Nonlinear Investigation of Magnetic Influence on Dynamic Behaviour of Non-Homogeneous Varying Thickness Circular Plates Resting on Elastic Foundations
الموضوعات :
S.A Salawu
1
(
Department of civil and Environmental Engineering, University of Lagos, Akoka, Nigeria
)
G.M Sobamowo
2
(
Department of Mechanical Engineering, University of Lagos, Akoka, Lagos, Nigeria
)
O.M Sadiq
3
(
Department of civil and Environmental Engineering, University of Lagos, Akoka, Nigeria
)
الکلمات المفتاحية: Nonlinear vibration, Optimal homotopy asymptotic method, Three-parameter foundations, Variable thickness circular plates, Non-Homogeneous,
ملخص المقالة :
In this work, a nonlinear investigation of non-homogeneous varying thickness circular plates resting on elastic foundations under the influence of the magnetic fieldis investigated. The non-homogeneity of the circular plates’ material is presumed to occur due to linear and parabolic changes in Young’s modulus likewise the density along the radial direction in a unique manner. The geometric Von Kármán equations are used in modelling the governing differential equations. The transverse deflection is approximated using an assumed single term mode shape while the central deflection in form of Duffing’s equation is obtained using the Galerkin method. Subsequently, the semi-analytical solutions are provided using the Optimal Homotopy Asymptotic Method (OHAM), the analytical solutions are used for parametric investigation. The results in this work are in good harmony with past results in the literature. From the results, it is realized that the nonlinear frequency of the circular plate increases with an increase in the linear elastic foundation. Also, the results showed that clamped edge and simply supported edge condition produced the same hardening nonlinearity. However, varying taper and non-homogeneity lower the nonlinear frequency ratio. Also, maximum deflection occurs when excitation force is zero, and attenuation of deflection is observed due to the presence of a magnetic field, varying thickness, homogeneity, and elastic foundation. It is anticipated that the discoveries from this research will boost the design of structures subjected to vibration.
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