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Palladium And Nickel Interactions With Stepped 6h-Silicon Carbide, Andrew A. Woodworth
Palladium And Nickel Interactions With Stepped 6h-Silicon Carbide, Andrew A. Woodworth
Graduate Theses, Dissertations, and Problem Reports
Silicon carbide (SiC) has long been recognized as a semiconductor with potential for use in a number of demanding environments. Recent developments in the quality of bulk grown 6H-SiC (and other hexagonal poly-types) have increased interest in issues surrounding the stability of device structures that operate at temperatures in excess of 600°C. It has been observed that the performance of metal-semiconductor devices created on SiC tend to degrade when operating at these temperatures. This change in device performance has been linked to inter-diffusion and reaction at the metal-semiconductor interface. Most of these devices have been fabricated on SiC substrates with …
Water Vapor Diffusion Through Glass Fiber Reinforced Polymer Nanocomposites, Mohit Bhardwaj
Water Vapor Diffusion Through Glass Fiber Reinforced Polymer Nanocomposites, Mohit Bhardwaj
Graduate Theses, Dissertations, and Problem Reports
Fiber reinforced plastics (FRPs) are used to make aircraft structures, highway bridges, automobile components, storage tanks, boat hulls, truck beds, and so on. When these FRPs are exposed to the atmosphere, environmental humidity can weaken the structural integrity and cause fiber delamination. The use of glass-fiber-reinforced nanocomposites made by addition of nanoclay, reduces the fiber damage and delamination because of its ability to enhance the barrier property of the matrix material. Clay not only acts as a barrier toward moisture diffusion, it also sequesters the moisture and protects the glass surface. During the course of this study the role of …
Roughening Of Cobalt Thin Films On Sapphire (110) Upon Annealing And Superparamagnetic Behavior Of Cobalt Nanodots On Sapphire (001), Jorge Espinosa
Roughening Of Cobalt Thin Films On Sapphire (110) Upon Annealing And Superparamagnetic Behavior Of Cobalt Nanodots On Sapphire (001), Jorge Espinosa
Graduate Theses, Dissertations, and Problem Reports
Atomic force microscopy (AFM) was employed to investigate the surface roughness of 5.0 nm thick Co films as a function of the annealing temperature. Films were epitaxially grown on (110) sapphire via molecular beam epitaxy (MBE) and magnetron sputtering. Images were acquired in-situ at temperatures ranging between room temperature and 600°C. Surface roughening starts at 425°C and increases depending on the final annealing temperature and time. The films did not show a reversal of the roughening process upon sample cooling. Also a sub-monolayer film of Co was grown on Al2O 3 (0001) via MBE at room temperature. The film annealed …
Finite-Element Modeling Of A Composite Bridge Deck, Suraj Suraj
Finite-Element Modeling Of A Composite Bridge Deck, Suraj Suraj
Graduate Theses, Dissertations, and Problem Reports
Fiber Reinforced Polymer (FRP) materials are being widely used for structural applications, an example being bridge decks. In this study a finite-element model using the software ANSYS is developed for an 8&inches;-thick low-profile FRP bridge deck (Prodeck 8) made of E-glass fiber and Polyester resin. The bridge deck is subjected to a patch load at the center and the finite-element results obtained in the form of deflections, strains, and equivalent flexural rigidity are compared with experimental results. A good correlation is found to exist between the finite-element results and the experimental results. A failure analysis, based on maximum stress, maximum …
Development Of A Transparent Indenter Measurement System And Indentation Analysis For Material Mechanical Property Evaluation, Chuanyu Feng
Development Of A Transparent Indenter Measurement System And Indentation Analysis For Material Mechanical Property Evaluation, Chuanyu Feng
Graduate Theses, Dissertations, and Problem Reports
Since Tabor showed the application of the spherical indentation approach to obtain material post-yielding true stress-strain curves, the indentation technique has been investigated to determine mechanical properties besides hardness measurement. With the development of various thin film materials, depth-sensing indentation is often applied to evaluate mechanical properties of thin film materials. However, indentation testing is a complicated mechanical process and analytical solutions are difficult to obtain. As a result, much of the understanding of the indentation process has been acquired through experiments and finite element simulations. Thus accurate measurement of indentation parameters is critical in the determination of surface mechanical …