Damping and instability characteristics of uniform and non-uniform composite multifunctional semi-active sandwich structures under rotating environment

In the present study, vibration and instability characteristics of the rotating carbon nanotubes (CNT) reinforced magnetorheological (MR) elastomer embedded sandwich composite plate with uniform and non-uniform composite face sheets under in-plane loading have been investigated numerically using fin...

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Bibliographic Details
Published in:Composites science and technology 2022-03, Vol.219, p.109203, Article 109203
Main Authors: Arumugam, Ananda Babu, Selvaraj, Rajeshkumar, Subramani, Mageshwaran, Vemuluri, Ramesh Babu
Format: Article
Language:English
Subjects:
Active damping
Carbon nanotubes
CNT reinforcement
Composite materials
Composite structures
Damping
Elastomers
Finite element analysis
Finite element method
Instability
Magnetic fields
Mathematical analysis
Nanotubes
Resonant frequencies
Rotating environments
Sandwich plate
Sandwich structures
Semiactive damping
Smart core
Stiffness
Vibration
Vibration and damping
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Summary:In the present study, vibration and instability characteristics of the rotating carbon nanotubes (CNT) reinforced magnetorheological (MR) elastomer embedded sandwich composite plate with uniform and non-uniform composite face sheets under in-plane loading have been investigated numerically using finite element (FE) method. The efficacy of the FE method by deriving the governing equations using higher order theory is verified by comparing the natural frequencies assessed using experimental studies on the MR elastomer and CNT reinforced MR elastomer sandwich composite structures under different rotational speeds. This research also predicts the effects of CNT and magnetic fields on material damping, as well as rotating effects on structural damping due to geometrical non-linearity, in terms of natural frequencies and their corresponding modal loss factors of uniform and non-uniform multifunctional smart sandwich composite plates. Further, the instability regions of the uniform and non-uniform multifunctional smart sandwich plates under in-plane periodic load are analysed with the influence of various rotating speeds and magnetic field intensities. Therefore, it could be concluded that the CNT reinforcement on the MR elastomer layer significantly improves the stiffness, damping and reduces the instability regions of spectra of the rotating uniform and non-uniform multifunctional smart sandwich composite plates. [Display omitted]
ISSN:0266-3538
1879-1050
DOI:10.1016/j.compscitech.2021.109203