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 23 for “"Edge radius"”.
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Analytical and experimental study of the effect of cutting tool microgeometry on the impact resistance of milling tools
… the milling process, with respect to the cutting edge microgeometry. The first part of this thesis contains a mathematical model that was used to predict the cutting forces acting on the tool during milling, accounting for the edge radius. The second part reports the findings of a series of …
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Experimental Investigation of Shock-Shock Interactions over a 2-D Wedge at M = 6
The effects of fin-leading-edge radius and sweep angle on peak heating rates due to shock-shock interactions were investigated in the NASA Langley Research Center 20-inch Mach 6 Air Tunnel. The fin model leading edges, which represent cylindrical leading edges or struts on hypersonic vehicles, were …
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Effects of Duct Lip Shaping and Various Control Devices on the Hover and Forward Flight Performance of Ducted Fan UAVs
… were tested to determine the effects of leading edge radius of curvature and duct wall thickness. It was found that a lip with a small leading edge radius performed best in forward flight and crosswind conditions, while the performance of a lip with a large leading edge radius was enhanced in …
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Finite element modeling of cutting and burnishing processes at micro- and nanoscales
… there are various size effects, such as the edge radius, microstructure, and feature size effects. Second, the transition between these two processes based on the relative tool sharpness exists at the micro- and nanoscales. Third, the specific cutting energy changes nonlinearly as the uncut …
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Calibration of orifice plates with special emphasis on edge sharpness and eccentricity
… discharge coefficient of rounding the upstream edge of the orifice plate and of changes in plate eccentricity. Various methods to calibrate orifice plates and to measure the edge roundness of orifice plates are discussed. Orifice plates with area ratios ranging from 0,1.to 0,55 were tested in …
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Heat transfer modeling of jet vane Thrust Vector Control (TVC) Systems
… configurations studied, consisted of a simple wedge and a blunt bodied vane, with a leading edge radius of 1.016 mm (1/25 in.) These models were examined in a two dimensional, sonic and subsonic, cold flow field, for both laminar and turbulent flow cases. Results consist of a numerical solution …
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2D CFD Simulation of a Circulation Control Inlet Guide Vane
… jet that exhausts along the IGV's trailing edge surface. The IGV is designed for an axial inlet flow at a Mach number of 0.54 and an exit flow angle of 11 degrees. These conditions were selected to match the operating conditions of the 90% span section of the IGV of the TESCOM compressor rig …
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Development of temperature and feed rate controllers for a hybrid thermoplastic forming of surgical blades from bulk metallic glass
… ideal for the formation and retention of a sharp edge. At a high temperature above glass transition temperature, BMG transitions to a supercooled liquid regime, so that thermoplastic forming process can be applied. BMG has therefore been identified as an alternative material for precision surgical …
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An analytical investigation of the effect of blade profile variations on the erosion of coal-fired turbine blades
… Maximum erosion was found to be at the trailing edge of the stator and rotor and at the leading edge of the rotor. The trailing edge erosion of the stator and rotor was decreased as the blade exit angle was decreased. The trailing edge erosion of the stator and rotor was also decreased when the …
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Computational Fluid Dynamic Solutions of Optimized Heat Shields Designed for Earth Entry
… a power law reliance of convective heat flux on edge radius. A slender heat shield optimized for a single design point produces heat fluxes 1.8 times what was predicted using the Newtonian approach. Here, maximum heating decreases with the inverse cube of the base sharpness. Coupled …
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Thermal-Fluid Dynamic Model of Luge Steels
… to the melting temperature. A sharper steel edge radius was found to be beneficial in lowering the coefficient of friction at lower sled velocities. The sharp edge radius friction benefit decreases as the sled speed increases and is predicted to actually increase friction slightly compared to …
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A numerical study of the response of blast loaded thin circular plates, with both clamped and integral boundary conditions
… of fillet radii at the integral boundary, and an edge radius at the clamped boundary, have been reported in additional experiments. These modifications are also modelled in the current investigation. The finite element model incorporates non-linear geometry and material effects, and strain rate …
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Experimental studies in a supersonic through-flow fan blade cascade
… off-design conditions. Analysis of the leading edge shock shows that the leading edge radius is a major source of losses in STFF blades. Losses from the leading edge bluntness are convected downstream into the blade wake, and are difficult to distinguish from viscous losses. Shock losses are …
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Tooling performance in micro milling: Modelling, simulation and experimental study
… the conventional milling, however, existing knowledge and experiences are limited and comprehensive studies on the micro tooling performance are essential and much needed particularly for the process planning and optimization. The cutting performance of micro tools is largely dependent on the …
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Development of meso-scale flexible cutting tool for micro-groove cutting in steel
… damage governing laws and different cutting edge geometries. Various inherent process mechanics including the stress and strain distribution, chip formation and development, cutting force predictions, side burr formation, and temperature distributions at the size scale involved were studied. …
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A finite element study of the mechanics of micro-groove machining of 4340 steel
… also noticed that the cutting tool with a small edge radius and a larger rake angle experienced lower temperature, lower stresses, and smaller cutting forces on its rake face.
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Development of a hybrid thermoplastic forming process for the manufacture of multi-facet and curvilinear surgical blades from bulk metallic glass
… ideal for the formation and retention of a sharp edge. At high temperatures above the glass transition temperature, BMG begins to exhibit softening behavior and transitions to a supercooled liquid regime. This supercooled state allows the use of economically-viable thermoplastic forming techniques …
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Development of a hybrid process for manufacturing surgical-grade knife blade cutting edges from bulk metallic glass
… producing BMG surgical-grade knife blade cutting edges with edge radii <25 nm. A hybrid process testbed was designed and used to successfully run tests over a range of the key process variables. Three distinct deformation types were observed and were dependent on the balance between necking and …
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Optimisation of variable helix end milling tools
… for tools with different rake and relief angle, edge radius and variable helix/pitch. It was found that variable helix/pitch had the greatest influence on the process damping phenomenon.
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Development of high energy density dielectrics for pulse power applications
… 1.03, and 1.23 for the planar, dimpled, and edge radius electrode designs, respectively. Field modeling showed resistive gradients induced by donor doping TiO<sub>2</sub> with Nb<sup>+5</sup> would mitigate these field enhancements. Therefore, diffusion of Nb<sup>+5</sup> was studied as a …
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