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 31 for “"Sample geometry"”.
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Evaluation of stress state on the mechanical properties of 3D printed metallic lattice structures fabricated via laser powder bed fusion for orthopedic applications
… mechanical behavior. The findings showed that sample geometry and test setup significantly impacted the mechanical properties of metallic lattice structures, which led to the design of a universal sample geometry that enabled the utilization of a single sample for tensile, compressive, and …
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Thin -Film Adhesion Measurement by Laser -Induced Stress Waves
… parametric study results, the planar tensile sample geometry is modified to a triangular prism so that a high strain rate shear wave is generated and then allowed to impinge upon the test film. By allowing the initial longitudinal wave to mode convert to a shear wave and a secondary …
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Automating radiation damage studies of materials irradiated by high-energy protons using multiphysics simulations
… to find the change in temperature across a sample. The range simulations generate 1D slabs with different thicknesses and bombards them with high-energy proton beams. The slabs are automatically sorted, a meshed geometry is created, and the recoil energy information is entered into a …
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Crack Tip Micromaching by Femtosecond Laser for Fracture Testing of Metal Laminates
… the heat affected zone and create an etched geometry mimicking a crack into the sample to facilitate crack propagation in bend testing. Finally, simulation is performed using ANSYS to determine sample geometry constraints induced by both the laser-notched crack tips geometry and the …
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Spectroscopic observation of materials under dynamic conditions
… generation, propagation, and convergence in a sample. The approach opens up new possibilities for controlling the shock parameters and allows one to access pressures in the multiple gigapascal range. Optical generation of shock waves is followed by optical measurement of sample response during …
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Methods for the analysis of thermomagnetic phase transitions of magnetocaloric materials
… data and numerical calculations. These are sample geometry, compositional inhomogeneities, low temperature limitation in heat capacity measurements and measurement protocols in direct techniques. After that, it is shown that the analysis of the magnetic eld dependence of the magnetocaloric e …
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Rheology and processing of mozzarella cheese
… that the yield stress, duration of experiment, sample geometry and temperature greatly affect the consistency of the results. It was also shown that extrusion can be used as a processing technique for mozzarella cheese above a certain temperature where the cheese is in a melt state. Rolling was …
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EM field effects on the surface of polluted HV insulators
… discharge activity. Chapter 7 describes test sample geometry and electric field modeling using finite element analysis. Chapters 8 and 9 describe an experimental study of breakdown at a sessile water droplet on a planar, polymeric, insulating surface subject to ac stress, parallel to the …
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An experimental study of hydraulic fracture and erosion
… fracture was examined in the laboratory on samples of puddle clay from the core of Cwmernderi Dam in modified Bishop and Wesley triaxial cells. Various sets of tests examined the effects of sample geometry, loading rate and overconsolidation on the initial fracturing pressure and examined …
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ENGINEERING THE COMPLEX ELECTRICAL RESPONSE OF METALLIC CLUSTER-ASSEMBLED FILMS FOR NEUROMORPHIC COMPUTING APPLICATIONS
… My analysis also highlighted the impact of sample geometry and dimension on the number and distribution of the switching regions. Furthermore, I probed the electrical response to different stimuli, and I observed stereotyped behaviours that emerge from the average response of the switching …
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Study of the effect of molten CuCl immersion test on alloys with high Ni-content with and without surface coatings
… in the original coated specimens indicating the sample geometry may have affected the integrity of the sprayed coating. When the coating cracked, it provided a pathway for the molten CuCl to go under the coating and react with the surface underneath the coating. Copper deposits and iron chloride …
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The scattering of high-frequency acoustic phonons in silicon and GaAs
… is raster scanned across the surface of the sample which is immersed in liquid helium. After they propagate across the sample, the acoustic phonons produced by the heat .source are detected by a small superconducting detector. The spatial distribution of the ballistic phonon flux is highly …
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Three-dimensional polarization probing in polymer ferroelectrics, polymer-dispersed liquid crystals, and polymer ferroelectrets
… The diffusion of the heat causes changes in the sample geometry, generating a short-circuit current or change in surface potential, which contains information about the spatial distribution of electric dipoles or space charges. Afterwards, a reconstruction of the internal electric field and …
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THE STRENGTH OF BRAZED SINGLE-LAP JOINTS
… stress states of the most common braze strength samples are reviewed in the Background section of this dissertation—as a concise review of this material does not exist in the open literature). This current statis quo is clearly unacceptable. In this work, we combine micromechanics, continuum …
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Development of Instrumental and Computational tools for investigation of polymer flammability
… properties and extrinsic parameters such as sample geometry and orientation. They do not provide a true measure of flammability, and formulations can be optimized to pass the test even though they are highly flammable. A more quantitative approach is to use larger bench scale flammability …
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Graphite-enabled Cementitious Composites: A Smart and Resilient Solution for Future Infrastructure
… the measured electrical resistance and the sample geometry variables has been proposed for the first time to provide design guidance for the measurement techniques. Electro-mechanical tests were conducted to investigate the piezoresistivity and damage-sensing performance of the developed …
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Measurement of displacements in granular systems in response to penetration and compaction
… displacement fields within large opaque granular samples. Large samples are desirable as the measured displacements are more representative of the bulk. Current DICC algorithms were found to be unsuitable for analysis of X-ray images of large samples. The large contrast variations present in such …
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Laser-induced breakdown spectroscopy applied to pasture, titanium, and bioplastics
… pulsed laser to create a plasma on the sample surface. As the plasma cools, photons are emitted at distinct wavelengths corresponding to the elemental composition in the plasma, which should represent the sample. This thesis investigates using LIBS as a sensor for precision agriculture. …
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Microvascular strategies for damage restoration
… the careful control of delivery parameters and sample geometry. Additionally, a series of epoxy-based healing agents is characterized to determine response time, viscosity, surface tension, thermal performance, and fracture properties with the goal of improved healing response. In addition to …
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Studying phonon mean free paths at the nanoscale : modeling and experiments
… function appropriate for the experimental sample geometry relates the measured apparent thermal conductivities to the material's phonon MFP distributions. We develop a multi-dimensional thermal transport model based on the gray phonon BTE to find the suppression function relevant to our …
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