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On the phase velocity simulation of the multi curved viscoelastic system via an exact solution framework
Engineering with Computers Pub Date : 2020-09-03 , DOI: 10.1007/s00366-020-01152-2
M. S. H. Al-Furjan , Masoud Mohammadgholiha , Ibrahim M. Alarifi , Mostafa Habibi , Hamed Safarpour

The analysis of the wave propagation behavior of a sandwich structure with a soft core and multi-hybrid nanocomposite (MHC) face sheets is carried out in the framework of the higher-order shear deformation theory (HSDT). In order to take into account the viscoelastic influence, the Kelvin-Voight model is presented. In this paper, the constituent material of the core is made of an epoxy matrix which is reinforced by both macro- and nano-size reinforcements, namely carbon fiber (CF) and carbon nanotube (CNT). The effective material properties like Young's modulus or density are derived utilizing a micromechanical scheme incorporated with the Halpin–Tsai model. Then, on the basis of an energy-based Hamiltonian approach, the equations of motion are derived. The detailed parametric study is conducted, focusing on the combined effects of the viscoelastic foundation, CNT' weight fraction, core to total thickness ratio, small radius to total thickness ratio, and carbon fiber angle on the wave propagation behavior of sandwich structure. The results show that as well as increasing the phase velocity of the sandwich structure by increasing the wave number, this influence will be much more effective by increasing the damping factor. It is also observed that there is a critical value for the viscoelastic foundation that the relation between wave number and phase velocity will change from direct to indirect. The presented study outputs can be used in ultrasonic inspection techniques and structural health monitoring.

中文翻译:

基于精确求解框架的多曲线粘弹性系统相速度模拟

在高阶剪切变形理论 (HSDT) 的框架内,对具有软芯和多杂化纳米复合材料 (MHC) 面板的夹层结构的波传播行为进行了分析。为了考虑粘弹性影响,提出了 Kelvin-Voight 模型。在本文中,核心的组成材料由环氧树脂基体制成,该基体通过宏观和纳米尺寸的增强材料,即碳纤维 (CF) 和碳纳米管 (CNT) 进行增强。杨氏模量或密度等有效材料特性是利用与 Halpin-Tsai 模型结合的微机械方案推导出来的。然后,在基于能量的哈密顿方法的基础上,推导出运动方程。进行了详细的参数研究,重点关注粘弹性基础、碳纳米管的重量分数、核心与总厚度比、小半径与总厚度比以及碳纤维角度对夹层结构波传播行为的综合影响。结果表明,除了通过增加波数来增加夹层结构的相速度外,通过增加阻尼因子,这种影响也会更加有效。还观察到,粘弹性基础存在一个临界值,即波数与相速度之间的关系将从直接变为间接。所提出的研究输出可用于超声波检测技术和结构健康监测。和碳纤维角度对夹层结构波传播行为的影响。结果表明,除了通过增加波数来增加夹层结构的相速度外,通过增加阻尼因子,这种影响也会更加有效。还观察到,粘弹性基础存在一个临界值,即波数与相速度之间的关系将从直接变为间接。所提出的研究输出可用于超声波检测技术和结构健康监测。和碳纤维角度对夹层结构波传播行为的影响。结果表明,除了通过增加波数来增加夹层结构的相速度外,通过增加阻尼因子,这种影响也会更加有效。还观察到,粘弹性基础存在一个临界值,即波数与相速度之间的关系将从直接变为间接。所提出的研究输出可用于超声波检测技术和结构健康监测。还观察到,粘弹性基础存在一个临界值,即波数与相速度之间的关系将从直接变为间接。所提出的研究输出可用于超声波检测技术和结构健康监测。还观察到,粘弹性基础存在一个临界值,即波数与相速度之间的关系将从直接变为间接。所提出的研究输出可用于超声波检测技术和结构健康监测。
更新日期:2020-09-03
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