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Keywords: friction
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Proceedings Papers

Proc. ASME. IJTC2012, ASME/STLE 2012 International Joint Tribology Conference, 331-333, October 7–10, 2012
Publisher: American Society of Mechanical Engineers
Paper No: IJTC2012-61213
... During friction under shock conditions, interface is submitted to very strong heat flux. Thus, it may reach a temperature as high as melt temperature of one of the materials constituting the contact. As a consequence, the income and outcome of heat at the interface governs the friction...
Proceedings Papers

Proc. ASME. IJTC2011, ASME/STLE 2011 Joint Tribology Conference, 1-3, October 24–26, 2011
Publisher: American Society of Mechanical Engineers
Paper No: IJTC2011-61008
... 10 02 2012 Low friction polytetrafluoroethylene (PTFE) has been studied extensively and is widely used in tribological applications in bulk form. Tribological properties of thin film PTFE are less reported due to its poor wear resistance. Here, we show that by incorporating Au...
Proceedings Papers

Proc. ASME. IJTC2010, STLE/ASME 2010 International Joint Tribology Conference, 281-283, October 17–20, 2010
Publisher: American Society of Mechanical Engineers
Paper No: IJTC2010-41034
... 22 04 2011 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...
Proceedings Papers

Proc. ASME. IJTC2007, ASME/STLE 2007 International Joint Tribology Conference, Parts A and B, 11-13, October 22–24, 2007
Publisher: American Society of Mechanical Engineers
Paper No: IJTC2007-44131
... 26 03 2009 The friction and wear properties of nanocrystalline cobalt (nc Co) with a grain size of 20±5 nm and a hardness of 503±13 HV were studied using a pin-on-disc tribometer. Tests performed under unlubricated sliding conditions in ambient air showed that large tribolayer area...
Proceedings Papers

Proc. ASME. TRIB2003, Contact Mechanics, 1-4, October 26–29, 2003
Publisher: American Society of Mechanical Engineers
Paper No: 2003-TRIB-0256
... 09 01 2009 We have long known that tangential contact forces and the friction coefficient at a sliding contact arises not due to some “law” but as a result of contact geometric and material properties in combination with physical processes that are not always accessible to direct...
Proceedings Papers

Proc. ASME. TRIB2003, Contact Mechanics, 25-30, October 26–29, 2003
Publisher: American Society of Mechanical Engineers
Paper No: 2003-TRIB-0260
... 09 01 2009 This paper describes tools for numerical modelisation which enable the understanding of the appearance of the vibration of structure generated by the frictional contact between two bodies (the excitation source being friction). The dynamic finite element code PLASTD is used...
Proceedings Papers

Proc. ASME. TRIB2003, Contact Mechanics, 31-33, October 26–29, 2003
Publisher: American Society of Mechanical Engineers
Paper No: 2003-TRIB-0261
... Friction instability roughness vibration noise One type of troublesome friction-induced noise, common in brakes, clutches and mechanical seals, is high frequency chirp or squeal. The frequencies at which these noises and underlying vibrations occur typically range from around 1 kHz...
Proceedings Papers

Proc. ASME. TRIB2004, ASME/STLE 2004 International Joint Tribology Conference, Parts A and B, 1617-1626, October 24–27, 2004
Publisher: American Society of Mechanical Engineers
Paper No: TRIB2004-64310
... along the tool rake face, with little or no change in the friction condition over much of this face. However, the effectiveness of the lubricating action is significantly enhanced when a controlled low-frequency modulation of sufficient amplitude, such as to break the chip-tool contact, is imposed...
Proceedings Papers

Proc. ASME. TRIB2004, ASME/STLE 2004 International Joint Tribology Conference, Parts A and B, 387-394, October 24–27, 2004
Publisher: American Society of Mechanical Engineers
Paper No: TRIB2004-64136
..., dissolution of alloying constituents from the bronze bearing material dissolute into the synthetic ester lubricant occur leading to the formation of a copper enriched bearing surface layer. Tin-bronze with synthetic ester lubricant showed more stable friction values and roughly ten times better wear results...
Proceedings Papers

Proc. ASME. TRIB2004, ASME/STLE 2004 International Joint Tribology Conference, Parts A and B, 737-747, October 24–27, 2004
Publisher: American Society of Mechanical Engineers
Paper No: TRIB2004-64388
..., Cavitation, Friction NOMENCLATURE B bearing width D width of computed domain K convergence ration (h1/ho) R cylinder radius U1 speed of lower surface a speed of sound al speed of sound in liquid phase av speed of sound in vapour phase ho minimum film thickness h1 inlet film thickness h3 recess depth psat...
Proceedings Papers

Proc. ASME. TRIB2004, ASME/STLE 2004 International Joint Tribology Conference, Parts A and B, 1549-1554, October 24–27, 2004
Publisher: American Society of Mechanical Engineers
Paper No: TRIB2004-64251
... in the absence of preload (gram-load). However in the presence of preload, pitch moment due to dimple friction must be considered. We shall show by elementary beam theory that lever-arm of the dimple friction is related to the flexure bow-height, and that to minimize uncertainty in the pitch moment, hence...
Topics: Friction
Proceedings Papers

