Abstract
In this study, the free vibration analysis of a functionally graded microbeam (FGM) resting on a foundation with Winkler, Pasternak and nonlinear stiffness was undertaken. The free vibration of the FGM was modeled using the classical rule of mixture and Mori–Tanaka homogenization schemes for the material properties, the modified coupled stress theory to account for the size-dependent effects and the von Karman strain–displacement relation to account for the geometric nonlinearity. The resultant partial differential equation was transformed to an ordinary differential equation (ODE) by the Galerkin method. The governing ODE is in the form of a Helmholtz–Duffing oscillator that is applicable to isotropic microbeam as well as the FGM. The Helmholtz–Duffing model was solved using the continuous piecewise linearization method, which compared well with numerical solutions and was shown to be more accurate than other published approximate solutions. Detailed analysis of various parameters affecting the dynamic response of the FGM was conducted and revealed many interesting results. The Young modulus ratio, foundation stiffness parameters, power law index and type of boundary condition were seen to influence the vibration response of the FG microbeam. Specifically, a stronger nonlinear response was observed when (a) the length scale parameter, which represents the size effect, is significantly smaller than the thickness of the microbeam, (b) the nonlinear stiffness parameter increases, (c) the power index value is unity and (d) the boundary conditions are less restrictive. Lastly, the effect of thermal load on the buckling of the microbeam was investigated and showed that the thermal buckling load depends on the aspect ratio, length scale ratio and boundary conditions of the FG microbeam.
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Alfred, P.B., Ossia, C.V. & Big-Alabo, A. Free nonlinear vibration analysis of a functionally graded microbeam resting on a three-layer elastic foundation using the continuous piecewise linearization method. Arch Appl Mech 94, 57–80 (2024). https://doi.org/10.1007/s00419-023-02505-1
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DOI: https://doi.org/10.1007/s00419-023-02505-1