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Showing 1 to 20 of 813 for “"grain size"”.
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Incorporating Grain Size Effects in Taylor Crystal Plasticity
<p>A method to incorporate grain size effects into crystal plasticity is presented. The classical Hall-Petch equation inaccurately predicts the macroscopic yield strength for materials with non-equiaxed grains or materials that contain unequal grain size distributions. These deficiencies can be …
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Grain size evolution and strain localization in deformed marbles
… and such microstructural characteristics as grain size and crystallographic preferred orientation (CPO) by combining laboratory studies with field based observations. In Chapter 2, a scaling relationship for recrystallized grain size is derived based on a balance between the rate that …
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Remote estimation of grain size distribution and simulating grain size effects on debris-flow rheology and post-fire variability of transport by dry ravel
The size distribution of granular material influences the length scale of sediment transport by dry ravel and debris flows. Variability in erosion rates and the grain size distribution of material delivered to channels has been observed due to an increase in the annual areal extent of wildfire in …
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The Effect of Average Grain Size on Polycrystalline Diamond Films
… molybdenum substrates by electrophoresis for grain sizes ranging from 0.3 to 108 microns. The work function and electron affinity were measured using 21.2 eV photons from a helium plasma source. The films were characterized by x-ray photoelectron spectroscopy to determine elemental composition …
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Grain size distributions of various materials in an abrasion mill
Wet abrasion of sand-sized quartz and orthoclase in polyethylene bottles for 912 hours showed that abrasion of fine material is practically negligible, in agreement with Kuenen (1959). The size distributions of the sand. sized quartz and orthoclase remained unchanged. The size distributions of …
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Grain size effects on the fatigue response of nanocrystalline materials
… is known to be influenced significantly by grain size. Based on a wealth of experimental results obtained from microcrystalline metals, where the grain size is typically greater than 1 um, it is widely recognized that an increase in grain size generally results in a reduction in the fatigue …
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Influence of grain size, morphology and aggregation on galena dissolution
… wet-chemical methods. The effects of particle size, shape, aggregation state, and grain proximity on dissolution rates were investigated. Nearly monodisperse galena nanocrystals with an average diameter of 14.4 nm and a truncated cubic shape were synthesized. In the dissolution experiments of …
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Grain size management in repetitive task graphs for multiprocessor computer scheduling
… schedules, which involves testing different grain size modified versions of the task graph to find the one that results in the highest throughput for the given scheduling algorithm. Our heuristic works by alternately fusing or fissioning selected tasks of the graph then evaluating the …
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Austenite grain-size control at elevated temperature in microalloyed carburizing steels
Includes bibliographical references (pages 194-208).
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Grain size control and microstructural evolution in nanocrystalline Ni-W alloys
… superior to those realized in traditional coarse-grained materials. A fundamental challenge, however, involves the synthesis of high-quality specimens, which represent a classical far-from-equilibrium state due to the large presence of high-energy interfaces. Alloying presents a possibility to …
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Machine Vision for Road Pavement Applications Bitumen Coverage and Grain Size Estimation
… quality control of asphalt is to estimate the size distribution in an asphalt sample and see if it corresponds to the recipe for the asphalt. This is investigated in the third paper, where slices of the asphalt are analyzed. The analysis consists of segmenting the stones individually so that …
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Grain size effect on structure and properties for chemically-prepared barium titanate
… when prepared as a powder with small particle size $({<}1\mu$m) or as a polycrystalline ceramic with small grain size, displays dramatic deviations in crystal structure and electrical properties, compared with forms involving larger crystallite sizes. Specifically, ceramists have been concerned …
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Impact of Porous Media Grain Size on the Transport of Multiwalled Carbon Nanotubes
… placed on the impact of varying mean collector grain size on MWNT retention. Results from one dimensional column experiments conducted under various physical and chemical conditions coupled with results of numerical modeling assess the suitability of traditional transport models to predict MWNT …
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Investigation of the relationship between permeability and grain size of lucite spheres, An
Includes bibliographical references.
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A Theory of Fatigue of Metals Based on A Statistical Distribution of Grain Size
Made available in DSpace on 2014-12-04T23:10:50Z (GMT). No. of bitstreams: 1 0004462.pdf: 5181273 bytes, checksum: e4579d709c0b3dbbca2d05d83311b09a (MD5) Previous issue date: 1952
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On a Bimodal Distribution of Grain Size in Mechanically Alloyed Bulk Tungsten Heavy Alloys
… with 2, 4 and 6 wt.% Ni. Evidence of a bimodal grain size distribution was seen in X-ray diffractograms of sintered samples and confirmed by scanning electron microscopy. Grain sizes in the small-grained regions ranged from 200–600 nm; those in the large-grained regions ranged from 1–2 µm. …
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Effect of grading and grain size on the friction characteristics of a sand/geotextile inteface
… interacting with sands of different grading, grain size distributions and grain shapes namely; Cape Flats, Klipheuwel and Munich sands. The respective responses were primarily presented in terms of shear stress/horizontal displacement and pUll-out resistance/front displacement relationships; …
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