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Browsing by Author "Soares, C. A. Mota"

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  • Buckling and Geometrically Nonlinear Analysis of Sandwich Structures
    Publication . Moita, J. S.; Araújo, A. L.; Correia, Victor M. Franco; Soares, C. M. Mota; Soares, C. A. Mota
    In this work a finite element model is presented for buckling and nonlinear analysis of multilayer sandwich plates and shells, with a soft core sandwiched between stiff elastic layers. The finite element is obtained by assembling all element-layers through the thickness using specific assumptions on the displacement continuity at the interfaces between layers, but allowing for different behaviors of the layers. The stiff elastic layers are modelled using the classic plate theory and the core is modelled using Reddy׳s third order shear deformation theory. The present finite element model is a non-conforming triangular plate/shell element with 24 degrees of freedom for the generalized displacements. This model is applied in the solution of illustrative examples and the results are presented and discussed.
    2015Journal article Restricted access Show more
  • Layerwise mixed least-squares finite element models for free vibration analysis of multilayered piezoelectric composite plates
    Publication . Mesquita, Teresa; Moleiro, Filipa; Araujo, A. L.; Soares, C. M.Mota; Soares, C. A. Mota
    This work provides an assessment of a finite element model based on layerwise mixed formulation using least squares applied to plate sandwich structures with skins made of piezoelectric layers and the core with composite angle play laminate layers. The extension to free vibration analysis is developed. The model assumes a layerwise variable description of displacements, transverse stresses and in-plane strains, taken as independent variables. The layerwise mixed formulation enables the fulfilment of the so-called C0z, yielding, for free vibration analysis a symmetric quadratic eigenvalue problem. The present model has nine degrees of freedom(dof ) per node in the core and in the upper and lower piezoelectric skins thirteen (nine to mechanical and four electrical) per node. The numerical examples show that the model predictive capabilities are in excellent agreement with three-dimensional exact solutions and also with available alternative models, from very thick to very thin sandwich piezoelectric plates.
    2015Journal article Restricted access Show more