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 20 of 34 for “"sliding contact"”.
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Sliding contact at plastically graded surfaces and applications to surface design
… surface damage during normal indentation and sliding contact. These graded materials have potential applications in diverse areas such as barrier coatings for structural components and industrial tools. The gradient in plastic properties is of greater significance for such tribological …
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Thermal analysis of sliding contact systems using the boundary element method
… rise caused by frictional heating between sliding solids. The theoretical model consists of two semi-infinite substrates each coated with a film of arbitrary thickness and thermal properties. A three dimensional transient analysis is developed which involves the thermal coupling of the two …
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Effects of copper on wear and rolling-sliding contact fatigue of rail steels
… of copper content on the wear and rolling contact fatigue (RCF), specifically rolling sliding contact fatigue (RSCF), of hypereutectoid rail steels were evaluated. Steel from three heats of head hardened, hypereutectoid rails with copper levels of 0.07, 0.38, and 0.85 wt pct were selected …
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Development of nano composite coatings for enhanced performance in non-conventional lubricants under sliding contact.
… has been performed on uncoated steel contacts to assess friction and wear performance of HFE-7000 (HFE-347mcc3). HFE-7000 has been employed as lubricants. In the second part of this study five different types of coatings namely, Ni-Al2O3, Ni-ZrO2, Ni-SiC, Ni-Graphene and Nickel-only …
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Design and fabrication of a twin disc tribometer and a study of wear and friction of hardened 1060 steel under combined rolling and sliding
… of steel was studied under different loading and sliding conditions. A twin-disc tribometer was designed and built for studying wear of steels under combined rolling and sliding contact. The samples were made from 1060 steel in the form of circular discs and heat treatment was performed to attain …
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The wear behaviour of UHMWPE and ion implanted UHMWPE against differing counterfaces
… UHMWPE during water lubricated reciprocating sliding against differing stainless steel and Yttria Partially Stabilised Zirconia (YPSZ) counterfaces. A new laboratory test apparatus was designed, built and commissioned to facilitate this research. The new apparatus is capable of simulating the …
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Friction, wear and lubrication of a poly(2-hydroxyethyl methacrylate) hydrogel
… material crosslink density. Linear oscillating sliding contact tests were performed on each polyHEMA disc for approximately 30 minutes per test. Friction coefficients found ranged from 0.05 to 1.7. Linear wear measured ranged from 0.02 mm to 1.32 mm.
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Infrared radiometric measurements of surface temperatures generated by friction of sliding iron-on-sapphire
… of surface temperatures produced during dry sliding contact were made by using an advanced infrared microscope which receives radiation from a very small target area e.g., 1.78 x 10⁻⁵m in diameter for a 36X objective, allowing temperature measurements within a general region of contact. The …
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Micro-scale scratching by soft pad asperities in chemical-mechanical polishing
… surface of the pad, only the tall asperities contact the wafer and transmit the necessary down force and motion to the abrasive particles for material removal. As the applied pressure is concentrated under few asperities, however, the asperities themselves, even though softer, may generate …
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Micro and nano mechanics of materials response during instrumented frictional sliding
… investigated quantitative aspects of frictional sliding contact in the elasto-plastic regime. In this thesis, a new framework was developed to establish relationships between the frictional sliding response, material properties and contact parameters. Dimensional analysis enabled to define …
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Theoretical study of heat distribution and surface temperatures generated in oscillating contact
… temperature rise for simple systems with sliding contact. The solution method developed is a variation of the boundary integral equation method (BIEM) in which a moving, full-space Green's function is used as the fundamental solution. The numerical characteristics and limitations for the …
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Infrared microscope studies of surface temperatures produced by friction with graphite-epoxy and carbon-PEEK composites
… 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. Surface temperatures on the order of 100-160°C were measured at …
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Collision Analysis of the Reversible Crankshaft Mechanism in a Convertible Refrigeration Compressor
… a method has been developed to model rotary sliding contact between two cylindrical surfaces. This method is developed and investigated in hopes that it will facilitate the modeling of the behavior of the compressor linkage in a dynamic finite element analysis.
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Triboemission From Ceramics: Charge Intensity and Energy Distribution Characterizations
… of charged-particles triboemitted from sliding contacts of ceramics. A review is presented of research work on tribochemistry and, in particular, on tribopolymerization as a lubrication mechanism. Relevant literature is also reviewed on the phenomena of exoemission, triboemission and …
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Finite element analysis of combined fracture and delamination on coated substrate under normal and tangential loading
… and thermal failure. Coating is subjected to contact loading of normal and tangential loading, originated from contact pressure and sliding contact. In this thesis, aeroengine brittle material has been modelled to simulate coating failure under combined fracture and delamination failure. Hard …
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The Mechanisms of wear of the video head
… wear occuring to manganese-zinc ferrite heads in sliding contact with iron oxide media. A literature survey is presented, which covers magnetic recording technologies, focussing on video recording. Existing work on wear of magnetic heads is also examined, and gaps in the theoretical account of …
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Fundamental and applied aspects of contact electrification
… of electrification produced by rolling or sliding contact between a spherical specimen, and a plane dielectric sample. Measurements of the charge transferred to metal contact spheres, and the two-dimensional dielectric surface charge distribution, have been carried out under controlled …
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Micro Surface Texturing for Friction Control
… This dissertation demonstrates that under dry sliding, there is a specific significant surface texturing parameter at which the coefficient of friction should be at a minimum. This dissertation met this objective through an extensive study of the relevant literature on surface texturing and …
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Theoretical analysis and experimental investigation of contact fatigue and surface damage in prealloyed and diffusion bonded sintered steels
The contact fatigue and surface damage of prealloyed (Fe-0.85Mo, Fe-1.5Mo) and diffusion bonded (Ni-free, low-Ni, high-Ni) powder metallurgy (PM) steels were investigated. Materials subjected to contact stress fail due to the nucleation of subsurface cracks (contact fatigue cracks), nucleation of …
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