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 91 for “"Wear rate"”.
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Zinc pot bearing material wear rate as a function of contact pressure and velocity
… objective of this project is to measure wear rate of submerged zinc-pot bearing materials as a function of contact pressure and velocity. A small laboratory size-testing machine was developed for this purpose. This machine measures the wear of bearing material samples, submerged in a cup …
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The sliding wear of polymers against steel
A laboratory wear testing facility has been developed to generate wear rate data for polymeric materials sliding at constant velocity against a hardened stainless steel base. The polymers investigated were ultra high molecular weight polyethylene (UHMWPE), ultra high molecular weight …
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The lubricating properties of graphite at elevated temperatures
The wear rate and the magnitude of friction of commercially available graphites in air have been shown to be dependent on the corrosion resistance of the graphite. In air the wear rate of graphite was observed to increase with increasing temperature up to 6000 C. A very rapid type of wear was found …
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Sliding wear of nitrided steels
The unlubricated sliding wear behaviour of gas nitrided, plasma nitrided, and ferritic nitrocarburized BS970,905M39 (EN41B) steels was investigated systematically from an engineering point of view. Commercial nitriding processes were employed, and the wear studies were carried out using a …
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A study of sliding wear behavior of heat treated 1060 steel with pure rolling pre-conditioning
Wear behavior of heat treated 1060 steel under sliding or pure rolling conditions have been studied well but how pure rolling affect wear behavior needs clearer relationship. Therefore, more investigation needs to be done in order to generate a complete relationship. Vacuum heat treated 1060 steel …
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The effects of rubber modification on friction and wear of epoxy networks
… enhance its fracture toughness. The friction and wear of specimens modified with different amounts of elastomer were investigated in a pin-on-disk wear machine. An attempt was made to correlate the fracture toughness of the epoxy material to its fatigue wear rate for experiments in which a steel …
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Evaluating abrasive wear resistance of extruder tooling materials using the dry sand rubber wheel abrasion test
… wheel abrasion test could be used as an accelerated test to evaluate candidate materials. Samples were tested in the heat treated condition and after surface modification by plasma ion nitriding. The range of materials tested included medium and high alloy steels and steel bonded carbide …
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The effects of the slip amplitude and lubricant type on the rate of false brinelling in roller bearings
False brinelling is a wear phenomenon that occurs in stationary rolling element bearings. Vibrations from adjacent running machinery are transmitted to the stationary bearing via the machinery foundations, and result in relative motion between the rollers and the races. This results in wear scars …
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The correlation of chemical structure to tribological properties of polyimide thin films
The friction and wear behavior of three thin polyimide films of known chemical structure was tested. An attempt was made to correlate differences in chemical structure, primarily the presence of flexible linkages and highly polar side groups, to differences in tribological properties. The wear test …
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Development of Comprehensive Experimental, Analytical and, Numerical Methods for Predicting Rubber Friction and Wear under Thermomechanical Conditions
… and the vehicle in general. Friction and tread wear are two of these contact characteristics. Considering the tire's functionality, for most applications, it is desired to have higher friction to have better traction and a lower wear rate to minimize the material loss of the tread. The friction …
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Friction material (metal reinforcement) analysis of brake pad for light rail train system
… and porosity test, shore hardness test and wear test were done in order to select which metal is the most suitable for railway application. Different composition were used, (Cu30%BaSO430%), (Cu25%BaSO435%), (Cu20%BaSO440%), (Steel30% BaSO430%), (Steel25% BaSO435%), (Steel20% BaSO440%), …
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Power plant degradation : a modular secondary plant and integral flow accelerated corrosion model
Flow Accelerated Corrosion (FAC) is the most prevalent material degradation mechanism for low carbon steel in steam-water flow systems. The band of uncertainty in predictions of wear rate due to FAC spans one to two orders of magnitude. Such a wide range of uncertainty inhibits the ability to …
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Effects of copper on wear and rolling-sliding contact fatigue of rail steels
The effects 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 …
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In situ control of lubricant properties for reduction of power cylinder friction through thermal barrier coating
… reversal along the engine cylinder liner. A strategy to reduce viscosity without increased metal-metal contact involves controlling the local viscosity away from top-ring-reversal locations. This paper discusses the implementation of insulation or thermal barrier coating (TBC) as a means of …
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Interactive influences of crosslinking, counterface roughness and kinematics on the wear of crosslinked UHMWPE
Ultra high molecular weight polyethylene (UHMWPE) wear debris has been shown to be a major cause of long term failure of total joint replacements. In vitro studies have shown that not only is the size and shape of the particles important for cellular response but also the volumetric concentration …
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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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Investigation on Physics-based Multi-scale Modeling of Contact, Friction, and Wear in Viscoelastic Materials with Application in Rubber Compounds
… tribological phenomena of contact, friction, and wear in viscoelastic materials with application in rubber compounds. Tribiological properties of rubber compounds are important for many applications such as tires, shoe heels and soles, wiper blades, artificial joints, O-ring seals, and so on. In …
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Energy and Thermodynamically Based Approaches for Analysis of Damage in Contact Problems
… studied, namely crack nucleation and adhesive wear. The proposed methodology is primarily based on the laws of energy and thermodynamics, and as such offers great advantages by unifying the analysis of damage in a variety of contact configurations. Crack nucleation is the first damage type …
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Tribological evaluation of unlubricated and marginally lubricated bearing materials
This thesis presents friction and wear rate measurements of the copper based bearing materials used in thrust bearing of aircraft fuel pumps. Highly detailed friction and wear data was collected from 20% and 30% lead in bronze (leaded bronze) substrates and 10% indium in lead (lead/indium) coated …
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