Thematische Bibliographien / Friction modification

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Auswahl der wissenschaftlichen Literatur zum Thema „Friction modification“

Autor: Grafiati

Veröffentlicht am 28. Juni 2021

Zuletzt aktualisiert am 13. Februar 2022

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Zeitschriftenartikel zum Thema "Friction modification"

Chen, Shi, und Zhinan Zhang. „Modification of friction for straightforward implementation of friction law“. Multibody System Dynamics 48, Nr. 2 (10.09.2019): 239–57. http://dx.doi.org/10.1007/s11044-019-09694-0.

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Sadowski, Piotr, und Emil Czajka. „Modification of tribological tester t-01m allowing testing in conditions of lubrication“. MATEC Web of Conferences 252 (2019): 08004. http://dx.doi.org/10.1051/matecconf/201925208004.

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Researchers often want to develop their experiments in terms of wide range of testing conditions and results possible to acquire. One way to achieve this is to adapt existing testing equipment to new requirements. This paper proposes a method for extending the capabilities of the T-01M tester with a pressure lubrication system of a pin on disc contact, its construction and adjustments. Tribological tests carried out with the presence of a lubricant showed the correct functioning of the modified tester. We obtained several variables for the selected friction pair and friction parameters in the lubricated joint: friction force, friction coefficient, mass wear, friction work, wear intensity and specific wear. Verification tests confirmed suitability of the tester modification, adapting it to friction and wear tests in a lubricated contact. The expanded stand can be used (in the future) for tribological tests of lubricated frictional pairs to measure friction, wear, friction pairs temperature and to compare used lubricants.

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Rautkari, Lauri, Milena Properzi, Frédéric Pichelin und Mark Hughes. „Surface modification of wood using friction“. Wood Science and Technology 43, Nr. 3-4 (27.09.2008): 291–99. http://dx.doi.org/10.1007/s00226-008-0227-0.

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LI, Jin-Qi, und Takeshi SHINODA. „Surface Modification by Friction Coating under Water“. Journal of the Society of Materials Science, Japan 49, Nr. 9Appendix (2000): 193–97. http://dx.doi.org/10.2472/jsms.49.9appendix_193.

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R??TTGER, J??RGEN, und REGINALD ELSON. „A Modification of Charnley Low-friction Arthroplasty“. Clinical Orthopaedics and Related Research &NA;, Nr. 211 (Oktober 1986): 154???163. http://dx.doi.org/10.1097/00003086-198610000-00023.

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Ding, Yuan-sheng. „Surface modification of calcium carbonate nanoparticles as hydraulic oil additives friction performance research“. Functional materials 25, Nr. 3 (27.09.2018): 564–67. http://dx.doi.org/10.15407/fm25.03.564.

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KOMVOPOULOS, K. „PLASMA-ENHANCED SURFACE MODIFICATION OF LOW LINEAR-DENSITY POLYETHYLENE CATHETERS“. Journal of Mechanics in Medicine and Biology 01, Nr. 01 (Mai 2001): 17–31. http://dx.doi.org/10.1142/s0219519401000064.

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Modification of the surface chemistry, topography, and frictional characteristics of medical-grade low linear-density polyethylene catheters with various plasma chemistries was accomplished in a radio-frequency (RF) vacuum chamber. Two different types of plasma treatments were examined. For surface texturing and chemistry modification, the catheters were treated with either He or CF 4 gases for 0.5–60 min at RF power in the range of 30–1000 W and working pressure between 0.2 and 2 Torr. For grafting of a low friction film, the catheters were exposed to pure Ar plasma at 400 W for 2 min (surface cleaning) and then to CH 4, CH 4/ CF 4, or H 2/ CF 4 plasmas at power of 250–550 W and working pressure of 0.2–0.8 Torr for 10–60 min (surface modification). The effects of the different plasma treatments on the surface texture, chemical behavior, and friction characteristics of the catheters are discussed in light of results obtained from contact surface profilometry, scanning electron microscopy, atomic force microscopy, contact angle measurements, infrared spectroscopy, and friction experiments. The findings of this study demonstrate that surface crosslinking and grafting of desirable functional groups by RF plasma treatment is an effective low-temperature surface modification technique for polymeric medical devices.

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Yu, Zhang, Tang und Gao. „Friction and Wear Behavior of Polyimide Composites Reinforced by Surface-Modified Poly-p-Phenylenebenzobisoxazole (PBO) Fibers in High Ambient Temperatures“. Polymers 11, Nr. 11 (03.11.2019): 1805. http://dx.doi.org/10.3390/polym11111805.

