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 69 for “"material degradation"”.
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Material Degradation Studies in Molten Halide Salts
… slow-down the corrosion process, and enhance the material properties, selected alloys were boronized and tested for their compatibility in the molten KCl-MgCl2-NaCl salt. The borided alloys exhibited better resistance to molten salt attack, where the boride layer in the exposed alloy was still …
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Modeling Material Degradation Due to Moisture and Temperature
… serviceability, and load bearing capacity of materials and structural components can be adversely affected due to external stimuli, which include exposure to a corrosive chemical species, high temperatures, temperature fluctuations (i.e., freezing-thawing), cyclic mechanical loading, just to …
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Heat flow and material degradation during laser metal forming
… Dept. of Ocean Engineering and Dept. of Materials Science and Engineering, 1985.
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Urban stormwater runoff contamination associated with gutter and pipe material degradation
… to typical stormwater pollutant sources (erosion materials, automotive activity, landscaping chemicals, pet wastes, etc.), urban stormwater runoff can also be contaminated with substances that leach from materials with which the water contacts as the rain water travels through an urban area to the …
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Magnetic hysteretic characterization of ferromagnetic materials with objectives towards non-destructive evaluation of material degradation
Structurele componenten en machineonderdelen vervaardigd uit staal worden vaak onder veeleisende omstandigheden uitgebaat. Dit kan aanleiding geven tot materiaaldegradatieprocessen zoals verbrossing en metaalvermoeiing. Mettertijd kunnen deze microstructurele processen leiden tot een graduele …
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Development of a ferroelectric plasma source through material degradation studies and characterization of volume and surface discharges
… particle emitter is partially limited by the materials used. A particular case of this is a ferroelectric plasma source (FPS) or ferroelectric electron emitter (FEE), in which a strongly polarizable material, capable of generating large surface currents (10^0 – 10^5 A/cm2), is pulsed to emit …
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Metallographic study of gamma - gamma prime structure in the Ni-based superalloy GTD111
The potential for land-based turbine buckets material rejuvenation presents a significant commercial and scientific interest. Ni-based superalloy GTD111 is used at a number of GE-manufactured power generation turbines. The outstanding creep resistance features of Ni-based superalloys can be …
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Influence of temper condition on the nonlinear stress-strain behavior of boron-aluminum
… the cyclic tests show that the linear range of material behavior was increased by cyclic loading to a maximum value for all laminates and temper conditions. Typically, a maximum linear range was established which remained constant except in those cases where material degradation was indicated. …
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Performance Review of Pipe to Structure Connections In Storm Water Infrastructure
… signs of leakage or infiltration, cracking, material degradation, and grout coverage.</p> <p>Results showed that many resilient connectors remained visible and generally intact, although a substantial number of expected resilient connector locations were partially grouted over. Traditional …
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Development of a CubeSat Instrument for Microgravity Particle Damper Performance Analysis
… mechanisms. However, temperature sensitivity and material degradation limit the effectiveness of traditional damping techniques in space. Robust particle damping technology offers a potential solution, driving the need for microgravity characterization. A 1U cubesat satellite presents a low cost, …
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The effect of chemical treatment, fibre length, fibre content and injection moulding parameters to uv irradiation resistance of oil palm fibre reinforced composites
… are many types of polymer used in engineering materials expose to UV irradiation, such as automotive parts (car body, bumper, dashboard etc.) which can cause material degradation. Some polymers are used in pure polymer and some of them in composite material. This study has investigated the …
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Single-Chamber solid oxide fuel cells: modelling and experiments
… and cathode morphology (its micro-structure and material) are important factors to consider. Other parameters such as, flow rate, temperature and mixing ratio are also very effective in improving the cell performance but these parameters should be carefully controlled in order to avoid their …
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Nanoscale optoelectronic properties in traditional and emerging materials for light-emitting diodes
… efficiency droop at high current densities and material quality degradation at longer emission wavelengths. Establishing rational process design principles to address such issues remains inhibited by ongoing controversy surrounding the impact of commonly observed defects such as well-width …
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Modeling of textile based composite materials
… failure response of textile based composite materials has been developed and implemented. The geometrically thorough textile geometry model is used as the basis for creation of the geometry used for the finite element analysis. A detailed assessment is made for the linear elastic response of …
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Thermal Degradation of PC and PA6 During Laser Transmission Welding (LTW)
… weld strength of LTW starts to decline due to material thermal degradation. Thermal degradation of materials is a kinetic phenomenon which depends on both temperature and time. Therefore there is no specific temperature for thermal degradation. Thermal gravimetric analysis (TGA) is used to …
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Characterising Nanostructure and Understanding its Influence on Phase Stability and Performance in Halide Perovskites
… properties in beam-sensitive halide perovskite materials. Utilising Scanning Electron Diffraction, I first show that deep trap states in perovskite materials are strongly correlated with the presence of phase impurities on nm length scales. I then show that these very phase impurities, which are …
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A quantified approach to the functional longevity of Geosynthetic Rolled Erosion Control Products (GRECPS)
… A standard approach is needed to quantify this material degradation over time. Through this analysis, the degradation of the GRECP’s durability and coverage is predicted over time, field validated, and compared to their respective functional thresholds. The time at which the GRECP’s durability …
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Stress evolution of thin film RuO₂ Li-ion battery electrodes
… battery development is high volume expansion and material degradation in electrodes with high theoretical Li ion capacities. Among these materials is RuO₂, which exhibits excellent capacity and great potential for use as either cathode or anode in low power electronics. In order to better …
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Experimental and modelling studies of pit-to-crack transition under corrosion fatigue conditions
Corrosion fatigue cracking is a material degradation mechanism which occurs when materials are under cyclic loading and in a corrosive environment. The joint effect of both mechanical and environmental factors makes it one of the most challenging topics in the study of material degradation. The …
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