- منطقة بودونغ الجديدة ، شنغهاي ، الصين .
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An experimental investigation of distributed sand-grain surface roughness effects on hypersonic boundary-layer transition and turbulent heating has been performed. Two representative entry vehicle geometries, a sphere-cone aeroshell and a spherical-cap aeroshell, were considered. Cast ceramic models of each geometry were fabricated with …
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The existence and the propagation of cracks will affect the combustion efficiency of solid propellant, and the thermal field of grain with cracks needs to be simulated. In this paper, we applied one of the Particle Methods, Moving Particle Semi-implicit Method, to the investigation of the thermal field on solid propellant grain with …
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The influence of grain boundaries on material deformation in Ni3Al was investigated by relating the material pile-up at grain boundaries and the propagation of slip across grain boundaries to the misorientation between the corresponding grains. Indentation tests were carried out using micro- and nanoindentation at distances shorter …
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First-principles investigation of grain boundary structure effects on hydrogen solubility and segregation in tungsten. Wenhao He a School of Nuclear Science and Technology, Lanzhou University, Lanzhou, ChinaView further author information,
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This letter investigates the influences of grain boundaries in the drain junction on the performance and reliability of laser-crystalized poly-Si thin film transistors (TFTs). A unique test structure where the channel region includes 150-nm-thick laser-crystalized poly-Si with small grain sizes and a 100-nm-thick one with large grain sizes is fabricated. Different …
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Effects of solid grains with different concentrations on cavitation evolution around NACA0015 hydrofoil were investigated. The concentrations were 5%, 10%, and 20%. Variations of averaged lift and drag coefficients and lift-drag ratio under all concentration conditions were analyzed; corresponding evolution processes of cavitation bubbles were …
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Grain/bed collisions play a significant role in the transportation of granular materials, especially in windblown sand movements. In this study, grain/bed collisions regarding two sand grains simultaneously impact onto a mix-sized sandy bed are numerically investigated by the discrete element method (DEM).
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Investigation o the nuence o rain-cale eterogeneity on trainburst Proneness sing… 409 1 3 that knowledge, e.g. through the inclusion of petrographic information, in strainburst risk assessment. To improve the understanding of the failure process and its relationship to rocks' heterogeneity at the grain-scale, a
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The grain development and filling are primarily associated with the translocation of sucrose, and precursors of proteins, fats, and minerals from the leaves to grains . Thus, in our study, the content of grain metabolites of different classes could be associated with the content of carbohydrates, proteins, amino acids, and proline.
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Effects of grain crushing on strength, dilatancy, deformation and failure mechanisms have been extensively investigated through laboratory testing, discrete element method (DEM) modelling, Weibull statistics, and constitutive modelling within …
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In order to investigate the grain refinement mechanism in the shear band of Ti-6Al-4V during machining, we quantitatively analyzed the final microstructural characteristics including the grain size, grain boundary misorientation, and geometrical necessary dislocation (GND) density distribution in shear bands by precession electron …
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Often, a 〈111〉 orientation tended to align with the shear direction. Following 12 ECA passes, the grain size was reduced further to about 1.0 µm. The populations of high-angle boundaries (≥15 deg) increased in the disorientation distribution. ... An investigation of microstructure and grain-boundary evolution during ECA pressing of pure ...
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The mechanical behavior of a granular medium is closely related to its saturation state. One of the underlying phenomena controlling this dependence is particle breakage. In the presence of water, the strength of a particle is weakened through various physical–chemical processes, which lead to an increase in the intensity of particle …
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A positive correlation between grain size and the number of nearest neighbors of surface grains was observed; however, considerable variability exists per grain. We also present a detailed investigation of 3D surface grain structure and highlight the limitations of 2D surface grain characterizations.
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To figure out the impact of the parameters of a starter block (the diameter D and height H) on grain selection and the selecting mechanism, a spiral selector was measured with optical microscopy (OM) and electron backscatter diffraction (EBSD) during the solidification of Ni-based single crystal (SX) superalloys. In this experiment, starter …
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We study four double-gyroid (DG) grain boundaries (GBs) with different orientations numerically using the Landau--Brazovskii free energy, including the (422) twin boundary studied recently, a network switching GB, and two tilt GBs. Topological variations and geometric deformations are investigated. It is found that deviations in strut lengths …
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Investigation on effect of grain orientation in photochemical machining of Monel 400. Deepakkumar Himmatrao Patil Department of Mechanical Engineering, Dr. Babasaheb Ambedkar Technological University, Lonere, ... owing to the grain boundary orientations along the (001) plane. In addition, the etching depth increased along the …
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Investigation of Grain Refinement Method for AZ91 Alloy Using Carbide Inoculation Jun Ho Bae, Young Min Kim, Ha Sik Kim, and Bong Sun You Abstract Grain refinement is an effective method to increase both the strength and toughness of structural materials. Among the various grain refinement methods, carbon inoculation
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