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(1) In order to improve the properties of antifriction and wear resistance of polyimide (PI) composite under high temperature conditions, (2) 3-Aminopropyltriethoxysilane (APTES) and Lanthanum (La) salt modifications were employed to manufacture poly-p-phenylenebenzobisoxazole (PBO)/PI composites with different interface properties. The representative ambient temperatures of 130 and 260 °C were chosen to study the friction and wear behavior of composites with different interface properties. (3) Results revealed that while both modification methods can improve the chemical activity of the surface of PBO fibers, the La salt modification is more effective. The friction coefficient of all composites decreases with the increase of sliding velocity and load at two temperatures, and the specific wear rate is increases. Contrary to the situation in the 130 °C environment, the wear resistance of the unmodified composite in the 260 °C environment is greatly affected by the sliding velocity and load, while the modified composites are less affected. Under the same test parameters, the PBO–La/PI composite has the lowest specific wear rate and friction coefficient, and (4) La salt modification is a more effective approach to improve the properties of antifriction and wear resistance of PI composite than APTES modification in high ambient temperatures.

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Kwon, Yong-Jai, Ichinori Shigematsu und Naobumi Saito. „Surface Modification of Aluminum Foams Using Friction Phenomena“. Journal of the Japan Institute of Metals 73, Nr. 7 (2009): 527–32. http://dx.doi.org/10.2320/jinstmet.73.527.

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Janakiraman, S., Jayachandra Reddy, Satish V. Kailash und K. Udaya Bhat. „Surface Modification of Steels Using Friction Stir Surfacing“. Materials Science Forum 710 (Januar 2012): 258–63. http://dx.doi.org/10.4028/www.scientific.net/msf.710.258.

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Friction stir surfacing is done to deposit commercial pure Al on medium carbon steel under open atmosphere conditions. Roughness of the substrate, normal load and tool rotation are the variables. Deposition is analysed with respect to continuity, width, composition and phase parameters. Good deposition is observed under a limited set of load and rotation speed. The deposit contains a mixture of steel and aluminium particles.

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Dissertationen zum Thema "Friction modification"

Galas, Radovan. „Friction Modification within Wheel-Rail Contact“. Doctoral thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2018. http://www.nusl.cz/ntk/nusl-367508.

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Předložená disertační práce se zabývá experimentálním studiem modifikátorů tření a maziv pro temeno kolejnice, které jsou aplikovány do kontaktu kola a kolejnice za účelem optimalizace adheze a redukce hluku. Hlavním cílem práce bylo objasnit vliv aplikovaného množství a složení těchto látek na adhezi v kontaktu. Hlavní pozornost byla věnována zejména potencionálním hrozbám souvisejících s kriticky nízkou adhezí, která může nastat po aplikaci těchto látek. Experimentální studium probíhalo v laboratorních i reálných podmínkách, konkrétně v tramvajovém provozu. V případě laboratorních experimentů byl využit komerční tribometr a dvoudiskové zařízení umožňující simulovat průjezd vozidla traťovým obloukem. Kromě samotné adheze bylo při experimentech sledováno také opotřebení a míra hluku. Výsledky ukázaly, že maziva pro temeno kolejnice jsou schopna poskytovat požadované třecí vlastnosti, nicméně jejich chování je silně závislé na aplikovaném množství. V případě předávkování kontaktu dochází ke kriticky nízkým hodnotám adheze, které vedou k výraznému prodloužení brzdné dráhy. V případě modifikátorů tření bylo ukázáno, že chování těchto látek je výrazně ovlivněno odpařováním základního média. Výsledky také ukázaly, že nadměrné množství částic pro modifikaci tření může způsobit kriticky nízké hodnoty adheze. U obou výše zmíněných typů produktů byl prokázán pozitivní vliv na míru opotřebení a míru poškození povrchu, zatímco významná redukce hluku byla dosažena pouze v případech, kdy došlo ke značnému poklesu adheze. V závěru této práce jsou uvedena doporučení pro další výzkumné aktivity v této oblasti.

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Chitsaz-Zadeh, Majid R. „The effects of rubber modification on friction and wear of epoxy networks“. Diss., Virginia Polytechnic Institute and State University, 1987. http://hdl.handle.net/10919/76092.

