By Mohammed Cherkaoui;Laurent Capolungo
Atomistic and Continuum Modeling of Nanocrystalline Materials
Atomistic and Continuum Modeling of Nanocrystalline Materialsdevelops an entire and rigorous state of the art research of the modeling of the mechanical habit of nanocrystalline (NC) fabrics. between different key issues the cloth makes a speciality of the radical suggestions used to foretell the habit of nanocrystalline fabrics. specific awareness is given to fresh theoretical and computational frameworks combining atomistic and continuum techniques. additionally, the main suitable deformation mechanisms governing the reaction of nanocrystalline fabrics are addressed and mentioned in correlation with on hand experimental information.
Drawing upon years of sensible and educational adventure and utilizing quite a few examples, authors Mohammed Cherkaoui and Laurent Capolungo hide a large spectrum of fabric, together with:
New modeling innovations and their power purposes and attainable extensions, reminiscent of molecular dynamics, pressure gradient dependent finite aspect simulations, and novel micromechanical schemes
Novel versions describing plastic deformation strategies taking place in nanocrystalline fabrics together with grain boundary dislocation emission
How to build and use a molecular dynamics code for sensible use within the modeling of NC fabrics
Atomistic and Continuum Modeling of Nanocrystalline fabricsis a must-have ebook for researchers in addition to graduate scholars who're both getting into those fields for the 1st time, or these already carrying out study during this region and desiring to expand their wisdom of nanocrystalline materials.
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Extra resources for Atomistic and Continuum Modeling of Nanocrystalline Materials: Deformation Mechanisms and Scale Transition
Indeed, as shown in Chapter 1, the sample microstructure is a direct consequence on the fabrication process which so far is particular for each, mostly academic, laboratory. Second, the measurement of several properties of NC materials is rather complicated. Let us cite two stringent examples. 2% offset rule. However, in the case of NC materials, the samples are typically of reduced dimensions and it is not always possible to perform a tensile test on the samples. Hence, nanohardness measurements are often performed and the yield stress is simply deduced by dividing the hardness by 3.
The effect of grain size distribution, although not regarded as of primary importance in early studies on NC materials, can affect the response of the sample. Indeed, considering a log-normal grain size distribution with a given mean grain size and varying variance, it was predicted via a Taylor type of model that, depending on the variance, the ultimate stress can drop by several hundred MPa . ) and/or TEM . However, the evaluation of the grain size distribution remains a complicated exercise and a very limited set of data, too limited to draw conclusions, were reported for in situ consolidated nanograins powders.
The apparatus is composed of a glass cylinder fitted to water tubes which will cool a Cu plate on which the nanoparticles will be collected. A crucible containing the metal sample is placed within the tube near a graphite element heated by an optical pyrometer. ). The resulting grain size distribution is well described with a log normal distribution. Fig. 16 Schematic of the apparatus used for evaporation from a crucible  20 1 Fabrication Processes Electron beam evaporation typically consists of heating a melt confined in a water-cooled container via an energy input from an electron beam guided with a magnetic field .
Atomistic and Continuum Modeling of Nanocrystalline Materials: Deformation Mechanisms and Scale Transition by Mohammed Cherkaoui;Laurent Capolungo