Size-dependent elasticity of nanowires: Nonlinear effects
Size-dependent elasticity of nanowires: Nonlinear effects
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DOI：
10.1103/physrevb.71.241403
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发表时间：
2005-06-01
影响因子：
3.7
通讯作者：
Huang, HC
中科院分区：
文献类型：
--
作者：
Liang, HY;Upmanyu, M;Huang, HC
我们采用基于嵌入原子方法的原子间相互作用势的分子静力学方法研究了铜纳米线沿着[001]、[110]和[111]晶向的弹性。与体响应的自洽比较清楚地表明，整体纳米线弹性主要是由于纳米线芯的非线性响应。虽然表面应力引起的表面弹性修改的行为，但它们的贡献总是远远小于由于纳米线芯的非线性弹性。更重要的是，对于所有三个方向，表面比等效应变块体更软，并且整体纳米线软化或硬化由依赖于方向的芯弹性决定。
We employ a molecular statics approach based on embedded-atom-method interatomic potentials to study the elasticity of copper nanowires along [001], [110], and [111] crystallographic directions. Self-consistent comparison with the bulk response clearly shows that the overall nanowire elasticity is primarily due to nonlinear response of the nanowire core. While the surface-stress-induced surface elasticity modifies the behavior for ultrathin nanowires, their contribution is always considerably smaller than that due to nonlinear elasticity of the nanowire core. More importantly, for all three orientations, the surface is softer than an equivalently strained bulk, and the overall nanowire softening or stiffening is determined by orientation-dependent core elasticity.