Free vibration analysis of rotating sandwich panels with carbon nanotubes reinforced face sheets and honeycomb core in thermal environments using finite element method

Debarshi Biswas, Tripuresh Deb Singha, Tanmoy Bandyopadhyay
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Abstract

The present work investigates the free vibration response of rotating sandwich panels comprising nanoparticle-reinforced face sheets and a metallic honeycomb core using the finite element method (FEM). The honeycomb core is either re-entrant or non-re-entrant, while the composite face sheets are made of poly-methyl methacrylate (PMMA) matrix reinforced by carbon nanotubes (CNTs). The deformations of the sandwich panel are modelled using a higher-order shear deformation theory (HSDT), considering seven degrees of freedom at each node. The effective properties of the CNTs reinforced face sheets depend on the working temperature and CNTs grading pattern and are evaluated with the help of the extended rule of mixture (EROM). The titanium alloy-based metallic honeycomb core properties depend on the inclination angle and rib-thickness ratio. The work considers the influence of crucial parameters like inclined angle, rib-thickness ratio, pre-twist angle, panel aspect ratio, core-to-face sheet thickness ratio, rotational speed and hub radius. A decrease in the natural frequency is observed with an increase in the honeycomb angle, while the reverse trend occurs with an increase in the rib-thickness ratio of the honeycomb core. An increase in the rotational speed and hub radius increases the natural frequencies irrespective of the CNTs distribution pattern. Also, the analysis involves plotting the mode shapes at different honeycomb angles. The first mode shape indicates the first bending for higher values of the auxetic angles, while it is the first twist mode at lower values.
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用有限元法分析热环境下带有碳纳米管增强面片和蜂窝芯的旋转夹层板的自由振动
本研究采用有限元法(FEM)研究了由纳米粒子增强面片和金属蜂窝芯组成的旋转夹层板的自由振动响应。蜂窝芯为重入式或非重入式,而复合面片由碳纳米管(CNT)增强的聚甲基丙烯酸甲酯(PMMA)基体制成。夹层板的变形采用高阶剪切变形理论(HSDT)建模,考虑了每个节点的七个自由度。CNTs 增强面片的有效特性取决于工作温度和 CNTs 分级模式,并借助扩展混合规则 (EROM) 进行了评估。钛合金基金属蜂窝芯的性能取决于倾斜角和肋厚比。该研究考虑了倾斜角、肋厚比、预扭角、面板长宽比、芯材与面材厚度比、旋转速度和轮毂半径等关键参数的影响。随着蜂窝角度的增大,固有频率会降低,而随着蜂窝芯肋厚比的增大,则会出现相反的趋势。无论碳纳米管的分布模式如何,转速和轮毂半径的增加都会提高固有频率。此外,分析还包括绘制不同蜂窝角度下的模态振型。在辅助角度值较高时,第一模态形状表示第一弯曲模态,而在辅助角度值较低时,则表示第一扭曲模态。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
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来源期刊
CiteScore
4.70
自引率
8.30%
发文量
166
审稿时长
3 months
期刊介绍: The Journal of Materials: Design and Applications covers the usage and design of materials for application in an engineering context. The materials covered include metals, ceramics, and composites, as well as engineering polymers. "The Journal of Materials Design and Applications is dedicated to publishing papers of the highest quality, in a timely fashion, covering a variety of important areas in materials technology. The Journal''s publishers have a wealth of publishing expertise and ensure that authors are given exemplary service. Every attention is given to publishing the papers as quickly as possible. The Journal has an excellent international reputation, with a corresponding international Editorial Board from a large number of different materials areas and disciplines advising the Editor." Professor Bill Banks - University of Strathclyde, UK This journal is a member of the Committee on Publication Ethics (COPE).
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