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 26 for “"Aerospace Materials"”.
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Computational Reconstruction and Quantification of Aerospace Materials
… alloy, respectively. Both of them are candidate materials for many aerospace systems owing to their desirable mechanical performance under large thermo-mechanical stresses.
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An investigation into Vibratory Grinding of hard-to Machine Aerospace Materials
… manufacturing processes. However, progress in materials science has led to the development of new materials especially in the aerospace industry, where high heat resistance materials are preferred such as Ti-6Al-4V. These new materials have different mechanical properties from conventional …
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A Study on the Micro Electro-Discharge Machining of Aerospace Materials
… of difficult-to-cut Ti-6Al-4V and soft brass materials. As both materials are electrically conductive, they were machinable using the micro-EDM process irrespective of their hardness. The machining performance of the two materials was evaluated based on the quality of the micro-features …
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Nondestructive Analysis of Advanced Aerospace Materials via Spectroscopy and Synchrotron Radiation
Advanced aerospace materials require extensive testing and characterization to anticipate and ensure their integrity under hostile environments. Characterization methods utilizing synchrotron X-Ray diffraction and spectroscopy can decrease the time required to determine an emerging material's …
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Development of a multiple-specimen, reversed-flexure fatigue tester and its application to the testing of titanium sheet
… increases the demands on existing engineering materials. These demands are extremely severe for aerospace materials where the necessity for a higher strength-to-weight ratio is complicated by little understood environmental effects. A major consideration when designing structures is the fatigue …
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A parametric study of delaminations in an aluminum-lithium alloy
… aluminum-lithium alloys at the forefront of aerospace materials research. Delaminations in these alloys play a significant role in their fracture processes. Therefore, a more complete understanding of the factors that influence the behavior of these delaminations and their corresponding …
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Open Source Toolkit for Reentry Object Modeling
… accuracy and speed improvements.</p> <p>77 aerospace materials were tested, in solid spheres, cubes, and cylinders; it was found that materials with low latent heat of fusion (less than 10 kJ/kgK) demise before reaching the ground, while materials with higher melting point temperatures (over …
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Robust optimal boundary and spatial field control of distributed parameter systems
… An increasing number of DPS control problems in aerospace, materials, chemistry, biology, and other disciplines have attracted many mathematicians and engineers to this field in recent years. Many of these applications have been driven by new technologies for manufacturing, actuation, and …
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Design variables for steel and aluminium in high-rise rooftops
… finite element modelling • Examination of all materials issues in order to prevent re-occurrence of structural degradation and corrosion • Consideration of relevant environmental effects on the materials • Implementation of these design solutions using novel aerospace materials and methods • …
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Measurement of Continuum Breakdown Using a Disc Spin-Down Experiment in Low Pressure Air
… by previous researchers cannot accommodate for materials that are planar by nature such as those used in the field of aerospace and microfabrication. The objectives of this research include the experimental measurement of continuum breakdown in a macro-scale boundary layer flow, development of a …
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Feasibility Study of an Axially-Stacked, Subsonic Propeller System
With the aerospace industry pushing for an increased production and application of unmanned aerial vehicles (UAVs), humans will increasingly become exposed to noise pollution emanating from above. Fortunately, electric motors have and will continue to gain an ever-prominent role in the power plant …
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Investigations of Hypervelocity Impact Physics
… immense shock pressures and can melt or vaporize aerospace materials, even inducing brief plasmas at higher speeds. Sacrificial shields have been developed to protect critical components from damage under these conditions, but the response of many materials in such an extreme event is still poorly …
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Impact of morphology and confinement effects on the properties of aligned nanofiber architectures
… of many application-specific nanostructured materials studies. However, various NF morphology and proximity effects can lead to > 1000x reductions in the performance of NF-based material architectures, such as bulk materials and structures comprised of scalable aligned NF arrays. The physical …
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Damping Parameter Study of a Perforated Plate with Bias Flow
… of combustion systems in industrial and aerospace applications including gas turbines, ramjets, rocket motors, afterburners (augmenters) and even large heaters/boilers is the dynamic instability also known as thermo-acoustic instability. Concerns with this ongoing problem have grown with …
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Fluid dynamics of pulsating jets and voice
Vortical structure plays a significant role in flow mechanisms that impact our everyday life.
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Experimental Investigation of NexGen and Gas Burner for FAA Fire Test
The NexGen (sonic) burner is a new burner designed by the Federal Aviation Administration (FAA) Tech Center for the required FAA fire certification tests on Powerplant. The objective of this study is to understand the performance of this burner and provide the benchmark to adapt the burner setting …
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Routing and Allocation of Unmanned Aerial Vehicles with Communication Considerations
<p>Cooperative Unmanned Aerial Vehicles (UAV) teams are anticipated to provide much needed support for human intelligence, measurement and signature intelligence, signals intelligence, imagery intelligence, and open source intelligence through algorithms, software, and automation. Therefore, it is …
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LS-Dyna for Crashworthiness of Composite Structures
<p>Composite materials have excellent mechanical and thermal properties and are the materials of choice for many applications. Even though, the low inter-laminar mechanical properties and poor impact resistance of fiber reinforced composite materials has limited their use. The study of axial …
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Effect of Flow Distortion on Fuel Mixing and Combustion in an Upstream-Fueled Cavity Flameholder for a Supersonic Combustor
Typical studies of scramjet combustion employ as uniform a flowpath as possible. These studies are important to isolate the effects of a given combustor configuration. However, such studies tend to ignore the effects of a shock train created by the vehicle installation and that this shock train …
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Leveraging Carbon Based Nanoparticle Dispersions for Fracture Toughness Enhancement and Electro-mechanical Sensing in Multifunctional Composites
… in 1990s popularized a new area of research in materials science called Nanoscience. In the following decades, several carbon based nanoparticles were discovered or engineered and with the discovery of Graphene nanoplatelets (GNP) in 2010, carbon based nanoparticles were propelled as the most …
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