TY  - JOUR
T1  - A New Simulation Method for Characterization of Mechanical Properties of Nanomaterials
AU - Arabshahi, H. AU - Ebrahimi, G.R. 
JO  - Agricultural Journal
VL  - 6
IS  - 1
SP  - 7
EP  - 9
PY  - 2011
DA  - 2001/08/19
SN  - 1816-9155
DO  - aj.2011.7.9
UR  - https://makhillpublications.co/view-article.php?doi=aj.2011.7.9
KW  - Simulation methods
KW  -mechanical properties
KW  -atomic scale
KW  -grain boundries
KW  -Iran
AB  - 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.
ER  -