Size effect of the elastic modulus of rectangular nanobeams：Surface elasticity effect

doi:10.1088/1674-1056/22/10/106201

Abstract The size-dependent elastic property of rectangular nanobeams (nanowires or nanoplates) induced by the surface elasticity effect is investigated by using a developed modified core-shell model. The effect of surface elasticity on the elastic modulus of nanobeams can be characterized by two surface related parameters, i.e., inhomogeneous degree constant and surface layer thickness. The analytical results show that the elastic modulus of the rectangular nanobeam exhibits a distinct size effect when its characteristic size reduces below 100 nm. It is also found that the theoretical results calculated by a modified core-shell model have more obvious advantages than those by other models (core-shell model and core-surface model) by comparing them with relevant experimental measurements and computational results, especially when the dimensions of nanostructures reduce to a few tens of nanometers.

Keywords: size effects elastic modulus nanobeams surface elasticity

Received: 13 January 2013
Revised: 20 March 2013
Accepted manuscript online:

PACS:	62.20.-x	(Mechanical properties of solids)
	62.20.de	(Elastic moduli)
	62.23.Hj	(Nanowires)
	62.25.-g	(Mechanical properties of nanoscale systems)

Fund: Project supported by the National Natural Science Foundation of China (Grant No. 11072104) and the Scientific Research Program for Higher Schools of Inner Mongolia (Grant No. NJZY13013).

Corresponding Authors: Yun Guo-Hong
E-mail: ndghyun@imu.edu.cn, ghyun@imnu.edu.cn

Cite this article:

Yao Hai-Yan (姚海燕), Yun Guo-Hong (云国宏), Fan Wen-Liang (范文亮) Size effect of the elastic modulus of rectangular nanobeams：Surface elasticity effect 2013 Chin. Phys. B 22 106201

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