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Flexural vibration of imperfect functionally graded beams based on Timoshenko beam theory: Chebyshev collocation method

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Abstract

Flexural vibration analysis of beams made of functionally graded materials (FGMs) with various boundary conditions is considered in this paper. Due to technical problems during FGM fabrication, porosities and micro-voids can be created inside FGM samples which may lead to the reduction in density and strength of materials. In this investigation, the FGM beams are assumed to have even and uneven distributions of porosities over the beam cross-section. The modified rule of mixture is used to approximate material properties of the FGM beams including the porosity volume fraction. In order to cover the effects of shear deformation, axial and rotary inertia, the Timoshenko beam theory is used to form the coupled equations of motion for describing dynamic behavior of the beams. To solve such a problem, Chebyshev collocation method is employed to find natural frequencies of the beams supported by different end conditions. Based on numerical results, it is revealed that FGM beams with even distribution of porosities have more significant impact on natural frequencies than FGM beams with uneven porosity distribution.

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Authors and Affiliations

  1. Department of Mechanical Engineering, Mahanakorn University of Technology, Nongchok, Bangkok, 10530, Thailand

    Nuttawit Wattanasakulpong

  2. Department of Mechanical and Aerospace Engineering, Research Centre for Advanced Computational and Experimental Mechanics (RACE), King Mongkut’s University of Technology North Bangkok, Bangkok, 10800, Thailand

    Arisara Chaikittiratana

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  1. Nuttawit Wattanasakulpong
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  2. Arisara Chaikittiratana
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Correspondence to Nuttawit Wattanasakulpong.

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Wattanasakulpong, N., Chaikittiratana, A. Flexural vibration of imperfect functionally graded beams based on Timoshenko beam theory: Chebyshev collocation method. Meccanica 50, 1331–1342 (2015). https://doi.org/10.1007/s11012-014-0094-8

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  • DOI: https://doi.org/10.1007/s11012-014-0094-8

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