Abstract
In this paper, a novel meshfree approach is proposed for the free vibration analysis of ply drop-off laminated conical and cylindrical shells and annular plates. The theoretical formulation for free vibration analysis is based on the first-order shear deformation theory, and the field functions are approximated by a novel meshfree Tchebychev-radial point interpolation method shape function using Tchebychev polynomials and Gaussian radial functions as the basis. The governing equations and boundary conditions for the substructures of ply drop-off laminated composite shell are derived, and the equations of the whole system are obtained by combining them using a continuous condition. The boundary and continuous conditions are generalized by the introduction of an artificial spring technique, and the type of boundary conditions is selected according to the spring stiffness values. The accuracy and reliability of the proposed method are verified by comparing the results in the literature and of the finite element program ABAQUS. The free vibration characteristics including natural frequencies and mode shapes of ply drop-off laminated composite shells with various geometrical dimensions and boundary conditions are presented through numerical examples.
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Kwak, S., Kim, K., Jong, G. et al. A meshfree approach for free vibration analysis of ply drop-off laminated conical, cylindrical shells and annular plates. Acta Mech 232, 4775–4800 (2021). https://doi.org/10.1007/s00707-021-03084-4
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DOI: https://doi.org/10.1007/s00707-021-03084-4