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Showing 1 to 12 of 12 for “"grain size effects"”.
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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 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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Energy transfer and grain size effects during the Standard Penetration Test (SPT) and Large Penetration Test (LPT)
… in sands. Variation of LPT blow counts with grain size is assumed to be negligible. This research shows that safety hammer energies can be reliably estimated from measurements of hammer impact velocity for both SPT and LPT. This approach to determining transferred energy is relatively simple, …
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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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Effect of manganese and nickel on the cleavage fracture strength of ferritic weld metal
… examined by scanning electron microscope and grain size measurements made by optical microscopy. Lower shelf impact energy measurements were also made. The results show that both manganese and nickel individually increased the cleavage fracture strength. In combination the best cleavage …
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Predictive Microstructural Modeling of Grain-boundary Interactions and Their Effects on Overall Crystalline Behavior
A dislocation-density grain boundary interaction scheme (DDGBI) has been developed to account for complex interrelated dislocation-density interactions of emission, absorption and transmission in grain-boundary (GB) regions for bicrystals and polycrystals with different random and coincident site …
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Sediment Dynamics in a Dryland River: Grain-Size Variations, Erosion Rates, Sediment Mixing and Dam Effects
… floods often set channel form and sediment grain size patterns for long periods of time. The large natural variability in dryland river stream flow causes susceptibility to geomorphic alteration when they are dammed. Cosmogenic nuclide analysis, a tool for determining catchment-wide erosion …
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Sediment Dynamics in a Dryland River: Grain-Size Variations, Erosion Rates, Sediment Mixing and Dam Effects
… floods often set channel form and sediment grain size patterns for long periods of time. The large natural variability in dryland river stream flow causes susceptibility to geomorphic alteration when they are dammed. Cosmogenic nuclide analysis, a tool for determining catchment-wide erosion …
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Interaction of earthquake fault rupture with shallow foundations
… this research is to imrpove understanding of the effects of earthquake fault propagation through soil and its interaction with shallow foundations. Physical modelling was carried out using the geotechnical centrifuge at the Universtiy of Dundee, where models of soil-foundation systems were …
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Size Effects in Shape Memory Ceramics
… cracking due to mismatch stresses arising at the grain boundaries. Current strategies for mitigating cracking in SMCs involve moving towards smaller volume structures, which feature high surface area for stress relaxation and fewer grain boundaries to minimize transformation stresses. While this …
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Modelling fine sediment transport over an immobile gravel bed
Fine-grained sediment represents a significant component of the total transport load in most fluvial systems around the world that are not limited to the alluvial rivers with sandy beds. A variety of natural or human actions, such as fire, logging, flow diversion, road construction, and urban or …
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Effect of microalloying on pearlite transformation of high carbon wire steels
… trends in hardness and microstructural feature sizes observed in continuous cooling tests persist through industrial hot rolling simulations. An industrially hot rolled 1080 wire rod with vanadium additions and three laboratory-prepared alloys were studied. The base alloy, denoted the V steel, …