Forced vibration analysis of a micro sandwich plate with an isotropic/orthotropic cores and polymeric nanocomposite face sheets

IF 2.9 4区工程技术 Q2 COMPUTER SCIENCE, INTERDISCIPLINARY APPLICATIONS Computers and Concrete Pub Date : 2021-09-01 DOI:10.12989/CAC.2021.28.3.259

J. Rajabi, M. Mohammadimehr

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Abstract

In this study, the forced vibration analysis of a micro sandwich plate with an isotropic/orthotropic cores and polymeric nanocomposite face sheets is taken into account based on first order shear deformation theory (FSDT). The core of this plate is considered as five isotropic Devineycell materials (H30, H45, H60, H100 and H200) and an orthotropic material, while facesheets layers are as polymeric matrix reinforced by carbon nanotubes under temperature-dependent and hydro material properties on the elastic foundations. The governing equations of motion are derived using the Hamilton's principle and then solved by analytical method. Also, the effects of different parameters such as size dependent, side ratio, volume fraction, various material properties of cores and facesheets and temperature and humidity changes on the dimensionless frequency are investigated. It is shown from the results that the dimensionless frequency for CT is lower than that of for MSGT. Also, it is presented that the least amplitude oscillation is related to the modified strain gradient theory due to higher stiffen. It is illustrated that the dimensionless frequency for Devineycell H200 is highest and lowest for H30. The results of this research can be used in aircraft, automotive, shipbuilding industries and biomedicine.

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具有各向同性/正交异性芯和高分子纳米复合材料面片的微夹心板的强迫振动分析

基于一阶剪切变形理论(FSDT)，对具有各向同性/正交异性核芯和高分子纳米复合材料面片的微夹层板进行了强迫振动分析。该板的核心被认为是五种各向同性的Devineycell材料(H30, H45, H60, H100和H200)和一种正交各向异性材料，而面板层是碳纳米管增强的聚合物基体，在弹性基础上具有温度依赖和水材料特性。利用哈密顿原理推导出运动控制方程，并用解析法求解。此外，还研究了尺寸依赖性、边长比、体积分数、芯材和面材的各种材料特性以及温度和湿度变化等参数对无量纲频率的影响。结果表明，CT的无量纲频率低于MSGT的无量纲频率。此外，由于刚度较高，最小振幅振荡与修正应变梯度理论有关。结果表明，Devineycell H200的无因次频率最高，H30的无因次频率最低。该研究成果可应用于飞机、汽车、造船、生物医药等行业。

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来源期刊

Computers and Concrete 工程技术-材料科学：表征与测试

CiteScore

8.60

自引率

7.30%

发文量

审稿时长

13.5 months

期刊介绍： Computers and Concrete is An International Journal that focuses on the computer applications in be considered suitable for publication in the journal. The journal covers the topics related to computational mechanics of concrete and modeling of concrete structures including plasticity fracture mechanics creep thermo-mechanics dynamic effects reliability and safety concepts automated design procedures stochastic mechanics performance under extreme conditions.