nathan Isaacson, Lauren Kark, Heba Khamis, and Stephen J. Redmond. "An eight-legged tactile sensor to estimate coefficient of static friction." In 2015 37th Annual International Conference of the IEEE Engineering in Medicine and Biology Society (EMBC). IEEE, 2015. http://dx.doi.org/10.1109/embc.2015.7319372.

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Jang, Siyoul. "Frictional Torque Transfer Behaviors of Friction Pads in Wet Clutch Engagement." In ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-53032.

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For stable frictional torque transfer, wet clutch pads have the functional requirements of a high traction and a low wear rate with positive μ-V frictional characteristics. However, because of the intrinsic negative μ-V frictional characteristics of a friction material that has a static friction coefficient greater than its kinetic friction coefficient, the frictional torque transfer has unstable vibrations during the clutch-pad engagement. To reduce the vibration mode during the engagement of wet clutch pads, the kinetic friction coefficient should be made greater than the static friction coefficient through modifications in the design parameters as well as in the characteristics of the friction materials. To obtain positive μ-V frictional characteristics, it is important to manipulate the static-friction coefficient, which largely develops in the boundary lubrication stage during the clutch-pad engagement. The formation of the boundary film is described by slip boundary conditions and hydrodynamic lubrication films. It also includes the elastic deformation of the wet pad material due to the contact pressure. The wet clutch pad material is made of a porous structure through which the lubricant can easily spread when the applied load and sliding speed are imposed. The lubrication and the direct contact of the surfaces are simultaneously considered for a frictional torque transfer that lasts for less than one second, depending on the working conditions. In this study, some of the computational results with a measured μ-V friction coefficient covering both the static and kinetic friction during the wet-clutch engagement are obtained for the lubrication and the direct-contact pressures.
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Ding, Lingyun, Zhongliang Gong, and Ping Huang. "Study on the Atomic-Scale Mechanism of Static Friction." In STLE/ASME 2008 International Joint Tribology Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/ijtc2008-71127.

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A new model named as the coupled-oscillator model, is proposed to study the atomic-scale static friction. The Maugis-Dugdal model is used to approximately substitute the Lennard-Jones potential of the interfacial friction in new model. Then, the formulas for static friction force and coefficient calculation are deduced. A comparison between the theoretical result and the experimental value obtained by an atomic force microscope is presented to show the model and the formulas practically feasible.
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Yang, J., and K. Komvopoulos. "A Mechanics Approach to Static Friction of Elastic-Plastic Fractal Surfaces." In ASME/STLE 2004 International Joint Tribology Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/trib2004-64271.

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A contact mechanics theory of static friction is presented for isotropic rough surfaces exhibiting fractal behavior. The analysis is based on a piece-wise power-law size distribution and a normal slope distribution of the asperity contacts and elastic-fully plastic deformation models. Numerical integration yields solutions for the normal and friction forces in terms of fractal parameters, elastic-plastic material properties, and interfacial shear strength. The variation of the static coefficient of friction with normal load is related to the effect of the surface topography on the dominant deformation mode at the asperity contacts. Plastic deformation of the smaller asperity contacts dominates at low loads and elastic deformation of the larger asperity contacts at high loads. The critical load signifying the transition from predominantly plastic to elastic deformation depends on the fractal parameters and material properties. In the low-load range, the static coefficient of friction decreases with the increase of the load, while in the high-load range it increases relatively faster with the load. Numerical results for copper fractal surfaces illustrate the effects of normal load, surface topography, and interfacial shear strength on the static coefficient of friction.
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Borsotto, Bastien, Emmanuel Godoy, Dominique Beauvois, and Emmanuel Devaud. "An identification method for static and dynamic friction coefficients." In 2007 International Conference on Control, Automation and Systems. IEEE, 2007. http://dx.doi.org/10.1109/iccas.2007.4407037.

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Ni, Ting, and Xi Shi. "Effects of Angular Motion on Planar Rough Surfaces Contact From Static to Sliding." In STLE/ASME 2010 International Joint Tribology Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ijtc2010-41034.