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An epoxy resin (Epon 828) was chemically modified with two different elastomers, poly(dimethyl-co-diphenyl) siloxane (PSX) and carboxyl-terminated butadiene-acrylonitrile (CTBN), to enhance its fracture toughness. The friction and wear of specimens modified with different amounts of elastomer were investigated in a pin-on-disk wear machine. An attempt was made to correlate the fracture toughness of the epoxy material to its fatigue wear rate for experiments in which a steel ball was sliding on a modified epoxy disk. A different type of experiment, modified epoxy pin sliding on an abrasive disk, was performed to detect whether abrasive wear of modified epoxies responds differently than fatigue wear to the fracture toughness. Other experiments were performed in which the wear debris produced during sliding was blown out of the interface to study its influence on friction and wear behavior. The effect of surface morphology on friction and wear was also studied. The results indicated that a marked improvement in fracture toughness was achieved for samples with higher elastomer content. Regardless of the type of the experiment, epoxy pin-on-abrasive disk or steel ball-on-epoxy disk, wear rates correlated positively with inverse of fracture toughness. Both friction coefficient and wear rate were found to be influenced by the removal of the wear debris, especially for samples with higher elastomer content. The friction coefficient was reduced for samples with higher elastomer content and this was attributed to the low surface energy of the elastomer. CTBN-modified epoxies exhibited lower friction coefficients than epoxies modified with polysiloxane. It was found that sample morphology had a significant effect on both friction coefficient and wear rate; the sample with approximately the same domain size but the least number of elastomeric domains exhibited the highest friction coefficient and the highest wear rate.
Ph. D.

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Bates, William. „Casting repair and Surface Modification of Aluminum Alloys using Friction Stir Processing (FSP)“. Thesis, Högskolan Väst, Avdelningen för Industriell ekonomi, Elektro- och Maskinteknik, 2021. http://urn.kb.se/resolve?urn=urn:nbn:se:hv:diva-16675.

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This thesis investigates using friction stir welding to repair common surface defects found in aluminum-silicon sand castings. Wherein, the effect of welding parameters: weld RPM, weld speed, and number of weld passes, were evaluated using hardness, porosity density, welding temperature, microstructure refinement as metrics. Therefrom, the results strongly suggest friction stir welding: reduces porosity size, reduces porosity density in a specific area, increases average hardness, improves hardness uniformity, increases surface roughness, redistributes microstructure features in a manner that theoretically improves strength, and maintains a welding temperature less than 660 degrees Celsius.

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Horvat, Frank E. „A Numerical and Experimental Investigation for the Modification and Design of a Gerolor Using Low Viscoscity Fluids“. University of Akron / OhioLINK, 2012. http://rave.ohiolink.edu/etdc/view?acc_num=akron1342585429.

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Chu, Yanyan. „Surface modification to aramid and UHMWPE fabrics to increase inter-yarn friction for improved ballistic performance“. Thesis, University of Manchester, 2015. https://www.research.manchester.ac.uk/portal/en/theses/surface-modification-to-aramid-and-uhmwpe-fabrics-to-increase-interyarn-friction-for-improved-ballistic-performance(d6e35803-9a2c-478a-a96d-a658292f8890).html.

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Manufacturing more reliable and lighter body armour using the fabrics with high-performance fibres is the development trend of ballistic protection device. However,increasing the reliability of the body armour normally needs to increase weight. Thisinvestigation aims to develop better ballistic performance of body armour withoutaffecting weight. Inter-yarn friction in quasi-static state in fabrics constructed for bodyarmour is one of the important factors affecting ballistic performance. This researchfocuses on increasing inter-yarn friction by surface modification methods for superiorballistic protection of woven fabrics. Finite element (FE) simulation is employed toanalyse the effects of inter-yarn friction on ballistic performance theoretically. BothAPPCVD and sol-gel methods are used to achieve the purpose of practically increasinginter-yarn friction. Ballistic experiments are conducted to evaluate ballistic performanceof the fabrics with different levels of inter-yarn friction after treatments. Through both numerical and experimental investigation, it is confirmed that increasinginter-yarn friction in quasi-static state can improve ballistic performance of fabrics. Theoverall energy absorption will be increased with the increase of inter-yarn frictionbecause higher inter-yarn friction generates higher resistance to the projectile, makesfabric structure more stable, leads to more involvement of the secondary yarns andincreases both KE and FDE percentages. Moreover, higher levels of inter-yarn frictionwill flatten the trauma and make the fabric response more globalised owing to the lesstransverse deflection ability. However, over high inter-yarn friction is counterproductivebecause of stress concentration on the primary yarns. For the surface modification, one of the aramid yarns, Twaron® yarn and one of theUHMWPE yarns, Dyneema® yarn, and their fabric products are used as the substrates. SEM analyses are used to characterise the morphology changes. Both FTIR and EDXanalyses are conducted to identify the coated substance. Based on coefficients of friction test and yarn pull-out test, the APPCVD treatment and sol-gel treatment have been proved as two effective ways to increase inter-yarn friction and at the same time the tensile properties of the yarns and the weight are almost unaffected. Moreover, sol-gel treatment has been established as an effective method for improvingballistic performance without significant weight increase, where the energy absorption ofthe Dyneema® fabric can be increased by 6.74%, and the trauma depth can be decreased by16.99% for Twaron® fabric panel and by10.73% for Dyneema® fabric panel.

