M Salehi - Associate Professor, Department of Mechanical Engineering, Amirkabir University of Technology, Tehran, Iran
P Marashizadeh - M.Sc, Department of Mechanical Engineering, Amirkabir University of Technology, Tehran, Iran
M Abshirini - M.Sc, Department of Mechanical Engineering, University of Tehran, Tehran, Iran

The three-layer annular composite sandwich sector plate is investigated numerically using the dynamic Relaxation (DR) method. The upper and lower layers of sandwich consist of rectangular orthotropic laminates, and the core is based on viscoelastic material. Bending of the plate is considered with the first-order shear deformation theory and large deflection type of deformation. The DR procedure is used for the solution of governing equations. Under uniform lateral pressure and clamped edged constraints, the plate deormation is predicted in different times. In order to verify the DR algorithm, the elastic sector plate compared with finite element solutions and it is established that the c rrelations are satisfactory. The dimensionless deflections, stress resultants and stress couples of sandwich plates with viscoelastic core are illustrated to show the creep behavior of the material.

Dynamic Relaxation (DR), composite sandwich, bending of sector plate, linear viscoelastic