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Hygrothermal effect on vibration of magnetostrictive viscoelastic sandwich plates supported by Pasternak's foundations
Thin-Walled Structures ( IF 6.4 ) Pub Date : 2020-09-19 , DOI: 10.1016/j.tws.2020.107007
Ashraf M. Zenkour , Hela D. El-Shahrany

In hygrothermal environment, vibration study of a simply supported smart sandwich plate embedded in an elastic substrate medium is presented in the present article. The sandwich plate contains layers of fiber-reinforced and magnetostrictive materials and core of viscoelastic material. The kinematic equations system is derived via employing Hamilton's principle with considering the transverse shear strains with and without the normal strains effect. Various numerical examples are carried out to study the effects of temperature rise, degree of moisture concentration, elastic foundations parameters, thickness ratio, aspect ratio, thickness ratio of magnetostrictive layer to viscoelastic layer, modes, lamination schemes, magnitude of the feedback coefficient, position of the magnetostrictive layers and viscoelastic structural damping coefficient on controlled motion and vibration characteristics of plate. Some observation about influences of the temperature and humidity concentrations on vibration characteristics of studied plate are presented in detail. The outcomes indicate that the hygrothermal environments have negative effects on vibration suppression of advanced composite structures especially the uniform hygrothermal distribution. The frequencies increase with increasing the viscoelastic structural damping coefficient and the foundation constants.



中文翻译:

湿热对巴斯德纳克基础支撑的磁致伸缩粘弹性夹芯板振动的影响

在湿热环境下,本文介绍了嵌入弹性基底介质中的简单支撑智能夹心板的振动研究。夹层板包含纤维增强和磁致伸缩材料层以及粘弹性材料层。运动方程组是通过采用汉密尔顿原理并考虑有和没有正应变作用的横向剪切应变而得出的。进行了各种数值示例来研究温度升高,水分含量,弹性基础参数,厚度比,纵横比,磁致伸缩层与粘弹性层的厚度比,模式,叠片方案,反馈系数的大小,磁致伸缩层的位置和粘弹性结构阻尼系数对板的受控运动和振动特性的影响。详细介绍了温度和湿度浓度对被研究板振动特性的一些影响。结果表明,湿热环境对高级复合结构的振动抑制有负面影响,尤其是均匀的湿热分布。频率随着粘弹性结构阻尼系数和基础常数的增加而增加。结果表明,湿热环境对高级复合结构的振动抑制有负面影响,尤其是均匀的湿热分布。频率随着粘弹性结构阻尼系数和基础常数的增加而增加。结果表明,湿热环境对高级复合结构的振动抑制有负面影响,尤其是均匀的湿热分布。频率随着粘弹性结构阻尼系数和基础常数的增加而增加。

更新日期:2020-09-20
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