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Structural Engineering and Mechanics Volume 85, Number 4, February25 2023 , pages 445-459 DOI: https://doi.org/10.12989/sem.2023.85.4.445 |
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Free vibration analysis of FG composite plates reinforced with GPLs in thermal environment using full layerwise FEM |
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Mohammad Sadegh Tayebi, Sattar Jedari Salami and Majid Tavakolian
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| Abstract | ||
| The current investigation is the first endeavor to apply the full layerwise finite element method (FEM) in free vibration analysis of functionally graded (FG) composite plates reinforced with graphene nanoplatelets (GPLs) in thermal environment. Unlike the equivalent single-layer (ESL) theories, the layerwise FEM focuses on all three-dimensional (3D) effects. The GPLs weight fraction is presumed invariable in each layer but varies through the plate thickness in a layerwise model. The modified Halpin-Tsai model is employed to acquire the effective Young's modulus. The rule of mixtures is applied to specify the effective Poisson's ratio and mass density. First, the current method is validated by comparing the numerical results with those stated in the available works. Next, a thorough numerical study is performed to examine the influence of various factors involving the pattern of distribution, weight fraction, geometry, and size of GPLs, together with the thickness-tospan ratio, thermal environment, and boundary conditions of the plate, on its free vibration behaviors. Numerical results demonstrate that employing a small percentage of GPL as reinforcement considerably grows the natural frequencies of the pure epoxy. Also, distributing more square-shaped GPLs, involving a smaller amount of graphene layers, and vicinity to the upper and lower surfaces make it the most efficient method to enhance the free vibration behaviors of the plate. | ||
| Key Words | ||
| boundary conditions; finite element approach; full layerwise theory; functionally graded composite plate; graphene nanoplatelets; natural frequency | ||
| Address | ||
| Mohammad Sadegh Tayebi: Department of Mechanical Engineering, West Tehran Branch, Islamic Azad University, Tehran, Iran Sattar Jedari Salami: Department of Biomedical Engineering, Central Tehran Branch, Islamic Azad University, Tehran, Iran Majid Tavakolian: Department of Mechanical Engineering, West Tehran Branch, Islamic Azad University, Tehran, Iran | ||