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首页> 外文期刊>Journal of the Brazilian Society of Mechanical Sciences and Engineering >Wave propagation characteristics of the electrically GNP-reinforced nanocomposite cylindrical shell
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Wave propagation characteristics of the electrically GNP-reinforced nanocomposite cylindrical shell

机译：GNP电增强纳米复合圆柱壳的波传播特性

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In this article, wave propagation characteristics of a size-dependent graphene nanoplatelet (GNP) reinforced composite cylindrical nanoshell coupled with piezoelectric actuator (PIAC) and surrounded with viscoelastic foundation is presented. The effects of small scale are analyzed based on nonlocal strain gradient theory (NSGT) which is an accurate theory employing exact length scale parameter and nonlocal constant. The governing equations of the GNP composite cylindrical nanoshell coupled with PIAC have been evolved using Hamilton’s principle and solved with assistance of the analytical method. For the first time in the current study, wave propagation electrical behavior of a GNP composite cylindrical nanoshell coupled with PIAC based on NSGT is examined. The results show that, by decreasing the PIAC thickness, extremum values of phase velocity occur in the lower values of the wave number. Another important result is that, by increasing GPL%, the effects of PIAC thickness on the phase velocity decrease. Finally, influence of PIAC thickness, wave number, applied voltage, and different GPL distribution patterns on phase velocity is investigated using mentioned continuum mechanics theory. Useful suggestion of this research is that for designing of a nanostructure coupled with PIAC attention should be given to PIAC thickness and applied voltage, simultaneously. The outputs of the current study can be used in the structural health monitoring and ultrasonic inspection techniques.
机译：在本文中，提出了与压电致动器（PIAC）耦合并被粘弹性基础包围的尺寸依赖性石墨烯纳米片（GNP）增强复合圆柱形纳米壳的波传播特性。基于非局部应变梯度理论（NSGT）分析了小尺度的影响，NSGT是使用精确长度尺度参数和非局部常数的精确理论。利用汉密尔顿原理推导了GNP复合圆柱纳米壳与PIAC的控制方程，并借助分析方法进行了求解。在本研究中，首次研究了基于NSGT的GNP复合圆柱形纳米壳与PIAC耦合的波传播电性能。结果表明，通过减小PIAC厚度，相速度的极值出现在波数的较低值中。另一个重要结果是，通过增加GPL％，PIAC厚度对相速度的影响会降低。最后，利用所提到的连续力学原理，研究了PIAC厚度，波数，施加电压以及不同的GPL分布模式对相速度的影响。这项研究的有用建议是，在设计与PIAC耦合的纳米结构时，应同时注意PIAC的厚度和施加的电压。当前研究的结果可用于结构健康监测和超声检查技术。

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