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Skurka, Šimon. „Vývoj maziva pro temeno kolejnice“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2021. http://www.nusl.cz/ntk/nusl-443457.

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Friction modification within the wheel-rail interface is an important way of achieving ecologically friendly transportation of both persons and goods. This thesis aims to develop a new TOR lubricant, which will be able to maintain suitable frictional conditions while securing minimal adhesion required for traction. All measurements were carried out on tribometer MTM in the ball-on-disc configuration. In the first step, individual components were examined. More complex compositions were measured after that and the three best of them were compared with commercial TOR lubricants. The results show a good ability of developed compositions to maintain required adhesion, reduce wear, and all of them had resistivity against over-lubrication. Lastly, the process of lubricant verification before its application in real traffic was discussed.

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Kilman, Laureline. „Modification des propriétés de surface de couches DLC obtenues par PECVD/PVD dans le but d'optimiser leur comportement tribologique en milieu lubrifié : application aux moteurs thermiques pour véhicules terrestres“. Thesis, Limoges, 2015. http://www.theses.fr/2015LIMO0077.

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Les films minces de Diamond-Like Carbon sont couramment employés dans les moteurs automobiles. Leur très faible coefficient de frottement et leur haute dureté permettent en effet d’optimiser les performances et la durée de vie des véhicules. Cependant, la plupart des lubrifiants utilisés dans les moteurs sont élaborés pour fonctionner avec des surfaces métalliques. Il est donc envisageable d’améliorer le comportement tribologique de films de DLC en leur conférant un caractère métallique par l’introduction d’éléments dopants en quantité limitée et contrôlée (15 % au maximum) dans la matrice de carbone amorphe. Un réacteur de dépôt industriel muni d’une technologie de dépôt hybride a été utilisé. Celle-ci combine la PECVD pour l’élaboration du DLC hydrogéné à la pulvérisation cathodique magnétron pour le dopage. Quatre éléments ont été introduits à différentes concentrations dans le DLC : aluminium, cuivre, molybdène et niobium. Les propriétés physico-chimiques des dépôts ont été caractérisées par XPS (composition et liaisons chimiques) et spectroscopie Raman (structure). La dureté, le frottement et l’usure à sec et en conditions lubrifiées, ainsi que l’énergie de surface des films ont également été caractérisés. Deux études in situ de tenue des DLC en température ont été conduites par spectroscopie Raman. Par comparaison avec un film de DLC pur, le dopage entraîne une modification de la structure du DLC, et par conséquent une réduction de la dureté des couches. Cependant, excepté dans le cas du cuivre, ceci s’accompagne d’une diminution significative du coefficient de frottement et de l’usure à sec des couches. En revanche, en dépit de ce résultat prometteur, l’impact sur les propriétés tribologiques en milieu lubrifié est plus modéré et fortement lié à la composition du lubrifiant employé. Enfin le transfert industriel du dopage a été étudié et validé dans le cas du dopage à l’aluminium
Diamond-Like Carbon thin films are commonly used in automotive engines. Thanks to their very low friction coefficient and high hardness, it is indeed possible to optimize the performances and the lifetime of vehicles. However, most of the lubricants that are used in engines are designed to be in contact with metallic surfaces. So it might be possible to improve the global tribological behaviour of DLC films by giving them a metallic character. This can be achieved with the introduction of doping elements in limited and controlled amount (maximum 15 at. %) in the amorphous carbon matrix. An industrial scale reactor has been used with a hybrid coating technology combining PECVD for the deposition of hydrogenated DLC and magnetron sputtering for the introduction of the dopants. Four elements have been tested with various amounts in the DLC: aluminium, copper, molybdenum and niobium. The physico-chemical properties of the films have been characterized by XPS (chemical composition and bonding) and Raman spectroscopy (structure). Hardness, friction and wear in both dry and lubricated conditions, and surface energy have also been determined. Two in situ studies under temperature have been conducted by Raman spectroscopy for deposited thin films. Compared to a pure DLC, doping led to a modification of the structure resulting in a decrease in hardness. However, except for copper doping, a significant reduction of friction and wear in dry conditions is observed. Despite this promising result, the impact of doping on lubricated tribological behaviour is limited and strongly dependent on the composition of the lubricant itself. Finally, the industrial transfer of DLC metallic doping has been studied and validated

