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Size-dependent thermo-mechanical free vibration analysis of functionally graded porous microbeams based on modified strain gradient theory

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Abstract

In present study, vibration analysis of functionally graded (FG) porous microbeam under thermal effects is investigated considering modified strain gradient theory (MSGT) of elasticity. As the main novelty of this study, in order to effectively acquire the effects of size of size-dependent porous structures, MSGT is employed (considers three material length scale parameters) rather than modified couple stress theory (MCST) (considers one material length scale parameter). The nonlinear governing equation of microbeam based on MSGT is derived from Hamilton’s principle and to determine the natural frequency of the system under simply supports, Navier solution is employed. Numerical results presented for different beam models and theories and are compared with those available in previous studies. The obtained results show that frequencies from MSGT are higher than those from MCST and also classical theory (CT), especially when the microbeam thickness is comparable to the microbeam length scale parameter. Also, increases in the temperature of microbeam working environment, lead to decrease of microbeam natural frequency. Finally, parametric study is performed on natural frequency of FG microbeams to indicate the effects of: temperature changes, length scale parameter, slender ratio, and gradient index and porosity volume fraction.

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Acknowledgements

The author gratefully acknowledges the financial support of this study from the Qazvin Islamic Azad University.

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  1. Faculty of Industrial and Mechanical Engineering, Qazvin Branch, Islamic Azad University, Qazvin, Iran

    Ali Akbar Pasha Zanoosi

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Zanoosi, A.A.P. Size-dependent thermo-mechanical free vibration analysis of functionally graded porous microbeams based on modified strain gradient theory. J Braz. Soc. Mech. Sci. Eng. 42, 236 (2020). https://doi.org/10.1007/s40430-020-02340-3

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  • DOI: https://doi.org/10.1007/s40430-020-02340-3

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