NUMERICAL FORMULATION IN FINITE ELEMENTS OF DAMPING IN COMPOSITES MATERIALS USING FIRST-ORDER SHEAR DEFORMATION THEORY

摘要

In this paper, procedures for the finite element modeling of composite sandwich structures incorporating viscoelastic materials are presented. The numerical analysis was developed using the First-order Shear Deformation Theory (FSDT), which is implemented in a rectangular Serendipity element containing eight nodes and five degrees of freedom per node. The incorporation of the damping into the composite laminated plate finite element models is made by using the complex modulus approach and the numerical resolution of the resulting equations of motion are particularly relevant aspects of the modeling procedures since the viscoelastic stiffness matrix is frequency- and temperature- dependent. After the discussions of various theoretical aspects, the frequency responses functions are calculated for laminated composite plates with viscoelastic layers.