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Due to the friction moment, there is an angular displacement when two flat rough surfaces come to sliding contact or quasi sliding contact. A 2-DOF inclined rough surface contact model is presented in this work, and the effects of the angular displacement on the friction coefficient, interfacial forces and moments are investigated. The numerical simulations show that both interfacial forces and moments increase with the increasing inclined angle, while the friction coefficient decreases instead. In addition, for a given sliding mass block system, the effects of the friction coefficient and the base sliding speed on the stability of the sliding contact are also discussed. The simulations indicate that a larger friction coefficient and a higher base sliding speed tend to turn over the mass block during the sliding.
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Piatkowski, Tomasz, Miroslaw Wolski, and Przemyslaw Osowski. "Identification of Nonlinear Friction Properties in the Conditions of Self-Excited Vibrations." In ASME 2017 Dynamic Systems and Control Conference. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/dscc2017-5409.

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The paper presents method of the friction coefficient characteristics determination for kinematic pairs in the self-excited vibration conditions occurring in the Froude pendulum. Friction coefficients were calculated by measuring the vibration amplitude of the pendulum. Measurement of this amplitude for kinetic friction coefficient is carried out in the conditions of sliding friction and a static one — when the conditions of stickslip phenomena exist. The proposed method was verified using the LuGre friction model.
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Miller, Scott, Lee Arnold, and Grant Kruger. "Experimental Investigation of Coefficient of Friction During the Friction Stir Processing of Aluminum." In ASME 2010 International Manufacturing Science and Engineering Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/msec2010-34106.

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There is a lack in understanding of the frictional contact condition during friction stir processes. High temperature, force and work material adhesion to and from the tool make the coefficient of friction difficult to measure. In this study, an experiment was set up to simultaneously measure the temperature and normal and frictional forces between a rotating tool and a stationary workpiece at steady state conditions. The coefficient of friction was measured for increasing temperature. A simple model was created to convert the thermocouple temperature measurement to the temperature at the point of contact between the tool and workpiece. It was found that the coefficient of friction had a decreasing trend as temperature approached the solidus temperature of the work material. The results and analysis of the experiments are presented.
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Reports on the topic "Coefficient of static friction"

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Wei, Fulu, Ce Wang, Xiangxi Tian, Shuo Li, and Jie Shan. Investigation of Durability and Performance of High Friction Surface Treatment. Purdue University, 2021. http://dx.doi.org/10.5703/1288284317281.

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The Indiana Department of Transportation (INDOT) completed a total of 25 high friction surface treatment (HFST) projects across the state in 2018. This research study attempted to investigate the durability and performance of HFST in terms of its HFST-pavement system integrity and surface friction performance. Laboratory tests were conducted to determine the physical and mechanical properties of epoxy-bauxite mortar. Field inspections were carried out to identify site conditions and common early HFST distresses. Cyclic loading test and finite element method (FEM) analysis were performed to evaluate the bonding strength between HFST and existing pavement, in particular chip seal with different pretreatments such as vacuum sweeping, shotblasting, and scarification milling. Both surface friction and texture tests were undertaken periodically (generally once every 6 months) to evaluate the surface friction performance of HFST. Crash records over a 5-year period, i.e., 3 years before installation and 2 years after installation, were examined to determine the safety performance of HFST, crash modification factor (CMF) in particular. It was found that HFST epoxy-bauxite mortar has a coefficient of thermal expansion (CTE) significantly higher than those of hot mix asphalt (HMA) mixtures and Portland cement concrete (PCC), and good cracking resistance. The most common early HFST distresses in Indiana are reflective cracking, surface wrinkling, aggregate loss, and delamination. Vacuum sweeping is the optimal method for pretreating existing pavements, chip seal in particular. Chip seal in good condition is structurally capable of providing a sound base for HFST. On two-lane highway curves, HFST is capable of reducing the total vehicle crash by 30%, injury crash by 50%, and wet weather crash by 44%, and providing a CMF of 0.584 in Indiana. Great variability may arise in the results of friction tests on horizontal curves by the use of locked wheel skid tester (LWST) due both to the nature of vehicle dynamics and to the operation of test vehicle. Texture testing, however, is capable of providing continuous texture measurements that can be used to calculate a texture height parameter, i.e., mean profile depth (MPD), not only for evaluating friction performance but also implementing quality control (QC) and quality assurance (QA) plans for HFST.
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