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Kluge, Axel, Johannes Henneberg, Chokri Cherif und Andreas Nocke. „Methods for adhesion/friction reduction of novel wire-shaped actuators, based on shape memory alloys, for use in adaptive fiber-reinforced plastic composites“. Sage, 2015. https://tud.qucosa.de/id/qucosa%3A35612.

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For fiber-reinforced plastic composites, fiber-matrix adhesion is a significant aspect of composite properties. While conventional lightweight structures are always aiming for high fiber-matrix adhesion, innovative and unconventional functional constructions require different concepts. The research work treating adaptive fiber-reinforced plastic composites with shape memory alloy wires presented here uses the approach of actuators freely movable within the composite. This is supposed to prevent mechanical tensions in the interfaces of actuator and composite structure, which would otherwise cause damages of the composite. This work examines hybrid yarns based on friction spinning technology, with shape memory alloy wires as their core component as well as glass fibers, and partly polypropylene, as their sheath component. Additionally, the surface properties of the shape memory alloy wires being used are modified by sanding and coating. The results of a characterization by pull-out testing clearly show that a coating of the shape memory alloy wires with an abherent causes considerable decrease in adhesion and friction in the interface and leads to the mobility of the shape memory alloy wires in the later composite. An even greater effect is attained by sheathing the hybrid yarns in an additional layer of polypropylene, compacting the yarn cross-section. Thus, the pull-out force could be reduced to 35–40% of the reference structure.

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Kománek, Jiří. „Konstrukce zařízení pro modifikaci topografie třecích povrchů“. Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2013. http://www.nusl.cz/ntk/nusl-230576.

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This master thesis is focused on design and construction of laboratory shot peening machine. This machine is determined for modification of the topography of the friction surfaces specimens. Two types of specimens are used. The first specimen is sphere with diameter 20-40 mm. The second specimen is cylinder with 9.6 mm diameter. In this thesis the setting parameters of shot peening for creation of surface with the micro-texture was described. Influence of the micro-texture to the coefficient of friction was investigated under mixed lubrication and slip condition.

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Coupe, Richard. „Towards faster skis : the development of new surface modifications and treatments to reduce overall friction in alpine skiing“. Thesis, University of Sheffield, 2013. http://etheses.whiterose.ac.uk/4798/.

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Developments in sport technology have been driven by competition and skiing is no exception. Skiing has evolved over many years making use of new materials and post-treatments methods, but in recent years progress has been limited. The low friction exhibited when sliding over snow and ice is governed by the tribological interaction between ski base and snow and the subsequent accumulation of a thin melt water film. The properties of new, innovative, blended ski base materials and post-treatment methods have been investigated using a range of methodologies. The incorporation of fluorinated hydrophobic silica nanoparticles into current ski waxes has been achieved. These nanoparticles have also been used as nano-abrasives to modify the physical surface structure of a ski base composed of ultra-high-molecular-weight polyethylene (UHMW-PE). Such polyethylene samples were also subjected to other physical treatment methods including abrasion with 120 grit, 800 grit sandpapers and 10-15μm silica particles combined with surface planing. The resultant surfaces were examined under a scanning electron microscope, contact angle tested and friction tested. The surface treatments which tended to be both physically and chemically hydrophobic were found to be beneficial at reducing friction in warm and wet snow conditions (snow temperature above -2°C). The addition of carbon black to UHMW-PE was also found to be beneficial in reducing static friction on snow. This was an interesting finding as the unmodified UHMW-PE was shown to be slightly more hydrophobic than UHMW-PE with added carbon from the contact angle evidence. Additionally, the visibly finer surface refinements with micro-scale to nano-scale features were also found to be more beneficial at reducing friction. A hydrophobic fumed silica, polydimethylsiloxane (PDMS), and perfluoropolyether (PFPE) were both blended with UHMW-PE to chemically modify the bulk material in contrast to traditional surface modification with hydrocarbon wax. PFPE, in particular, has been successfully blended with UHMW-PE to produce a novel base material for a downhill ski. Subsequent glide testing of skis, manufactured with this base material, in a range of conditions, demonstrated that the blended white base material closely matched the performance of skis with the current downhill black base material. The new blends also matched a hydrocarbon-waxed surface for hydrophobicity and were also found to be resistance to carbon coating at 5% levels of loading. Combined with the surface planing and nano scale abrasive structuring methods previously described, this novel base material has the potential to either compete or be a compliment to current wax treatment methods in order to achieve the small reductions of friction required to be successful in an alpine race.

