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2020 | 141 | 24-47
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On the nonlinear analysis of isotropic circular plate resting on viscoelastic foundation

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Nonlinear analysis of isotropic circular plate resting on viscoelastic foundation is investigated. The dynamic analogue of Von Kármán equations is considered in establishing the governing equation also, consideration is given to symmetric and axisymmetric mode. Thereafter, the coupled nonlinear partial differential equations are transformed to Duffing equation using Galerkin method and analysed using Optimal Homotopy Asymptotic Method (OHAM). Subsequently, the analytical solutions are used to investigate the influence of various parameters on the dynamic response of the plate. It is observed that, nonlinear frequency ratio increases with increase linear Winkler, Pasternak foundation and tensile force. Nevertheless, it is established that the nonlinear frequency ratio of the plate decreases as nonlinear Winkler foundation and compressive force increase. Also, the results revealed that both clamped and simply supported edge condition results in softening nonlinearity behaviour. Conversely, axisymmetric case of vibration gives lower nonlinear frequency ratio compared to asymmetric case. Furthermore, maximum deflection occurs when excitation force is zero, likewise the presence of viscoelastic foundation results in attenuation of deflection for the circular plate. It is expected that findings from the study will add values to the existing knowledge of classical vibration.
Physical description
  • Department of Civil and Environmental Engineering, University of Lagos, Akoka, Nigeria
  • Department of Mechanical Engineering, University of Lagos, Akoka, Lagos, Nigeria
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