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 15 of 15 for “"Strengthening Mechanism"”.
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Wellbore Strengthening by Means of Nanoparticle-Based Drilling Fluids
Wellbore strengthening is the mechanism of increasing the fracture pressure of the rock at depth. Application of wellbore strengthening in the drilling industry enable safe drilling by preventing mud losses, drilling in narrow mud windows, accessing reserves in depleted reservoirs, and also has the …
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Mechanism-based constitutive modeling of L1₂ single-crystal plasticity
… in nickel-based superalloys and is a major strengthening mechanism contributing to the superalloys' outstanding high-temperature mechanical properties. Many L12-structure crystals present unusual macroscopic mechanical properties, including the anomalous temperature-dependence of yield …
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The effects of irradiation on the creep and hardening behavior of crystalline and amorphous materials
… distribution, morphology on hardening mechanisms. 1) During room temperature irradiation, a nanograin solid-solution strengthening mechanism with a linear compositional dependence is observed for the as-grown alloys and for the alloy samples irradiated to 0.5 dpa. Solid solution …
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Characterization and Mechanical Properties of Nanoscale Precipitates in Modified Al-Si-Cu Alloys Using Transmission Electron Microscopy and 3D Atom Probe Tomography.
… to understand the precipitation behavior and strengthening mechanism. In this study, the mechanical properties and microstructure were investigated using transmission electron microscopy and three dimensional atom probe tomography. The Mn and Mg effects on the microstructure and mechanical …
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Strategic interactions in modern elections and markets
… (RCV), large-scale empirical validation of RCV's mechanism design, and AI-driven strategic behavior in oligopolistic markets. My overarching aim is to identify strategic gaps and guide institutional design in technology-mediated environments, which I do by developing theoretical and algorithmic …
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Effects of filtration process variables on filter cake properties and formation
… reason, these techniques are known as wellbore strengthening. These techniques rely on using large particles which cause practical issues. Therefore, developing a wellbore strengthening mechanism that does not rely on adding large particles into the drilling fluid is needed. An alternative …
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Geotechnical performance using alkaline activated fly ash for soil mixtures with and without polypropylene fibers
… recently to stabilize soft soils. Though it’s strengthening mechanism and final product in terms of stiffness and brittleness resembles that observed by cemented soils. In other words, the residual strength emerged when approaching failure is very low resulting in immediate damage of building …
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Powder/Sol-enhanced Au–Ni Electroplated Composite Coatings: Structures, Properties and Mechanisms
… of the coatings were studied, and the underlying strengthening mechanism was investigated. The color, reflection, electrical resistivity and corrosion resistance of the improved coatings were also investigated in the research. It was found that the addition of solid particle or sol has no …
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Production of strengthened copper materials by Mechanical Milling-Mechanical Alloying and Spark Plasma Sintering
… Work hardening has been proposed as a successful strengthening mechanism for the production of harder copper material, keeping the intrinsic conductivities. In this PhD thesis initially mechanical milling (MM) has been considered as suited strengthening technique due to the severe strain hardening …
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Microstructural Evolution in Refractory Metal Multi-Component Alloy Systems
… assessed to promote controlled precipitation for strengthening. V and Ti were selected as strong carbide formers with comparatively low density among the refractory elements. Furthermore, Ti also presents a potential secondary strengthening mechanism through Laves-phase formation when realised as …
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Strength modelling of Al-Cu-Mg Type alloys
… of various contributions from precipitation strengthening, solution strengthening and dislocation strengthening are modelled. Strengthening by Cu-Mg co-clusters and S phase is described by the modulus strengthening mechanism and the Orowan bypassing mechanism, respectively. The predicted …
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Advanced characterizations of austenitic oxide dispersion-strengthened (ODS) steels for high-temperature reactor applications
… it is important to understand the fundamental mechanisms of the enhancement of ODS steels in mechanical properties. In this dissertation, a series of austenitic ODS stainless steels were investigated by coordinated state-of-the-art techniques. A series of different precipitate phases, including …
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Mechanical properties and influences of irradiation in dilute nanograined aluminum alloys
… layer. The first part of this work concerns the strengthening mechanisms operating in nc-Al alloys which are promising materials for nuclear power plant application. Microstructure and mechanical characterizations under various annealing temperatures were performed. The results suggest that …
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Mechanical property of body-thoroughly enhanced austenitic stainless steel and high-Mn steel by industry-applicable 3-axis stress-released impact
… annealing treatment in the SS contributes extra strengthening effects. The great ductilities of the austenitic steels are attributed to the high volume of twins produced by this novel process. The high-Mn steel experiencing the uniaxial impact plus annealing treatment displays severe PLC effect. …
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Elevated temperature mechanical properties of line pipe steels
… three X70 steels. DSA was verified as an active strengthening mechanism at elevated temperatures for all line pipe steels tested resulting in serrated yielding, a minimum in ductility as a function of temperature, a maximum in flow strength as a function of temperature, a maximum in average …