Surface effect on the resonant frequency of Timoshenko nanobeams

doi:10.1016/j.ijmecsci.2017.07.052

CORC > 力学研究所 > 中国科学院力学研究所 > 非线性力学国家重点实验室

	Surface effect on the resonant frequency of Timoshenko nanobeams
	Jia N(贾宁); Yao Y(姚寅); Yang YZ(杨亚政); Chen SH(陈少华); Chen, SH (reprint author), Beijing Inst Technol, Beijing 100081, Peoples R China.
刊名	INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES
	2017-11-01
卷号	133 页码:21-27
关键词	Timoshenko Nanobeam Resonant Frequency Surface Effect Shear Deformation Effect Rotary Inertia Effect
ISSN号	0020-7403
DOI	10.1016/j.ijmecsci.2017.07.052
文献子类	Article
英文摘要	The dynamic behavior of a Timoshenko nanobeam would be significantly different from a macro-one due to the large ratio of surface area to volume of nanomaterials. Furthermore, the shear deformation effect would be obvious for a Timoshenko nanobeam in contrast to an Eulerian one. In this paper, a recently developed elastic theory is adopted in order to predict the resonant frequency of a Timoshenko nanobeam, in which not only the surface effect but also the shear deformation effect and the rotary inertia one are considered. In contrast to the existing surface effect theories, surface effect of nanomaterials is characterized by the surface energy density in the adopted theory. The resonant frequency of both a fixed-fixed nanobeam and a cantilevered one is analyzed. It is found that the dynamic behavior of nanobeams deviates significantly from the one predicted by both the classical Timoshenko beam theory and the Euler-Bernoulli one due to the surface effect. Furthermore, the shear deformation effect and the rotary inertia effect cannot be neglected in nanobeams with a relative small aspect ratio, which cannot be precisely characterized by the Euler-Bernoulli beam theory. In addition, the influencing mechanism of surface effect on the dynamic behavior of nanobeams would depend on the boundary conditions. The resonant frequency of a fixed-fixed Timoshenko nanobeam would be improved, while that of a cantilevered one would be weakened by the surface effect in contrast to the corresponding classical solutions. The results in this paper should be useful for precise design of nano-devices and helpful for reasonable assessment of test results of nano-instruments. (C) 2017 Elsevier Ltd. All rights reserved.
分类号	一类
WOS关键词	BEAM MODEL ; ELASTIC PROPERTIES ; NANOWIRES ; STRESS ; ENERGY ; BEHAVIOR ; SILICON
WOS研究方向	Engineering ; Mechanics
语种	英语
WOS记录号	WOS:000415770300003
资助机构	National Natural Science Foundation of China(11532013 ; BIT Creative Research Plan ; Project of Beijing Municipal Science and Technology Commission(Z161100001416007) ; Project of State Key Laboratory of Explosion Science and Technology(ZDKT17-02) ; 11372317 ; 11402270)
内容类型	期刊论文
源URL	[http://dspace.imech.ac.cn/handle/311007/71939]
专题	力学研究所_非线性力学国家重点实验室
通讯作者	Chen, SH (reprint author), Beijing Inst Technol, Beijing 100081, Peoples R China.
推荐引用方式 GB/T 7714	Jia N,Yao Y,Yang YZ,et al. Surface effect on the resonant frequency of Timoshenko nanobeams[J]. INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES,2017,133:21-27.
APA	贾宁,姚寅,杨亚政,陈少华,&Chen, SH .(2017).Surface effect on the resonant frequency of Timoshenko nanobeams.INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES,133,21-27.
MLA	贾宁,et al."Surface effect on the resonant frequency of Timoshenko nanobeams".INTERNATIONAL JOURNAL OF MECHANICAL SCIENCES 133(2017):21-27.