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 24 for “"Effect of microstructure"”.
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Effect of microstructure on mechanical behaviour of arterial tissue
The total number of annual deaths caused by cardiovascular diseases (CVDs), aortic aneurysms (AAs) and aortic dissections (ADs) is more than from any other cause. Most CVDs are a result of atherosclerosis, in which a fibrous cap covered lipid-rich plaque is formed in the arteries. The fibrous cap …
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Effect of microstructure on the fracture response of advanced high strength steels
The materials selected to observe microstructural effects on formability included four 780 MPa strength, and four 980 MPa strength AHSS grades produced with varying processing conditions. The grades were an uncoated DP780, a high yield DP780, a galvanized DP780, a TRIP780, a galvannealed DP980, a …
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Effect of Microstructure on Mechanical Properties of High Strength Steel Weld Metals
The effects of variations in alloying content on the microstructure and mechanical properties of high strength steel weld metals have been studied. Based on neural network modelling, weld metals were produced using shielded metal arc welding with nickel at 7 or 9 wt. %, manganese at 2 or 0.5 wt. % …
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Simulation of the effect of microstructure on electromigration induced failure of interconnects
Thesis (M.S.)--Massachusetts Institute of Technology, Dept. of Civil and Environmental Engineering, 1997.
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The effect of microstructure on the fracture toughness of a high strength steel
The relationship between heat treatment, microstructure, fracture topography and room temperature fracture toughness has been determined for a high strength low-alloy steel, En 25. 0ptical, transmission and scanning electron microscopy were used to characterize the structure and morphology while …
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Thermal Transport on the Nanometer Scale and the Effect of Microstructure and Interface Resistance
The aim of this research is to provide a better understanding of the physics of phonons involved in thermal transport on nanometer scale and to address the need for systematic information about the thermal properties of ultra-thin films. The present work includes data on thermal transport in dense …
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Effect of microstructure of aluminum alloys on the electromigration-limited reliability of VLSI interconnects
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Materials Science and Engineering, 1990.
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Probing the effect of microstructure on water diffusion in engineered or biological materials with MRI
… mass transport process due to the presence of barriers at multiple scales and the anisotropic structure of muscles. Magnetic Resonance Imaging (MRI) is an effective non-invasive technology for studying water transport in biological or engineered systems, and has been increasingly used to …
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The effect of microstructure on the fatigue and fracture properties of vintage power rotor steels
MIT's Alcator C-Mod fusion experiment makes use of a large spinning mass coupled to a generator as its power source. A significant fraction of this mass consists of a 225 MVA generator rotor that was retired from power plant service. As part of normal maintenance, a periodic inspection by …
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A Lattice Boltzmann method model of diffusion-weighted magnetic resonance imaging in skeletal muscle
… function and health. Probing the cellular microstructure of skeletal muscle with noninvasive methods is paramount in developing effective therapeutic procedures for the elderly, such as physical exercise. Using special proton magnetic resonance imaging (MRI) protocols we can investigate …
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Dielectric studies of novel polymeric systems
… techniques in an effort to enhance understanding of molecular motions of polymers and. how they are influenced by' structure. The primary characterization method was dielectric spectroscopy which utilizes an AC electric field as the stress field. A variety of new, well controlled polymeric systems …
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Relationship between Microstructure, Properties and HICC Resistance of HSLA steel weld metals
The effects of microstructure, mechanical properties and hydrogen content on the hydrogen induced cold cracking (HICC) resistance of high strength low alloy (HSLA) steel weld metals were studied in this investigation. The weld metals were designed in a previous work. Their microstructures were …
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Fatigue mechanisms in FV520B, a turbine blade steel.
… investigation has been undertaken to examine the effect of microstructure on the mechanical properties of FV520B, a precipitation hardenable martensitic stainless steel. This high performance grade of stainless steel was heat treated to three commercially available material specifications, namely …
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Studying the effect of Cu microstructure on electromigration reliability using statistical simulation
… The mass transport occurs in decreasing order of magnitude along interfaces grain boundaries and in bulk. The diffusivities along interfaces and grain boundaries are determined by crystallographic orientation. Diffusion discontinuities can create flux divergent sites that control void growth …
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Factors contributing to the yield strength of polycrystalline nickel-based superalloys
Nickel-based superalloys are the material of choice for use in the hottest regions of gas turbine engines due to their inimitable mechanical properties, in particular, high temperature strength. As we become increasingly aware of the environmental consequences of air travel, manufacturers are …
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On the plastic deformation behaviour of nickel-based superalloys: low cycle fatigue and stress orientation effects
… dissertation expands upon the current knowledge of plastic deformation in nickel-based superalloys, with a focus on dislocation mechanisms and the effect of microstructure. The two main topics treated are the evolution of the dislocation structure during low cycle fatigue and the effect of …
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Sulfide stress cracking resistance of API-X100 high strength low alloy steel in H2S environments
Sulfide Stress Cracking (SSC) resistance of the newly developed API-X100 High Strength Low Alloy (HSLA) steel was investigated in the NACE TM0177 "A" solution. The NACE TM0177 "A" solution is a hydrogen sulfide (H2S) saturated solution containing 5.0 wt.% sodium chloride (NaC1) and 0.5 wt.% acetic …
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Effect of grain structure and doping on the mechanical properties of polysilicon thin films for MEMS
… applications could be engineered by modification of the material microstructure. Such advances require detailed experimental studies and quantitative understanding of the convoluted effects of the processing methods on the ensuing mechanical properties. This dissertation investigated the role of …
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Multiscale Experimental Analysis in Plasticity: Linking Dislocation Structures to Continuum Fields
… in metals is a complex phenomenon and is result of competition between different complicated mechanisms, and among all, dislocation nucleation and motion are the most dominant ones. Dislocation evolution is known to be a multiscale phenomenon, and has been incorporated to crystal plasticity …
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