arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1107.1453cond-mat.mtrl-sci
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单层六方氮化硼力学性能的从头算研究

Mechanics properties of Mono-layer Hexagonal Boron Nitride: Ab initio study

Qing Peng, Amir R. Zamiri, Suvranu De

摘要:

介绍了一种利用从头算密度泛函理论对单层h-BN弹性性质进行连续描述的方法。通过将弹性应变能量密度展开为泰勒级数,在五阶项之后截断应变,来表示弹性响应的这种严格的连续描述。我们得到了14个非零的独立的弹性常数,直到十阶张量。我们预测的压力依赖的二阶弹性模量。这种连续体制剂是适合纳入有限元法。

英文摘要:

We introduced a method to obtain the continuum description of the elastic properties of mono- layer h-BN through ab initio density functional theory. This thermodynamically rigorous contin- uum description of the elastic response is formulated by expanding the elastic strain energy density in a Taylor series in strain truncated after the fifth-order term. we obtained a total of fourteen nonzero independent elastic constants for the up to tenth-order tensor. We predicted the pressure dependent second-order elastic moduli. This continuum formulation is suitable for incorporation into the finite element method.

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