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Three-dimensional vibrations of annular thick plates with linearly varying thickness

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Abstract

The free vibration of annular thick plates with linearly varying thickness along the radial direction is studied, based on the linear, small strain, three-dimensional (3-D) elasticity theory. Various boundary conditions, symmetrically and asymmetrically linear variations of upper and lower surfaces are considered in the analysis. The well-known Ritz method is used to derive the eigen-value equation. The trigonometric functions in the circumferential direction, the Chebyshev polynomials in the thickness direction, and the Chebyshev polynomials multiplied by the boundary functions in the radial direction are chosen as the trial functions. The present analysis includes full vibration modes, e.g., flexural, thickness-shear, extensive, and torsional. The first eight frequency parameters accurate to at least four significant figures for five vibration categories are obtained. Comparisons of present results for plates having symmetrically linearly varying thickness are made with others based on 2-D classical thin plate theory, 2-D moderate thickness plate theory, and 3-D elasticity theory. The first 35 natural frequencies for plates with asymmetrically linearly varying thickness are compared to the finite element solutions; excellent agreement has been achieved. The asymmetry effect of upper and lower surface variations on the frequency parameters of annular plates is discussed in detail. The first four modes of axisymmetric vibration for completely free circular plates with symmetrically and asymmetrically linearly varying thickness are plotted. The present results for 3-D vibration of annular plates with linearly varying thickness can be taken as benchmark data for validating results from various plate theories and numerical methods.

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Authors and Affiliations

  1. College of Civil Engineering, Nanjing University of Technology, 210009, Nanjing, People’s Republic of China

    D. Zhou

  2. Department of Civil Engineering, The University of Hong Kong, Pokfulam Road, Hong Kong, People’s Republic of China

    S. H. Lo

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  1. D. Zhou
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  2. S. H. Lo
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Correspondence to D. Zhou.

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Zhou, D., Lo, S.H. Three-dimensional vibrations of annular thick plates with linearly varying thickness. Arch Appl Mech 82, 111–135 (2012). https://doi.org/10.1007/s00419-011-0543-y

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  • DOI: https://doi.org/10.1007/s00419-011-0543-y

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