H.  Arabshahi, G.R.  Ebrahimi, 
    A New Simulation Method for Characterization of Mechanical Properties of Nanomaterials,
    Agricultural Journal,
    Volume 6,Issue 1,
    2011,
    Pages 7-9,
    ISSN 1816-9155,
    aj.2011.7.9,
    (https://makhillpublications.co/view-article.php?doi=aj.2011.7.9)
    Abstract: A new simulation method has been developed and used to model mechanical properties of materials at many different length scales, from the nanoscale where an atomic description is appropriate, through a mesoscale where dislocation based descriptions may be useful to macroscopic length scales. In some materials, such as nanocrystalline metals, the range of length scales is compressed and a polycrystalline material may be simulated at the atomic scale. It is observed how the grain boundaries contribute actively to the deformation. At grain sizes below 5-10 nm deformation in the grain boundaries dominate over the traditional dislocation-based deformation mechanisms. This results in a reversal of the normal grain size dependence of the yield stress. It is shown that the material becomes softer when the grain size is reduced.
    Keywords: Simulation methods;mechanical properties;atomic scale;grain boundries;Iran