Master of Science (MS)
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Rheological studies of rocks and minerals allow researchers to study the grain-scale deformation mechanisms that govern large-scale geologic processes from mountain building to mantle mixing. Deforming rock samples with high pressure and temperature apparatuses similar to the Griggs piston cylinder apparatus allows us to simulate deformation at depth. However, many apparatuses are limited to “cook-and-look” analysis and require modeling techniques to determine the evolution of deformation patterns found in experimental samples. A previous study used two-dimensional finite element models to analyze the development of stress and strain patterns in polycrystalline rocks. The study suggested rhythmic patterns in deformed rocks develop as a result of stress percolating through the elastically and plastically disordered system. Furthermore, similar strain heterogeneities have been observed using 2D digital image correlation software that measures strain in experimentally deformed materials using computer algorithms that track incremental changes in optical images. This study used slabs of tiger’s-eye, a quartz aggregate made up of stacked columnar grains, to simplify the geometry of the material deforming in the Griggs apparatus. By modifying the traditional sample assembly from cylindrical to parallelepiped, I developed a method to use 2D digital image correlation for strain mapping of samples deformed at high pressure and track the microstructural changes within specific sets of grains before and after deformation with grain contrast imaging.
digital image correlation; experimental rock deformation; polycrystalline quartz; strain heterogeneity
Engineering Science and Materials | Geology | Materials Science and Engineering
Regis, Nolan Ambrose, "A Novel Approach to Analyzing Strain Heterogeneity in Polycrystalline Quartz Specimens Deformed at High Pressure and Temperature" (2018). UNLV Theses, Dissertations, Professional Papers, and Capstones. 3317.