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 30 for “"thermal fatigue"”.
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THERMAL FATIGUE DAMAGE OF ASPHALT PAVEMENT
Fatigue damage can be defined by a decrease in stiffness of Asphalt Concrete (AC) under repeated traffic loading. For each cycle of traffic loading, tensile strain develops at the bottom of AC layer of an asphalt pavement. Some localized damages occur in the material at minute-scale due to this …
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Thermal fatigue of solder joints in micro-electronic devices
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1986.
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Thermal fatigue oxidation and SO₂ corrosion of an aluminide-coated superalloy
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1986.
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Self-sealing of thermal fatigue and mechanical damage in fiber-reinforced composite materials
… for aerospace applications. The inherent thermal fatigue of these vessels leads to the formation of microcracks, which allow gas phase leakage across the tank walls. In this dissertation, self-healing functionality is imparted to a structural composite to effectively seal microcracks …
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Pre-diffusion to improve the thermal fatigue strength of overlay coatings on nickel-base superalloys
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Mechanical Engineering, 1989.
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Integrated process and control modelling of water recirculation in once-through boilers during low load and transient operation
… without adequate consideration of the potential thermal fatigue damage on the economiser, evaporator and superheater components and the risk of turbine quenching incidents. The purpose of this study was to develop an integrated process and control model that can be used to study transient events. …
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Transient boiler heat exchanger thermal behaviour analysis
… aging. The main aging mechanisms are creep and thermal fatigue. Creep results from the high temperatures at which the components operate. Thermal fatigue is due to thermal stresses and these stresses result from temperature gradients within the material. Cycling of these thermal stresses …
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An investigation into tool-wear and phenomena influencing tool-life in milling
… of the equations which result tend to support a thermal fatigue process as the most likely source of difference between continuous and discontinuous cutting. To validate this hypothesis further, special tests have been conducted within an inert atmosphere to ascertain the influence of oxidation …
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Assessment of Hybrid CFD Turbulence Model, STRUCT-epsilon, for Thermal Striping Behavior
… nuclear reactor designs are susceptible to thermal fatigue damage caused by thermal striping, which presently accepted modeling and design tools are unable to accurately or reliably predict the presence of. Advanced reactors are vital in achieving net-zero carbon electricity production and …
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Microstructural Evolution in Thermally Cycled Large-Area Lead and Lead-Free Solder Joints
… describe the stresses accumulated due to thermal fatigue as a result of CTE mismatch within the system. By understanding the failure mechanisms related to lead-free solders, the application of lead- free solders could be more strategically designed for specific applications. The objective …
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Microstructure Characterization of SUS444 Ferritic Stainless Steel
… for a thin exhaust manifold must tolerate cyclic thermal fatigue. In SUS 444, this characteristic is directly related to the influence of microstructure on high temperature strength and the stability of the microstructure at the high operating temperature range. The goal of this research is to …
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Characterization Study of Plasma Spray Attachment of Intrinsic Fabry-Perot Interferometric Sensors in Power Generation Applications
… The material properties of the deposits and the thermal stresses in the system were evaluated to determine attachment lifetime of the sensors. The encapsulated sensors' signals were collected before and after plasma spraying and at elevated temperatures. The material properties of the deposits …
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Study of the properties of cemented carbides from industrial production
… since a few data are available in literature, Thermal Fatigue and oxidation damage in WC-Co were studied. The main results of this PhD thesis show that the hardness and fracture toughness of WC-Co are defined by the mean binder free path and not by the contiguity since the high standard …
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Design of unique composites based on aromatic thermosetting copolyesters
… are much lower than that in epoxy/C composites. Thermal fatigue testing suggests that ATSP shows better resistance to microcracking compared to epoxy resins.
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Micro and nanostructures for two-phase fluid and thermal transport
… two-phase heat sinks with reduced mechanical and thermal fatigue. The insights gained from these works lead to new design principles for advanced thermal management solutions for high power density electronic systems in the future.
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Laser surface modification of steel
… micro- Vickers diamond indentation. A customized thermal fatigue system was used to investigate the effect of surface roughness on the modified surface fatigue properties. A modified surface grain with an ultrafine size of less than 500 nm was observed to be achievable. A modified surface depth …
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Fracture Resistance of Coated Polycrystalline Silicon Wafers
… polycrystalline silicon wafers under cyclic thermal and mechanical loadings. Mainly experimental studies were conducted on the failure of raw and polished wafers, uncoated and coated with nano-sized Si3N4 coatings. The wafers were mechanically characterised. The coating material was also …
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A Structure-based Machine Learning Approach for Spatiotemporal Fluctuations in Nuclear Thermal Fluids
… and mixing of different temperature flows drives thermal-induced mechanical failures. Thermal striping is a such phenomenon characterized by the turbulent mixing of non-isothermal streams, which can induce thermal stress fluctuations and fatigue damage in the critical components. The concern over …
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Thermal and Thermo-Mechanical Analyses of Wire Bond vs. Three-dimensionally Packaged Power Electronics Modules
… have not yet been fully understood in terms of thermal and thermo-mechanical performance. Therefore, a comparative evaluation between the thermally induced response in conventional wire bonding (a 2-Dimensional technology) and 3-Dimensional packaging technologies is essential. Thermal and …
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