Global ETD Search
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 14 of 14 for “"surface wear"”.
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Near surface wear structure of ceramic components
… used to determine the strain profile in the near surface regions of a flat and a rough fully stabilized zirconia samples. The results show that a compressive zone is present in the near surface region of each sample. A partially stabilized zirconia disk was examined using symmetrical and …
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Surface mechanics of polyacrylamide hydrogels following wear
… the changes in elasticity of synthetic hydrogel surfaces following deliberate abrasive surface wear are measured. These polyacrylamide hydrogels – cross-linked polymers consisting of 92% water by mass – undergo surface wear, and their surface elastic properties before and after wear are measured. …
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Investigating DC circuit breaker service life
… large transient voltages that accelerate switch wear and reduce service life. A low-cost low-complexity RC circuit was designed using fundamental component equations and implemented in Simulink and in hardware revealing effective voltage spike reduction. Simulation predicted spike reduction from …
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The role of metal ions in metal-on-metal total hip replacement
… offered theoretical advantages of decreased wear and increased functional outcomes. MoM bearings have been associated with sterile inflammatory masses and significant soft tissue destruction with poorer outcomes following revision surgery. The natural history of adverse reactions to metal …
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A COMPUTATIONAL APPROACH TO FRETTING WEAR PREDICTION IN TOTAL HIP REPLACEMENTS
… of contact geometry for a given application. “Wear” is one of a number of mechanical failures that can occur in mechanical coupling design. “Fretting wear” occurs where surfaces in contact are subjected to oscillating load and very small relative motion over a period of time. Fretting has been …
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Multi Scale Contact Mechanics of Bio-Mechanical Systems with inclusion of roughness effect- Fractal Analysis
Contact mechanics of rough surfaces and surface wear will be considered. Two types of failures are considered. The first involving rapidly growing failure and the second fatigue type surface failure as a result of repetitive application of load cycle. The first type of failure will be identified …
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Wear modeling with sensitivity to lubricant chemistry
… by the ability of its components to resist wear. Zinc dialkyl-dithiophosphate (ZDDP) is an engine oil additive that reduces wear in an engine by forming solid antiwear films at points of moving contact. The effects of this additive are fairly well understood, but there is little theory …
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Effects of select fluids on the friction of metal-on-polyethylene joint replacement surfaces
… the tribology of total joint arthroplasty (TJA) surfaces, which are primarily comprised of a polished metallic or ceramic component articulating on an Ultra-High Molecular Weight Polyethylene (PE) surface. Wear particles released from the PE surface are the primary cause of TJA failure. The human …
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Predicting Motion of Engine-Ingested Particles Using Deep Neural Networks
… of ice particle ingestion can range from surface-wear abrasion to engine power loss. It is known that sufficiently small particles, characterized by small particle response times (τp), closely follow the fluid trajectory whereas large particles deviate from the streamlines. Rather than …
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Comparing Wear of the Osteoarthritic Temporomandibular Joint and Distal Interphalangeal Joint: A Cadaveric Study
… to determine whether OA severity and spatial wear patterns are concordant across joints with distinct biomechanics and ossification processes by comparing the temporomandibular joint (TMJ) and the distal interphalangeal joint (DIPJ). While most OA studies rely on imaging, cadaveric dissection …
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The use of Lethabo field 2 PFA in pavement quality concrete
… has to be durable to withstand the load and wear imposed by vehicles moving across it and the effects of drying shrinkage and thermal changes. Failure of the pavement by either excessive cracking or degradation of the surface results in poor riding quality and low skid resistance. The …
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Freight transport modal choice in North West England's Atlantic Gateway
… levels of congestion, elevated levels of road surface wear and tear and an increase in transport related air pollution. When taken in combination with the failure of attempts to balance modal split the road network’s continuing slide towards breaking point seems to be beyond question. However, …
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Development of Protocols and Methods for Predicting the Remaining Economic Life of Wastewater Pipe Infrastructure Assets
… the performance regarding; integrity, corrosion, surface wear, joint, lining, blockage, IandI, root intrusion, and capacity. These performance indices are used for the long-term prediction of performance. However, due to limitations in historical performance data, an advanced integrated method for …
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Tření a mazání biomateriálů s modifikací povrchu pro kloubní implantáty
Povrchové úpravy biomateriálů, jako jsou DLC povlaky a mikrotexturování, mohou výrazně prodloužit životnost kloubních náhrad díky zlepšení jejich tribologických vlastností. Mechanické opotřebení třecích ploch je hlavní příčinou selhání implantátů, a proto kombinace vhodných materiálů a povrchových …