FREE VIBRATION ANALYSIS OF LAMINATED COMPOSITE PLATE WITH ELASTO-PLASTIC LAYERS

The present work aims to study free vibration of laminated composite plate with and without included elastoplastic layer carried out by applying the finite element method on two composite specimens [0 degrees/45 degrees/-45 degrees/90 degrees]s and [45 degrees/-45 degrees/-45 degrees/45 degrees]s. First, we validate using the results obtained from previous literature. The results obtained show a very good agreement between experimental and numerical simulations. Secondly, nonlinearity can be created by including the elastoplastic layer in the laminated composite plate, then we deal with the comparison between linear and nonlinear structure. The effects of structural parameters and boundary conditions of modular ratio on vibrations are investigated.