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Contribution of nonlocality to surface elasticity
International Journal of Engineering Science ( IF 6.6 ) Pub Date : 2020-05-11 , DOI: 10.1016/j.ijengsci.2020.103311
Li Li , Rongming Lin , Teng Yong Ng

The underlying mechanisms of surface phenomena are very complex and still not entirely clear. The aim of this work attempts to reveal the important contribution of the nonlocal integral theory of elasticity to surface elasticity, which is of fundamental scientific interest. By considering a uniform and isotropic half-space medium subjected to an arbitrary uniform strain, it is shown that the bulk is homogeneous, however, the whole medium is heterogeneous due to the bond loss near the free surface. The nonlocal effect cannot be observed at all in the homogeneous bulk, but the bond loss characterized by the nonlocal integral theory can show an important contribution to the surface elasticity. This in turn allows to propose a simplified surface model to replace the complex modeling of nonlocal integral theory. The thickness of surface zone can be evaluated from the intrinsic characteristic length used in the nonlocal integral theory. According to the intrinsic correlation and using the molecular dynamics simulations, the thickness of the surface layer of silicon films is 2.6911 Å. Furthermore, with application of the simplified surface model to a thin film in tension, it has been noted that the geometric dimension of size-dependence is generally not that of traditional mechanics. For instance, in most situations, the main contribution to size-dependence has actually come from the thickness (or radius) direction of a rod-type structure, rather than its axial direction which is intuitively- and widely-used in the current practice in open literature.



中文翻译:

非局部性对表面弹性的贡献

表面现象的潜在机制非常复杂,但仍不完全清楚。这项工作的目的是试图揭示弹性的非局部积分理论对表面弹性的重要贡献,这具有根本的科学意义。通过考虑均匀且各向同性的半空间介质承受任意均匀的应变,可以看出整体是均匀的,但是,由于自由表面附近的键损失,整个介质是异质的。在均匀的体积中根本无法观察到非局部效应,但是以非局部积分理论为特征的键损可以显示出对表面弹性的重要贡献。反过来,这允许提出一个简化的表面模型来代替非局部积分理论的复杂模型。可以从非局部积分理论中使用的固有特征长度来评估表​​面区域的厚度。根据本征相关性并使用分子动力学模拟,硅膜表面层的厚度为2.6911。此外,通过将简化的表面模型施加到张力下的薄膜,已经注意到,尺寸依赖性的几何尺寸通常不是传统力学的几何尺寸。例如,在大多数情况下,对尺寸依赖性的主要贡献实际上来自于杆状结构的厚度(或半径)方向,而不是其在当前实践中直观且广泛使用的轴向。开放文学。根据本征相关性并使用分子动力学模拟,硅膜表面层的厚度为2.6911。此外,通过将简化的表面模型施加到张力下的薄膜,已经注意到,尺寸依赖性的几何尺寸通常不是传统力学的几何尺寸。例如,在大多数情况下,对尺寸依赖性的主要贡献实际上来自于杆状结构的厚度(或半径)方向,而不是其在当前实践中直观且广泛使用的轴向。开放文学。根据本征相关性并使用分子动力学模拟,硅膜表面层的厚度为2.6911。此外,通过将简化的表面模型施加到张力下的薄膜上,已经注意到,尺寸依赖性的几何尺寸通常不是传统力学的几何尺寸。例如,在大多数情况下,对尺寸依赖性的主要贡献实际上来自于杆状结构的厚度(或半径)方向,而不是其在当前实践中直观且广泛使用的轴向。开放文学。已经注意到,尺寸依赖性的几何尺寸通常不是传统力学的尺寸。例如,在大多数情况下,对尺寸依赖性的主要贡献实际上来自于杆状结构的厚度(或半径)方向,而不是其在当前实践中直观且广泛使用的轴向。开放文学。已经注意到,尺寸依赖性的几何尺寸通常不是传统力学的尺寸。例如,在大多数情况下,对尺寸依赖性的主要贡献实际上来自于杆状结构的厚度(或半径)方向,而不是其在当前实践中直观且广泛使用的轴向。开放文学。

更新日期:2020-05-11
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