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Free and Forced Vibration Characteristics of CNT Reinforced Composite Spherical Sandwich Shell Panels with MR Elastomer Core
International Journal of Structural Stability and Dynamics ( IF 3.6 ) Pub Date : 2021-06-05 , DOI: 10.1142/s0219455421501364
Mageshwaran Subramani 1 , Manoharan Ramamoorthy 1 , Ananda Babu Arumugam 2 , Rajeshkumar Selvaraj 1
Affiliation  

In this work, the dynamic behavior of the spherical magnetorheological elastomer (MRE) sandwich shell panel with multiwalled carbon nanotubes (MWCNT) reinforced composite face sheets is studied. The governing differential equation of motion for the (doubly curved) spherical sandwich shell panel is derived based on the Higher-Order Shear Deformation Theory (HSDT) kinematics. In the finite element framework, nine noded iso-parametric elements with nine Degrees of Freedom (DOFs) at each node are considered for solving the numerical problem. The finite element model of the multifunctional MR elastomer core spherical sandwich shell panel is validated against the existing works in terms of natural frequencies on different boundary conditions and magnetic field environment. The influence of MWCNT in the face sheet of the MR elastomer spherical sandwich shell panel is also studied through the structural rigidity. Detailed parametric investigations are performed to study the stiffness and damping characteristics of the shell panel with respect to the magnetic field intensities, thickness ratio, aspect ratio, ply orientation, and boundary conditions on the multifunctional MR elastomer core spherical sandwich shell panel. Also, the transverse vibration study of the MWCNT reinforced spherical sandwich shell with MR elastomer is carried out for different magnetic field intensities and curvatures to assess their effects on the structural performance. This study shows the applicability of the MR elastomer in sandwich shell structure for control of vibration and damping.

中文翻译:

具有MR弹性体芯的CNT增强复合球形夹心壳板的自由和受迫振动特性

在这项工作中,研究了具有多壁碳纳米管(MWCNT)增强复合面板的球形磁流变弹性体(MRE)夹心壳板的动态行为。基于高阶剪切变形理论 (HSDT) 运动学推导出(双曲)球形夹芯壳板的运动控制微分方程。在有限元框架中,考虑了在每个节点处具有九个自由度 (DOF) 的九个节点等参数单元来解决数值问题。在不同边界条件和磁场环境下的固有频率方面,针对现有工作对多功能MR弹性体芯球面夹芯壳板的有限元模型进行了验证。还通过结构刚度研究了多壁碳纳米管对MR弹性体球形夹芯壳面板面板的影响。进行详细的参数研究以研究外壳面板的刚度和阻尼特性,这些特性与多功能 MR 弹性体芯球形夹芯壳面板上的磁场强度、厚度比、纵横比、层片取向和边界条件有关。此外,针对不同的磁场强度和曲率,对具有 MR 弹性体的 MWCNT 增强球形夹层壳进行横向振动研究,以评估它们对结构性能的影响。本研究表明 MR 弹性体在夹层壳结构中用于控制振动和阻尼的适用性。
更新日期:2021-06-05
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