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Bücher zum Thema "Friction modification"

Surface modification and mechanisms: Friction, stress and reaction engineering. New York: Marcel Dekker, 2004.

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Liang, Hong, und George E. Totten. Surface modification and mechanisms: Friction, stress and reaction engineering. New York: Marcel Dekker, 2004.

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Vityaz, P. A. Tribomechanical modification of friction surface by running-in in lubricants with nano-sized diamonds. Hauppauge, N.Y: Nova Science Publishers, 2010.

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Friction Stir Casting Modification for Enhanced Structural Efficiency. Elsevier, 2016. http://dx.doi.org/10.1016/c2014-0-02214-9.

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(Editor), George E. Totten, und Hong Liang (Editor), Hrsg. Surface Modification and Mechanisms: Friction, Stress, and Reaction Engineering. CRC, 2004.

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Liang, Hong, und Fasm, George E., Ph.d. Totten. Surface Modification And Mechanisms: Friction, Stress And Reaction Engineering. Marcel Dekker Inc, 2004.

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Mishra, Rajiv S., Glenn Grant und Saumyadeep Jana. Friction Stir Casting Modification for Enhanced Structural Efficiency: A Volume in the Friction Stir Welding and Processing Book Series. Elsevier Science & Technology Books, 2015.

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Effect of Surface Modification of Magnesium Alloy AZ91D by Friction Stir Processing. Karur, India: ASDF International, 2017.

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Rajeev, S. G. The Navier–Stokes Equations. Oxford University Press, 2018. http://dx.doi.org/10.1093/oso/9780198805021.003.0003.

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When different layers of a fluid move at different velocities, there is some friction which results in loss of energy and momentum to molecular degrees of freedom. This dissipation is measured by a property of the fluid called viscosity. The Navier–Stokes (NS) equations are the modification of Euler’s equations that include this effect. In the incompressible limit, the NS equations have a residual scale invariance. The flow depends only on a dimensionless ratio (the Reynolds number). In the limit of small Reynolds number, the NS equations become linear, equivalent to the diffusion equation. Ideal flow is the limit of infinite Reynolds number. In general, the larger the Reynolds number, the more nonlinear (complicated, turbulent) the flow.

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Buchteile zum Thema "Friction modification"

Berman, Alan, und Jacob Israelachvili. „Control and Minimization of Friction via Surface Modification“. In Micro/Nanotribology and Its Applications, 317–29. Dordrecht: Springer Netherlands, 1997. http://dx.doi.org/10.1007/978-94-011-5646-2_23.

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Wallstabe, R., J. Schneider und K. H. Zum Gahr. „Influence of Surface Modification on Dry Friction Performance of Alumina Mated Against Steel“. In Friction, Wear and Wear Protection, 369–75. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2011. http://dx.doi.org/10.1002/9783527628513.ch46.

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Wang, Guorui. „Interfacial Friction and Adhesion Between Graphene and Silicon“. In Characterization and Modification of Graphene-Based Interfacial Mechanical Behavior, 67–96. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-8029-1_4.

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Rodelas, Jeff, John Lippold, James Rule und Jason Livingston. „Friction Stir Processing as a Base Metal Preparation Technique for Modification of Fusion Weld Microstructures“. In Friction Stir Welding and Processing VI, 323–31. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118062302.ch38.

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Eliseev, Alexander A., Tatiana A. Kalashnikova, Andrey V. Filippov und 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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Wu, Yujuan, Liming Peng, Feiyan Zheng, Xuewen Li, Dejiang Li und Wenjiang Ding. „Microstructure Modification and Performance Improvement of Mg-RE Alloys by Friction Stir Processing“. In Magnesium Technology 2013, 189–96. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2013. http://dx.doi.org/10.1002/9781118663004.ch31.

