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Showing 1 to 20 of 31 for “"RCF"”.
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Analytical and experimental investigation of microstructural alterations in bearing steel in rolling contact fatigue
<p>Rolling Contact Fatigue (RCF) is one the most common failure modes in bearings. RCF is usually associated with particular microstructural alterations. Such alterations (i.e. white etching cracks, butterflies, etc.) which lead to RCF failure are known to be among the most concerning matters to …
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Nonlinear Truss Analysis of Non-ductile Reinforced Concrete Frames with Unreinforced Masonry Infills
Non-ductile Reinforced Concrete Frames (RCF) with and without Unreinforced Masonry (URM) infills can be found in many places around the world including the Western United States, Eastern Europe, Asia and Latin America. These structures can have an unsatisfactory seismic performance which may even …
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Resistive Companion Dynamic Phasor Networks and Phasor to Time Domain Network Coupling
<p>The resistive companion form (RCF) is extended to phasor and dynamic phasor models. A phasor solver is implemented in the Virtual Test Bed (VTB) simulation environment. Several models targeting the VTB phasor solver are derived and discussed.</p> <p>Also, a method for coupling phasor RCF …
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Catalytic Upgrading of Lignin From Biomass
… upgrading. Reductive Catalytic Fractionation (RCF) is a promising “lignin-first” biomass upgrading technique that extracts and depolymerizes lignin while preserving the polysaccharides as a solid residue. Using a custom-built flow-through reactor, we determined the mechanisms under which the …
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Finite Element Modelling of Deep Zone Residual Stresses in Rolling Contact Bearing Elements.
… are subjected to rolling contact fatigue (RCF) resulting in bearing material evolution and development of residual stresses under the contact track with progressive stress cycles. The evolved bearing material contains different microstructural features, termed as dark etching regions (DERs) …
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Three-dimensional boundary element and experimental analysis of lubricant ceramic surface ring cracks in rolling contact.
… in predicting rolling contact fatigue (RCF) life. The influence of the lubricant, contact pressure and crack geometry on the RCF mechanism is difficult to determine due to the variable nature of RCF life when the crack location is not defined. In this study, rolling contact fatigue was …
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Applying Reference Class Forecasting to Multifamily Investments: Identifying and Capturing Operational Alpha through the Outside View
This thesis applies Reference Class Forecasting (RCF) to multifamily real estate underwriting as a means of countering optimism bias, strategic misrepresentation, and other distortions embedded in the traditional “inside view.” Adapted from its proven application in infrastructure and corporate …
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Development Of Second Generation Rolling Contact Fatigue Tester
… and Dr. Marcellin Zahui. The first generation RCF tester was used for testing super finishing processes for gear surfaces. The second generation RCF tester was funded by the Advanced Engineering Materials lab of University of North Dakota. </p> <p> Verification of the second generation Rolling …
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Rolling contact fatigue of silicon nitride.
… Three types of surface with coarse, fine and RCF-conventional finishing conditions were examined. Flexure strength tests on half-rod and C-Sphere showed an increasing surface strength from specimens with coarse, fine to RCF-conventionally machined conditions. During rolling contact fatigue …
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Synergistic coordination of oxygen functional groups with catalyst surface promotes hydrogenolysis of lignin model compounds
… of reductive catalytic fractionation (RCF) a lignin-first approach to lignin extraction and depolymerization. While this technology is promising, little is understood about the fundamental chemistry of the process. This work aims to provide insight into the kinetics and mechanisms of …
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Microstructural alterations in bearing steels under rolling contact fatigue
… in bearing steels under rolling contact fatigue (RCF) is systematically studied. A literature review summarizes current understanding in this field, leading to the key to the formation of these microstructural features being carbon redistribution as a consequence of cyclic rolling contact. In this …
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Ion dosimetry for radiobiology experiments employing laser-accelerated beams
… in ionization experiments is radiochromic film (RCF), as it provides an optical density response proportional to dose. However, it has been found by numerous research groups that this response to dose is different for particles of different types and energies, which is thought to be linked to …
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Numerical and experimental investigation of Nylon66 (PA66) reinforced recycled carbon fiber composites and aluminum foam for application in vehicle crashworthiness and occupant protection per various FMVSS regulations
… Nylon66 reinforced recycled carbon fiber (PA66 RCF), and aluminum metal foam, for crashworthiness applications. To achieve this goal, it is essential to have a library of mechanical properties with materials of interest. Firstly, the coupon level tests such as tensile, three-point bending, and …
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Development Of A Slide-Rolling Contact Fatigue Tester
… of a sliding-rolling contact fatigue (S-RCF) test rig. A majority of the development and fabrication was performed by a group of students at the University of North Dakota before May 2007. After this, completion of the tester was finished by the graduate student of this thesis. Unlike …
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Reactor physics assessment of thick silicon carbide clad PWR fuels
… annular fuel with "thick" SiC (Thick SiC RCF), and Thick SiC with solid PuO2/ThO2 pellets. CASMO-4E and SIMULATE-3 have been utilized to model the above in a 193 assembly, 4-loop Westinghouse pressurized water reactor (PWR). A new program, CSpy, has been written to use CASMO/SIMULATE to …
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Effects of copper on wear and rolling-sliding contact fatigue of rail steels
… 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 for the study. All …
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Análises fractal e histopatológicas da placenta humana de feto com restrição de crescimento
… grupos: Grupo Restrição de crescimento fetal (RCF) e Grupo Controle. Foram realizadas análise dos dados clínicos das gestantes e análise histopatológica, morfométrica, imunohistoquímica e fractal das 15 placentas coletadas. Os resultados indicaram presença de vilosidades avasculares, …
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Multiscale Modeling of Fatigue and Fracture in Polycrystalline Metals, 3D Printed Metals, and Bio-inspired Materials
… hierarchical materials. Rolling contact fatigue (RCF) is a major source of failure and a dominant cause of maintenance and replacements in many railways around the world. The highly-localized stress in a relatively small contact area at the wheel-rail interface promotes micro-crack initiation and …
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Proton acceleration experiment by high intensity laser pulse interaction with solid density target at the Texas Petawatt Laser Facility
… is still unfinished, a brief result with RCF image will be introduced in chapter 6.
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Schemes of ion acceleration employing high energy, petawatt laser pulses
… parabola spectrometers (TPS), radiochromic film (RCF), and time-of-flight (ToF) detectors. Energies approaching 60MeV are recorded in RCF stacks, and over 50MeV in the TPS, with an average energy comparable to what is achieved with 9μm plastic foils, also irradiated in this campaign for …
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