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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 41 for “"Wear mechanisms"”.
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Wear mechanisms of chemically crosslinked hydrogels under mild abrasion
… this application would be highly susceptible to wear. While the fluid component of these materials mediates low friction sliding, the hydrophilic polymer network of hydrogels can endure only a limited number of sliding cycles. For hydrogels to be viable candidates to replace osteoarthritic …
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An investigation of friction and wear mechanisms in selected thermoplastics
… Microscope (SEM) observations of abrasive wear of a polymer disk sliding against metal asperity models. The investigator was unable to observe actual particle formation but did identify elastic and plastic deformation of the polymer, and a debris buildup and extrusion process occurring at …
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Study of Wear Mechanisms in Braking Systems with HVOF-Coated Discs
… of the major sources of these emissions is the wear of brake pads and discs. The experimental work presented in this thesis has been performed within the European project called LOWBRASYS that aims at reducing the particulate matter emissions due to the wear of the components of braking systems. …
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Erosion and rolling contact wear mechanisms in silicon nitride hybrid bearings.
… restricted increase in speed due to material wear, which eventually affected the life of bearings. Being low saturation temperature fluids, change of phase is very common in refrigerants and cryogenic liquids, which lead to cavitation. Silicon nitride rolling elements with different sintering …
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Abrasion-corrosion of cast CoCrMo in simulated hip joint environments
… patients in recent years due to their improved wear performance compared to conventional metal-on-polymer bearings. MoM bearings operate at body temperature within a corrosive joint environment and therefore are inevitably being subjected to wear and corrosion as well as the combined action of …
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Modelling of freeze layer formation and refractory wear in direct smelting process
… the formation of freeze layers and refractory wear on water-cooling elements within direct smelting processes through the use of computational modelling techniques. The motivation of performing this work is to examine the cooling of regions of the Smelt Reduction Vessel of the HIsmelt process …
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Three-dimensional modeling of sealing and wear of XTS-210 engine Apex seals
… the Wankel have drawbacks such as excessive seal wear, combustion gas leaks and limited durability. LiquidPiston’s X-Engine features an innovative geometry designed to solve these problems, offering compatibility with compression-ignition fuels, increased efficiency and simplified mechanical …
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Abrasive wear with particular reference to digger teeth
Abrasive wear occurs when a contact associated with stress between a metal surface and a herd particle (frequently of mineral origin) leads to friction between the two. In a very wide range of industrial applications, abrasive wear is the main reason for component and equipment repair or …
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Optical breakdown acoustics : transduction and sensing underwater
… are exposed to harsh conditions that can wear down the structures through wave loading and corrosion. Because of these wear mechanisms, maritime structures require regular inspections to identify early signs of damage or fatigue. Currently, inspections are performed visually or with …
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The effect of operating parameters on the wear behaviour of disc poppet valves in reciprocating slurry pumps
… out to determine the factors controlling the wear characteristics of disc poppet valves in reciprocating slurry pumps used in the transportation of quartzite slurries. A laboratory test rig has been designed and built which closely simulates the operating conditions experienced by slurry pump …
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Tribopolymerization: ceramic lubrication under high loads and high speeds
… to determine the effects of load and speed on wear reduction. At low speeds, the monomers showed significant wear reductions, from 37 percent up to 98 percent, compared to pure hexadecane lubrication. Changes in load at low speed had mixed effects dependent on the monomer. At high speeds, the …
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Wear of fine pearlite, nanostructured bainite and martensite
Abrasion is a form of wear prominent particularly in the agricultural, mining, mineral and transportation industries. The cost of abrasive wear to the national economy is estimated to be about 1% of the gross national product, and it can compromise the safety and reliability of engineering …
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Factors Affecting the Durability of 5.25 Inch Floppy Diskette Media and its Mechanisms of Wear
… targeted towards establishing the durability and mechanisms of wear involved in the use of 5.25 inch magnetic floppy diskettes with particular reference to the media manufactured by the Minnesota Mining and Manufacturing Company, 3M Center, St. Paul, Minnesota, USA. In the present work most stress …
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Micro and nano composites composed of a polymer matrix and a metal disperse phase.
… of the specimens was determined. A study of the wear mechanisms in the samples was performed. The Al micro- and nanoparticles as well as Ni microparticles are well dispersed throughout the material while Ag micro and nanoparticles tend to form agglomerates. Generally the presence of …
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Wear Mechanism/microstructure Relationships for Laser Processed Cast Iron (Erosion, Abrasion, Martensite, Transformation)
… in cast iron and (2) investigate the basic wear mechanisms of these non-equilibrium microstructures. Three kinds of microstructures can be produced by this laser processing. A very hard feathery microstructure ((TURN)100 HV), a "soft" dendritic microstructure ((TURN)550 HV) and a mixed …
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Reduction of friction in polymeric composites for artificial joint prostheses
… failure still occurs as the result of mechanical wear of the bearing surface. Several wear mechanisms have been proposed as the main causes for failure; however, none is as dominant as the delamination wear of artificial knee prostheses. Delamination wear occurs mainly as the result of cyclic …
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Evaluation and analysis of wear in progressive cavity pumps
… with optimised material selection, for both wearing parts, at a competitive price.Wear is not an intrinsic material property and its value is dependent upon the conditions within each individual tribological system. In order to improve or optimise the wear life of a system, it is first vital …
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An investigation of wear and the performance of steels in the gold mining industry
… as part of an endeavour to design an ideal wear resistant material for particular applications. The research was aimed at the alleviation of wear in the gold mining industry. In order to achieve this objective it was necessary to examine the surfaces of worn materials in order to gain a …
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Tribo-corrosion maps for steels, titanium and titanium carbide materials
… of change in sliding speeds and normal loads on wear behaviours were investigated for dry sliding conditions and tribo-corrosion maps were constructed with a tribo-system approach. The work was carried out in the following phases: In phase I, a fundamental study of the wear behaviour of two …
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Sustainable design of hydrocarbon refrigerants applied to the hermetic compressor
… from the physical test procedures to establish wear mechanisms and friction coefficients within the critical components. The tribological performance is used to predict deterioration in energy consumption and system durability. Results indicate that for higher contact stresses R600a MO charges …
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