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Physical characterisation of a commercial magnesium stearate powderBrown, Dawn Gayatri January 1995 (has links)
No description available.
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The behaviour of colloids in lubricated contactsChinas, Fernando January 2000 (has links)
No description available.
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An investigation of the dynamic behaviour of floating ring bearing systems and their application to turbogeneratorsLeung, P. S. January 1988 (has links)
No description available.
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Wear properties of artificial hip joint materialsWatters, Eamon Patrick John January 2000 (has links)
No description available.
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Highly loaded hybrid journal bearingsElliott, Tony William January 1989 (has links)
No description available.
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An experimental and analytical investigation of screen printing process fundamentalsMitchell, M. C. January 1999 (has links)
No description available.
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The tribology of hard bearing surfaces for use in hip prosthesesScholes, Susan Claire January 1999 (has links)
No description available.
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Solid Lubrication Mechanisms in Laser Deposited Nickel-titanium-carbon Metal Matrix CompositesMogonye, Jon-Erik 12 1900 (has links)
A Ni/TiC/C metal matrix composite (MMC) has been processed using the laser engineered net shaping (LENS) process from commercially available powders with a Ni-3Ti-20C (atomic %) composition. This processing route produces the in-situ formation of homogeneously distributed eutectic and primary titanium carbide and graphite precipitates throughout the Ni matrix. The composite exhibits promising tribological properties when tested in dry sliding conditions with a low steady state coefficient of friction (CoF) of ~0.1 and lower wear rates in comparison to LENS deposited pure Ni. The as deposited and tribologically worn composite has been characterized using Auger electron spectroscopy, scanning electron microscopy (SEM), X-ray diffraction, high resolution transmission electron microscopy (HRTEM) with energy dispersive spectroscopy (EDS), dual beam focused ion beam SEM (FIB/SEM) serial sectioning and Vickers micro-hardness testing. The evolution of subsurface stress states and precipitate motion during repeated sliding contact has been investigated using finite element analysis (FEA). The results of FIB/SEM serial sectioning, HRTEM, and Auger electron spectroscopy in conjunction with FEA simulations reveal that the improved tribological behavior is due to the in-situ formation of a low interfacial shear strength amorphous carbon tribofilm that is extruded to the surface via refined Ni grain boundaries.
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Modeling Moving Droplets: A Precursor Film ApproachBryant, Benjamin 01 January 2003 (has links)
We investigate the behavior of moving droplets and rivulets, driven by a combination of gravity and surface shear (wind). The problem is motivated by a desire to model the behavior of raindrops on aircraft wings. We begin with the Stokes equations and use the approximations of lubrication theory to derive the specific thin film equation relevant to our situation. This fourth-order partial differential equation describing the height of the fluid is then solved numerically from varying initial conditions, using a fully implicit discretization for time stepping, and a precursor film to avoid singularities at the drop contact line. Results describing general features of droplet deformation, limited parameter studies, and the applicability of our implementation to the long-term goal of modeling wings in rain are discussed.
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The wear and thermo-elastohydrodynamic behavior of thrust washer bearings under non-axisymmetric loadsJackson, Robert Lee, III 12 April 2004 (has links)
The goal of this work is to investigate the physical mechanisms that distress thrust washer bearings through physical modeling and numerical techniques. The thrust washer bearing is subjected to non-axisymmetric loads within the planetary gear sets of automatic transmissions in automobiles. In practice the thrust washer bearing often distresses severely and unpredictably, causing transmission breakdown and liability issues. A specially designed thrust washer bearing test rig allows for controlled variation of the operational parameters (speed, load, lubrication flow rate, etc.) governing the tribological behavior of the washer. The test rig also records pertinent real-time data (frictional torque and temperature) from the bearing. In conjunction with the experimental model, a new comprehensive numerical simulation of thrust washer bearings is constructed. The numerical simulation incorporates the effects of macro-scale deformation, micro-scale surface asperity contact, heat generation, boundary and full film lubrication. To model surface asperity contact, the current work performs an extensive finite element study of elasto-plastic spherical contact. The numerical and experimental results show that significant sliding asperity contact can cause high temperatures, high friction, and severe wear.
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