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Nonlinear Static Analysis of a Bi-directional Functionally Graded Microbeam Based on a Nonlinear Elastic Foundation Using Modified Couple Stress Theory

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Abstract

In the present paper, a size-dependent Euler–Bernoulli beam model has been developed for nonlinear static analysis of a bidirectional functionally graded (BFG) microbeam based on a nonlinear elastic foundation according to the modified couple stress theory. In order to eliminate stretching and bending coupling caused by the non-symmetrical material variation along with the thickness, the problem is formulated with regard to the physical middle surface. By using Hamilton’s principle, the underlying equations of motion, as well as the relevant boundary conditions of the problem, were deduced. The generalized differential quadrature method (GDQM) has also been utilized for solving the underlying equations for pinned–pinned (PP) and clamped–clamped (CC) boundary conditions to obtain the natural frequencies of the BFG microbeam. The precision of the present solution is evaluated through comparing the nonlinear static deflection provided by the proposed approach with the results available from previous studies. The results show that the average error of the proposed approach with the results available from previous studies is 1.3%. In addition, a parametric study has been performed to explore the impacts of the gradient indices, material length scale parameter, end supports, and the stiffness coefficients of the nonlinear foundation on the nonlinear static deflection of the BFG microbeam. The results indicate that the increase in KNL has increased the value of WNL/WL, and the effect of KNL on the increase in nonlinear deflection is more than that of linear deflection. Furthermore, the results illustrate that incrementing dimensionless length scale parameter l0 increases the nonlinear deflection ratio WNL/WL so that increasing l0 from 0.25 to 1 increases the nonlinear deflection ratio for KP = 10 by about 4%, while for KP = 100, it is about 1%.

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Authors and Affiliations

  1. Centre for Infrastructure Engineering, Western Sydney University, Penrith, Australia

    Mojtaba Gorji Azandariani

  2. Department of Civil Engineering, Yasouj University, Yasouj, Iran

    Mohammad Gholami & Ehsan Vaziri

  3. Department of Civil Engineering, Islamic Azad University of Bushehr, Bushehr, Iran

    Akbar Nikzad

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  1. Mojtaba Gorji Azandariani
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Correspondence to Mohammad Gholami.

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Gorji Azandariani, M., Gholami, M., Vaziri, E. et al. Nonlinear Static Analysis of a Bi-directional Functionally Graded Microbeam Based on a Nonlinear Elastic Foundation Using Modified Couple Stress Theory. Arab J Sci Eng 46, 12641–12651 (2021). https://doi.org/10.1007/s13369-021-06053-0

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