Proc. ASME. IJTC2006, Part B: Magnetic Storage Tribology; Manufacturing/Metalworking Tribology; Nanotribology; Engineered Surfaces; Biotribology; Emerging Technologies; Special Symposia on Contact Mechanics; Special Symposium on Nanotribology, 997-998, October 23–25, 2006
Publisher: American Society of Mechanical Engineers
Paper No: IJTC2006-12337
... and transfer tribolayers. Wear Friction Nanocrystalline structure Titanium Proceedings of IJTC2006 NO N S. gic la esia rsi machining is found to have a nanocrystalline structure with ~100 nm size grains. The hardness and strength of the nanostructures are seen to be substantially higher than those...
Proceedings Papers

Proc. ASME. IJTC2006, Part A: Tribomaterials; Lubricants and Additives; Elastohydrodynamic Lubrication; Hydrodynamic Lubrication and Fluid Film Bearings; Rolling Element Bearings; Engine Tribology; Machine Components Tribology; Contact Mechanics, 197-205, October 23–25, 2006
Publisher: American Society of Mechanical Engineers
Paper No: IJTC2006-12120
... and are investigated using Reynold’s Equation. For each shape, the area fraction of the microasperity is varied between 0.2 and 0.8, and the asperity height is varied between 0.3 and 5 micron. The calculation for load capacity and friction coefficient indicates that there are values for asperity height where load...
Proceedings Papers

Proc. ASME. IJTC2006, Part A: Tribomaterials; Lubricants and Additives; Elastohydrodynamic Lubrication; Hydrodynamic Lubrication and Fluid Film Bearings; Rolling Element Bearings; Engine Tribology; Machine Components Tribology; Contact Mechanics, 533-542, October 23–25, 2006
Publisher: American Society of Mechanical Engineers
Paper No: IJTC2006-12023
... 07 10 2008 In an engine, the valvetrain contributes about 6–10 % of the total frictional loss depending on architecture. The cam and the tappet contact in a direct acting mechanical bucket type valvetrain offers opportunities for friction reduction. Work has been done in the past...
Proceedings Papers

Proc. ASME. IJTC2006, Part A: Tribomaterials; Lubricants and Additives; Elastohydrodynamic Lubrication; Hydrodynamic Lubrication and Fluid Film Bearings; Rolling Element Bearings; Engine Tribology; Machine Components Tribology; Contact Mechanics, 591-602, October 23–25, 2006
Publisher: American Society of Mechanical Engineers
Paper No: IJTC2006-12090
... 07 10 2008 In this research, three types of lubricants are investigated for their effects on the friction and torque-tension relationships in threaded fastener applications. Investigated lubricants included oils, greases, and solid film lubricants that were applied to the threads...
Proceedings Papers

Proc. ASME. IJTC2006, Part B: Magnetic Storage Tribology; Manufacturing/Metalworking Tribology; Nanotribology; Engineered Surfaces; Biotribology; Emerging Technologies; Special Symposia on Contact Mechanics; Special Symposium on Nanotribology, 1053-1062, October 23–25, 2006
Publisher: American Society of Mechanical Engineers
Paper No: IJTC2006-12259
... 07 10 2008 The effect of surface textures on the friction of Poly(dimethylsiloxane) (PDMS) elastomer was investigated at both macro and micro scales using a nanoindenter. Friction tests were conducted by means of a stainless-steel bearing ball with a diameter of 1.6mm (macro scale...
Proceedings Papers

Proc. ASME. IJTC2006, Part B: Magnetic Storage Tribology; Manufacturing/Metalworking Tribology; Nanotribology; Engineered Surfaces; Biotribology; Emerging Technologies; Special Symposia on Contact Mechanics; Special Symposium on Nanotribology, 923-928, October 23–25, 2006
Publisher: American Society of Mechanical Engineers
Paper No: IJTC2006-12077
... 07 10 2008 Lubricants bases for metalworking applications make extensive use of water-soluble additives to reduce friction and wear. In order to do such task, these additives must form a lubricating film that separates the contact surfaces, thus imparting good surface finishes...
Proceedings Papers

Proc. ASME. IJTC2006, Part B: Magnetic Storage Tribology; Manufacturing/Metalworking Tribology; Nanotribology; Engineered Surfaces; Biotribology; Emerging Technologies; Special Symposia on Contact Mechanics; Special Symposium on Nanotribology, 1175-1181, October 23–25, 2006
Publisher: American Society of Mechanical Engineers
Paper No: IJTC2006-12207
... 07 10 2008 The fabrication of nanocomposite coatings consisting of a hard matrix and solid lubricant islands holds promise developing highly wear resistant coatings with low friction coefficients. We have conducted research on methods for creating hard coating layers with a pattern...