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Hygrothermal vibration of adaptive composite magnetostrictive laminates supported by elastic substrate medium
European Journal of Mechanics - A/Solids ( IF 4.1 ) Pub Date : 2020-10-08 , DOI: 10.1016/j.euromechsol.2020.104140
Ashraf M. Zenkour , Hela D. El-Shahrany

Vibration of a simply supported rectangular composite laminated plate with four actuating magnetostrictive layers is analyzed in the current study. The studied plate is supported by the two-parameter elastic (Pasternak's) foundations and subjected to a hygrothermal environment. Hamilton's principle and five theories are utilized to derive the kinematic equations considering the transverse shear strain with/without the transverse normal strain. The effects due to modes, lamination schemes, elastic foundations parameters, the magnitude of the feedback coefficient, position of the magnetostrictive layers, temperature rise, the degree of moisture concentration on the damping coefficients, damped natural frequencies, maximum deflection, vibration time and damping ratio, are investigated. Some conclusions about the effect of the temperature and moisture concentrations on the vibration behavior of the plate are formulated. The outcomes refer to that increasing the intelligent actuating layers in the advanced plates improves the vibration damping process, but also the position of these layers plays an effective role in reduction the time interval of damping and improving the vibration damping characteristics. Also, hygrothermal conditions reduce the ability of smart components to suppress the vibration of structures.



中文翻译:

弹性基底介质支撑的自适应复合磁致伸缩层压板的湿热振动

在当前研究中,分析了具有四个致动磁致伸缩层的简单支撑的矩形复合层压板的振动。所研究的板块由两参数弹性(Pasternak's)基础支撑,并处于湿热环境下。利用汉密尔顿原理和五种理论推导了考虑有/没有横向法向应变的横​​向剪切应变的运动学方程。由于模式,叠片方案,弹性基础参数,反馈系数的大小,磁致伸缩层的位置,温度升高,湿气浓度对阻尼系数的影响,固有频率的阻尼,最大挠度,振动时间和阻尼的影响比率,进行调查。提出了关于温度和水分浓度对板的振动行为的影响的一些结论。结果表明,在高级板中增加智能执行机构层可改善减振过程,但这些层的位置也可有效减少阻尼时间间隔并改善减振特性。而且,湿热条件会降低智能组件抑制结构振动的能力。而且这些层的位置在减少阻尼的时间间隔和改善振动阻尼特性方面也起着有效的作用。而且,湿热条件会降低智能组件抑制结构振动的能力。而且这些层的位置在减少阻尼的时间间隔和改善振动阻尼特性方面也起着有效的作用。而且,湿热条件会降低智能组件抑制结构振动的能力。

更新日期:2020-10-13
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