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Wu, Yujuan, Liming Peng, Feiyan Zheng, Xuewen Li, Dejiang Li und Wenjiang Ding. „Microstructure modification and performance improvement of Mg-RE alloys by friction stir processing“. In Magnesium Technology 2013, 191–96. Cham: Springer International Publishing, 2013. http://dx.doi.org/10.1007/978-3-319-48150-0_31.

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Venkatrao, Mane, G. Ranga Janardana, U. Satish Naidu und S. Venkatesh. „Surface Modification of AA 6351 for Improvement of Mechanical Properties Using Friction Stir Processing“. In Lecture Notes on Multidisciplinary Industrial Engineering, 139–58. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-7643-6_12.

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Harrison, J. A., S. B. Sinnott, C. T. White, D. W. Brenner und R. J. Colton. „Molecular Dynamics Simulation of Atomic-Scale Adhesion, Deformation, Friction, and Modification of Diamond Surfaces“. In Forces in Scanning Probe Methods, 175–81. Dordrecht: Springer Netherlands, 1995. http://dx.doi.org/10.1007/978-94-011-0049-6_18.

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Patel, Surendra Kumar, Virendra Pratap Singh und Basil Kuriachen. „Modification of Aluminium Alloy Surface Composite Reinforced with ZrO2 Particles Fabricated Through Friction Stir Processing“. In Lecture Notes on Multidisciplinary Industrial Engineering, 579–86. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-32-9433-2_50.

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Konferenzberichte zum Thema "Friction modification"

Bolander, Nathan W., Farshid Sadeghi und Gordon R. Gerber. „Piston Ring Friction Reduction Through Surface Modification“. In ASME 2005 Internal Combustion Engine Division Fall Technical Conference. ASMEDC, 2005. http://dx.doi.org/10.1115/icef2005-1346.

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A numerical model has been developed to investigate the effects of surface modifications on the lubrication condition and frictional loss at the interface between a piston ring and cylinder liner. The effects of boundary and mixed lubrication conditions were included through the use of a fully deterministic mixed lubrication model, which provides detailed information of the rough contact zone throughout the stroke. The effects of non-Gaussian surface characteristics (e.g. skewness) on the cycle-average frictional performance are discussed. Surface modifications in the form of circular profile dimples were added to the cylinder liner and their effects were investigated. The modified cylinder liner was shown to reduce the cycle-average coefficient of friction by 55–65%, while total energy loss per cycle was reduced by 20–40%.

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Szeri, Andras Z. „Low Friction Composite Film Bearings“. In ASME/STLE 2007 International Joint Tribology Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/ijtc2007-44083.

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Experts estimate that in 1978 alone over 4.22 × 1018 joule of energy were lost in the United States due to simple friction and wear — enough energy to supply New York City for the entire year. Energy loss through friction in tribo-elements is a major factor in limits on energy efficiency [1]. The two major approaches that have been pursued in the past for reducing frictional losses in tribological contacts were surface modification techniques such as laser texturing and modification of lubricant properties. Here we advocate yet another option, modification of the structural character of the lubricant film. The Composite-Film bearing (CFB) is investigating this third possibility.

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Chen, Wengang, Xueyuan Liu und Lili Zhen. „Friction Characteristics Of Surface Modification 304 Steel Under Wind Lubrication“. In 2016 5th International Conference on Advanced Materials and Computer Science (ICAMCS 2016). Paris, France: Atlantis Press, 2016. http://dx.doi.org/10.2991/icamcs-16.2016.212.

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Suzuki, Yoshihiko, und Gan Chen. „A Modification of the LuGre Friction Model for Potential Energy“. In 2020 59th Annual Conference of the Society of Instrument and Control Engineers of Japan (SICE). IEEE, 2020. http://dx.doi.org/10.23919/sice48898.2020.9240466.

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Quinn, D. Dane. „A New Regularization of Coulomb Friction“. In ASME 2002 International Mechanical Engineering Congress and Exposition. ASMEDC, 2002. http://dx.doi.org/10.1115/imece2002-32402.

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We present a new regularization for Coulomb’s law of friction for single point contacts. This modification permits a straightforward application of friction within existing numerical simulations. Similar to existing regularizations, the proposed modification to Coulomb frictions leads to continuous representation of friction and does not require the separate identification of transitions between slip and stick. However, unlike more common regularizations, the current reformulation maintains an equilibrium structure identical to the classical, discontinuous form of Coulomb friction. The implementation and performance of this regularization is illustrated by a simple one degree-of-freedom system in which stick-slip motion induced by sliding friction is of primary importance. The simulations illustrate the existence of non-trivial equilibrium states and the ability of the current regularization toprovide a computationally efficient scheme for simulating the dissipation arising from sliding friction.

