Effect of Waviness on the Dynamic Characteristics of Double Walled Carbon Nanotubes
Effect of Waviness on the Dynamic Characteristics of Double Walled Carbon Nanotubes
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DOI：
10.1166/nnl.2014.1720
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发表时间：
2014
影响因子：
--
通讯作者：
Ajay M. Patel;A. Joshi
中科院分区：
文献类型：
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作者：
Ajay M. Patel;A. Joshi
对双壁碳纳米管的振动和动力学性质进行了大量的研究。在大多数研究中，DWCNT都被假定为直的。然而，从实验图像中发现，这些纳米管不是直的，并且沿着其轴具有显著量的表面偏差或波纹。本文研究了双壁碳纳米管的振动分析，将表面偏差视为波纹度。波度沿着轴的影响已被评估，通过使纳米管的不同的边界条件，即桥接，悬臂和简支和直和波状DWCNTs的振动响应进行了研究。碳纳米管的波度被建模为具有小上升函数的正弦曲率，并且被认为是在外部以及内部纳米管。动态特性的研究，使用连续介质力学为基础的方法，以及有限元模型。所得到的结果与实验和其他现有的文献进行了验证。结果表明，在不同的边界条件下，双壁碳纳米管对波度沿着的敏感性。与其他理论研究的比较表明，在基本频率方面有很好的相关性。目前，关于双壁碳纳米管中的波纹度的信息非常少。因此，这项调查是有帮助的，在涉及提高频率的振荡器和纳米传感器的机电设备的基础上，通常被建模为直的和波纹的影响是不考虑的应用。
A no. of studies have been performed to evaluate the vibrational and dynamic properties of Double walled carbon nanotubes (DWCNTs). In mostly all the studies DWCNTs have been assumed to be straight. However from experimental images it has been found that these nanotubes are not straight and have a significant amount of surface deviation or waviness along its axis. This paper deals with the vibration analysis of double walled carbon nanotubes having surface deviations considered as waviness. The effect of waviness along the axis has been evaluated by subjecting the nanotube to different boundary conditions namely bridged, cantilever and simply supported and the vibration responses of straight and wavy DWCNTs are investigated. The waviness of the carbon nanotubes is modeled as a sinusoidal curvature with small rise function and is considered in the outer as well as the inner nanotubes. The dynamic characteristics are studied using a continuum mechanics based approach as well as the Finite Element Model. The results obtained are validated with the experimental and others existing in the literature. The results show the sensitivity of Double walled carbon nanotube to waviness along with different boundary conditions. Comparison with other theoretical studies reveals very good correlations in terms of the fundamental frequencies. Currently very less information is available regarding the waviness in double walled carbon nanotubes. Hence, this investigation is helpful in the applications involving elevated frequency oscillators and nanosensors based on electromechanical devices which are generally modeled as straight and the effect of waviness is not considered.