Abstract
A general Monte Carlo simulation method of calculating the elastic constants of a polydisperse hard-sphere colloidal crystal is developed. Elastic constants of a size-polydisperse hard-sphere fcc crystal are calculated. The pressure and three elastic constants ( C11, C12, and C44 ) increase significantly with the polydispersity. It was also found from extrapolation that there is a mechanical terminal polydispersity above which a fcc crystal will be mechanically unstable.
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