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Komvopoulos, K. „Surface Adhesion and Friction in Microelectromechanical Systems: Measurement and Modification Techniques“. In World Tribology Congress III. ASMEDC, 2005. http://dx.doi.org/10.1115/wtc2005-64107.

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Microscopic devices that can perform sensing, actuation, and control, known as microelectromechanical systems (MEMS), are projected to lead to new technologies with profound impacts in science and engineering. However, there are several limitations that must be overcome before MEMS could be fully utilized in various applications. In particular, because of the low stiffness and large surface-to-volume ratio of MEMS, high adhesion and friction forces between proximity and contacting surfaces limit the device efficiency and often lead to premature failure. Basic study of adhesion and friction under MEMS conditions requires special microdevices fabricated by surface micromachining. The basic features of such MEMS devices are presented herein together with suitable surface modification techniques for reducing surface adhesion and friction, such as surface texturing and deposition of low surface energy solid films and self-assembled monolayers.

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Abdulmalik, S. S., R. Ahmad und M. B. A. Asmael. „Surface modification of hypereutectic Al-Si alloy via friction stir process“. In 7TH INTERNATIONAL CONFERENCE ON MECHANICAL AND MANUFACTURING ENGINEERING: Proceedings of the 7th International Conference on Mechanical and Manufacturing Engineering, Sustainable Energy Towards Global Synergy. Author(s), 2017. http://dx.doi.org/10.1063/1.4981178.

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Musey, Kimberley, Seri Park und John McFadden. „Exploring Friction Modification to Improve the Safety of Horizontal Curve Roadways“. In International Conference on Transportation and Development 2016. Reston, VA: American Society of Civil Engineers, 2016. http://dx.doi.org/10.1061/9780784479926.081.

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Yu, Zhenzhen, Zhili Feng, Hahn Choo und Sven Vogel. „Texture Modification and Ductility Enhancement in Mg Alloy Through Friction Stir Processing“. In ASME 2011 International Mechanical Engineering Congress and Exposition. ASMEDC, 2011. http://dx.doi.org/10.1115/imece2011-65693.

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The effects of friction stir processing (FSP) parameters, i.e., rotation and travel rates of the processing tool, on the texture modification and ductility enhancement of an Mg alloy AZ31B were investigated. With the systematic change in processing parameters as a function of the Zener-Hollomon parameter, a transition of different crystallographic texture was observed through neutron diffraction measurement, which correlated well with the changes in deformation and recrystallization mechanism activated during the processing. The variation in the texture leads to dramatic changes in the strength and ductility in the stir zone of the processed Mg plate. A maximum of three-fold increase in the ductility was achieved in the Mg alloy through FSP when the Zener-Hollomon parameter exceeds 1012 s−1 which is associated with low rotation speed and high travel speed processing conditions.

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Michaux, Michael A., Al Ferri und Kenneth A. Cunefare. „Modification of Friction-Induced Instability in a Disk System Through Dither Excitation Forces“. In ASME 2007 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/detc2007-35176.

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This paper employs a continuous rotor model and a contacting SDOF system to examine dither’s role in stabilizing friction-induced oscillations. The disc rotor is modeled by a thin, clamped-free annular plate. Under the action of tangential dither, the frictional contact load is represented by a sinusoidally-varying follower force. The stability of the combined system, with and without dither signals, is assessed using multiple-scale analysis and Floquet theory. It is shown that dither is capable of quenching instabilities at some rotor speeds while at the same time producing new instabilities at other rotor speeds. The results suggest that one mechanism by which dither can suppress squeal is by changing the rotor speeds at which squeal vibrations occur.

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Berichte der Organisationen zum Thema "Friction modification"

Blau, Peter Julian, Jun Qu, Yan Zhou, Kevin M. Cooley, DONALD L. ERDMAN, III und Stephen M. Hsu. Friction Reduction through Surface Modification. Office of Scientific and Technical Information (OSTI), Oktober 2014. http://dx.doi.org/10.2172/1162088.

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Sneed, Lesley H., und Dane M. Shaw. Lightweight Concrete Modification Factor for Shear Friction. Precast/Prestressed Concrete Institute, 2013. http://dx.doi.org/10.15554/pci.rr.comp-007.

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Wei, Fulu, Ce Wang, Xiangxi Tian, Shuo Li und 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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