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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Virial stress ： ウィキペディア英語版 Virial stress Virial stress is a measure of mechanical stress on an atomic scale. It is given by :$\backslash tau\_\; =\; \backslash frac\; \backslash sum\_\; \backslash left(-m^\; (u\_i^-\; \backslash bar\_i)\; (u\_j^-\; \backslash bar\_j)\; +\; \backslash frac\; \backslash sum\_\; (\; x\_i^\; -\; x\_i^)\; f\_j^\backslash right)$ where * $k$ and $\backslash ell$ are atoms in the domain, * $\backslash Omega$ is the volume of the domain, * $m^$ is the mass of atom ''k'', * $u\_i^$ is the ''i''th component of the velocity of atom ''k'', * $\backslash bar\_j$ is the ''j''th component of the average velocity of atoms in the volume, * $x\_i^$ is the ''i''th component of the position of atom ''k'', and * $f\_i^$ is the ''i''th component of the force applied on atom $k$ by atom $\backslash ell$. At zero kelvin, all velocities are zero so we have :$\backslash tau\_\; =\; \backslash frac\; \backslash sum\_\; (\; x\_i^\; -\; x\_i^)\; f\_j^$. This can be thought of as follows. The τ11 component of stress is the force in the ''x''1-direction divided by the area of a plane perpendicular to that direction. Consider two adjacent volumes separated by such a plane. The 11-component of stress on that interface is the sum of all pairwise forces between atoms on the two sides. ==See also== * Virial theorem 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Virial stress」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.