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Finite Element Modeling of Damping Capacity in Nanocrystalline Materials

M. Yadollahpour, S. Ziaei-Rad, F. Karimzadeh

International Journal of Modelling, Simulation and Scientific Calculation (IJMSSC), Vol. 1, Issue 3, pp. 421, 2010



Plastic deformation of materials is a major source of energy dissipation during external loading. In nano-crystalline (NC) materials, local plastic strain may arise even if the overall external load is below the yield stress of the material because of the grain structure. In this paper, the damping capacity of nano-crystalline materials is modeled by considering the grain structure. First, the grains are modeled by using a composite model. The composite model takes each oriented crystal and its immediate boundary to form a pair. Next, the finite element method in conjunction with the composite model is employed to evaluate the energy dissipation of nano-crystalline material under cyclic loading. The influence of the grain size and the external loading on the energy dissipation is investigated numerically. Energy dissipation in each of the two parts (i.e. grain and grain boundary) is also calculated as an attempt to understand the effect of grain boundary on energy dissipation.


Energy dissipation; plastic deformation; grain and grain boundary


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