基于有限差分法考虑表面能效应的非局部二变量精炼板理论的正交各向异性石墨烯片的热机械振动、屈曲和弯曲

IF 4.2 Q2 NANOSCIENCE & NANOTECHNOLOGY
M. Karimi, A. Shahidi
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引用次数: 33

摘要

本文研究了温度变化对嵌入弹性介质中的正交异性石墨烯片的振动、屈曲和弯曲的影响,包括表面能和小尺度效应。为了考虑小尺度和表面能效应,分别采用了Eringen的非局部本构关系和Gurtin和Murdoch的表面弹性理论。利用Hamilton原理,利用两变量精细化板理论推导了正交各向异性纳米板体积和表面的控制方程。采用有限差分法求解控制方程。得到的结果用Navier的方法和文献报道的验证结果进行了验证。结果表明,对于各向同性和正交异性材料性能,随着温度变化的增加,表面效应对纳米板屈曲和振动的影响程度在高温下增强,在低温下减弱。此外,表面和温度变化对各向同性材料屈曲和振动的影响比正交各向异性材料更明显。相反,对于弯曲问题,这些结果完全相反。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Thermo-mechanical vibration, buckling, and bending of orthotropic graphene sheets based on nonlocal two-variable refined plate theory using finite difference method considering surface energy effects
In this article, the influence of temperature change on the vibration, buckling, and bending of orthotropic graphene sheets embedded in elastic media including surface energy and small-scale effects is investigated. To take into account the small-scale and surface energy effects, the nonlocal constitutive relations of Eringen and surface elasticity theory of Gurtin and Murdoch are used, respectively. Using Hamilton’s principle, the governing equations for bulk and surface of orthotropic nanoplate are derived using two-variable refined plate theory. Finite difference method is used to solve governing equations. The obtained results are verified with Navier’s method and validated results reported in the literature. The results demonstrated that for both isotropic and orthotropic material properties, by increasing the temperature changes, the degree of surface effects on the buckling and vibration of nanoplates could enhance at higher temperatures, while it would diminish at lower temperatures. In addition, the effects of surface and temperature changes on the buckling and vibration for isotropic material property are more noticeable than those of orthotropic. On the contrary, these results are totally reverse for bending problem.
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来源期刊
CiteScore
6.00
自引率
1.70%
发文量
24
期刊介绍: Proceedings of the Institution of Mechanical Engineers Part N-Journal of Nanomaterials Nanoengineering and Nanosystems is a peer-reviewed scientific journal published since 2004 by SAGE Publications on behalf of the Institution of Mechanical Engineers. The journal focuses on research in the field of nanoengineering, nanoscience and nanotechnology and aims to publish high quality academic papers in this field. In addition, the journal is indexed in several reputable academic databases and abstracting services, including Scopus, Compendex, and CSA's Advanced Polymers Abstracts, Composites Industry Abstracts, and Earthquake Engineering Abstracts.
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