Paper number 547

DESIGN OF HYBRID LAMINATED COMPOSITE SANDWICH PANELS FOR MAXIMUM BUCKLING LOADS: THE INFLUENCE OF THERMAL ACTIONS

Maria Antonietta AIELLO1 and Luciano OMBRES2

1,2Department of Materials Science, University of Lecce,
Via per Arnesano, 73100 Lecce, Italy

Summary In the paper, the better arrangement of sandwich flat panels made with hybrid laminated faces is analyzed in order to maximize the local buckling loads in presence of in-plane and/or thermal loads. Laminated hybrid faces, generally unsymmetric and made with outer high stiffness layers and inner low stiffness layers, are modeled as composite plates resting on an elastic two-parameter foundation. Using the First Order Shear Deformation Theory in conjunction with the Rayleigh-Ritz method, buckling loads are obtained by an energetic algorithm as a solution of a standard eigenvalue problem. Results of the analysis evidence as: i) the hybridisation of laminated faces furnishes a good improvement of the buckling loads also for low percentage of high stiffness materials; ii) the better arrangement of outer high stiffness layers are depending on both in-plane loads combinations and thermal loads; iii) thermal actions, in some cases, can drastically reduce the buckling loads.
Keywords sandwich panels, hybrid faces, thermal actions, buckling loads.

Theme : Composite Structures ; Modelling

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