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 7 of 7 for “"large thermal gradients"”.
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A thermally-driven design methodology for large-scale polymer additive manufacturing systems
… Inter-layer welding is of special concern in large-scale extrusion processes, as the large thermal gradients induce residual stresses that can overcome weak inter-layer welds, causing warping and cracking [2].
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Modeling the Behavior of a Type-319 Aluminum Alloy During Quenching
… involves a severe quench that can cause large thermal gradients, leading to undesirable residual stresses and strains. The ability to predict accurately residual stress and strain development during the quench would allow the design of aluminum engine parts with increased fatigue …
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The thermomigration of Au195 and Sb125 in gold and Ni59 in nickel
The effect of large thermal gradients on the mass transport of Au195 and Sb 125 in gold and Ni59 in nickel has been investigated. Specimens in the form of rods containing two welded interfaces separated by l/8-inch were fabricated. Each interface contained a layer of the appropriate tracer an an …
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Total Temperature Probe Performance for Subsonic Flows using Mixed Fidelity Modeling
… the sensor, fluid and the surroundings due to large thermal gradients present in real turbomachinery systems. While these effects have been previously investigated, the available design models are very limited to specific geometries and flow conditions. In this Dissertation, a more fundamental …
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Engineered interfaces controlling the nucleation and flowability of complex fluids
… them. By monitoring the motion of bubbles under large thermal gradients, we demonstrate how the liquid-vapor surface tension of a binary mixture of alkanes differ substantially from the corresponding property of its constituents. Furthermore, we show how the liquid-vapor surface tension of these …
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Thermal regulation of vascularized fiber-reinforced polymer matrix composites
… cracking, creep, mass loss, and even thermal degradation at elevated temperatures. Furthermore, most polymer matrices are flammable and combustion may occur if temperatures rise high enough. Maximum service temperature is typically set by glass transition temperature (Tg) and for …
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Physics Based Modeling and Characterization of Filament Extrusion Additive Manufacturing
… but presents significant challenges in terms of large thermal gradients and challenging AM machine requirements. Through this analysis, it was discovered that convective cooling dominated the heat transfer (on the desktop FFF scale) producing a significant cross-sectional temperature gradient, …