Abstract
Structure and mechanical damping of nanostructures have been investigated by means of molecular dynamics simulations. Embedded atom method potential was adopted in the simulation. Four copper model samples of nanoparticle were prepared. These were perfect single crystal, single crystal with interstitials, polycrystalline state, and amorphous state. Each system consisted of 5000 atoms. The mechanical damping of these particles was investigated by monitoring the elastic and thermal motion of atoms after the initial deformation of tetragonal and of dilatational strains. The mean elastic strain was calculated to evaluate the elastic damping. The vibration continued for a long time in a single crystal sample, and it quickly damped in polycrystalline and amorphous samples. The mechanical damping was increased by introduction of interstitials. The process of the thermalization was also investigated through the time variation of the velocity distributions. The distribution attained a thermal equilibrium in a short time for the polycrystalline and amorphous samples.
Published Version
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