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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 23 for “"Coefficients of friction"”.
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Design of a feeder for miniature components: Investigation into the mode of operation and application of vibrating oblique blade
A brief review of work on the automatic feeding of silicon chips using standard electro-magnetic bowl feeders is given together with a review on a feeding method using a device consisting of a flat, chip-transporting surface and an obliquely angled, vibrating blade, positioned so as to plough the …
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Molecular dynamics simulations of metallic friction and of its dependence on electric currents: development and first results
… dynamics (MD) code to run slider-on-block friction experiments for Al and Cu. Both objects are allowed to evolve freely and show marked deformation despite the hardness difference. We recover realistic coefficients of friction and verify the importance of cold-welding and plastic …
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Mechanical Characterization and Modeling of Solid Oxide Fuel Cell Electrolytes with Honeycomb Support
<p>Planar solid oxide fuel cells (SOFCs) are made up of repeating sequences of electrolytes, electrodes, seals, interconnects, and current collectors. For electro-chemical reasons it is best to keep the electrolyte as thin as possible. However, for electrolyte-supported cells, the thin electrolytes …
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Infrared microscope studies of surface temperatures produced by friction with graphite-epoxy and carbon-PEEK composites
… to measure the temperatures at the interfaces of graphite-epoxy and carbon-PEEK composites in unidirectional sliding contact with sapphire. Effects of fiber orientation and velocity on tribological parameters were examined. Oscillating contact conditions with graphite-epoxy were also examined. …
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Ermittlung von Materialkennwerten von Kunststoffschüttgütern und Simulation der Vorgänge im Einzugsbereich von konventionellen Einschneckenextrudern
… are already frequently used for the design of single-screw extruders for plastics processing and have the advantage of saving not only time and personnel, but are also economical. In order to obtain simulation results for the feed section of single-screw extruders with a good accuracy, not …
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Some studies of frictional properties of fabrics
The frictional (fricative) properties of some 23 fabrics are reported. These properties include frictional resistance, amplitude of resistance, number of peaks, difference between static and kinetic frictional resistance in addition to coefficients of friction, all determined by trace analysis. …
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Tribological behavior of unfilled and carbon fiber reinforced polyether ether ketone/polyether imide composites
The friction and wear of injection molded Poly(ether ether ketone) (PEEK) and Poly(ether imide) (PEI), PEEK/PEI blends with the weight compositions of 50/50 %, 70/30 %, and 85/15 %, with and without short carbon fibers were measured in a pin(52100 steel ball)-on-disk(polymer blend) configuration …
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MODELING OF ARCHING UNREINFORCED MASONRY WALLS SUBJECTED TO BLAST LOADINGS
<p>Masonry is one of the most commonly used materials in building construction throughout the world. Unreinforced masonry (URM) walls typically have very low flexural capacities and tend to posses brittle failure modes. Due to brittle nature of URM walls, it is critical to predict the behaviour of …
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Ionic liquids as additives for biodegradable polyactic acid
… solubility parameters calculations. The effects of the IL containing a decanoate anion were more pronounced on lubrication and degradation as evidenced by reduced melt viscosities and accelerated thermal/hydrolytic degradation; this IL could also considered as a more effective plasticizer based …
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Micro Surface Texturing for Friction Control
… has gained momentum as a way to control the friction which is involved in various applications and systems, such as components of internal combustion engines, dies and punches of the metal forming processes and Micro-electrical-mechanical Systems (MEMS). This dissertation demonstrates that …
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Development of a Colonoscopy Simulator for the Evaluation of Colonoscopy Devices
… their performance. At the preclinical stage of the device development the evaluation is typically performed in laboratory experiments. For these experiments an artificial environment is required which can recreate the anatomical and biomechanical features of the colon.<br/><br/>A colonoscopy …
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The friction coefficient of soft contact lens surfaces in relation to comfort and performance
The soft contact lenses of today are made from a variety of hydrogel materials. These materials have different properties in terms of water content, monomers, hardness and other tensile characteristics. It is likely that the frictional properties also vary between materials. It is known that …
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The prediction of applied force and torque during flat hot rolling.
… force and torque produced under a wide range of flat hot rolling conditions.The technique used is based on the numerical solution to the Von Karman equation developed by Alexander and applied to cold rolling conditions. In the present work, extensions have been made that allow the use of a …
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Frictional oscillations in elastomeric sliding
… rotating in an elastomeric bushing. The focus of the research is to determine the conditions under which noise or stick-slip occurs. Elastomers tested include natural rubber with 0,5,10, 20, and 50 phr (parts per hundred rubber) carbon black, butyl, polydimethyl siloxane, and fluorocarbon. The …
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Vibratory conveyors
A review of the previous work on the mechanics of vibratory conveying is given., It is found that several theoretical studies have been made in the past but the predictions of the theories and the comparisons of these' with experimental results have only been applicable to a very limited range of …
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Mass wasting and the Coriolis effect on asteroid Vesta
This work investigates the influence of the Coriolis force on mass motion related to the Rheasilvia impact basin on asteroid (4) Vesta's southern hemisphere. The giant basin is 500km in diameter, with a centre which nearly coincides with the rotation axis of Vesta. The Rheasilvia basin partially …
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Geomechanical and tectonic investigations into the geologic history of Mars at local, regional, and global scales
The primary goal of this dissertation is to understand the geologic history of Mars through the use of geomechanical techniques to investigate tectonic deformation of the lithosphere at local, regional, and global scales. Techniques that have their origins in terrestrial geology are applied to Mars …
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Modelling and simulation in tribology of complex interfaces
Tribology is known as the science of surfaces in relative motion and involves complex interactions over multiple length and time scales. Therefore, friction, lubrication and wear of materials are intrinsically highly multiphysics and multiscale phenomena. Several modelling and simulation tools have …
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The effect of liner design upon charge motion in a rotary mill
… are used extensively to reduce the coarse rocks of mined ores down to a product fine enough to facilitate the extraction of the valuable minerals. On the South African gold mines alone about 110 million tons of ore is mined annually, at a power cost of about R90 million, and a liner material cost …
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Biotribology: Studies of the Effects of Biochemical Environments on the Wear and Damage of Articular Cartilage
Tribology is the science of interacting surfaces in relative motion. It is specifically concerned with the friction, wear and lubrication of these surfaces. Although tribology has conventionally been associated with the surface interaction of mechanical systems, concepts of tribology have also been …
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