Creep deflection of viscoelastic laminated cylindrical panels with initial deflection under axial compression

摘要

The viscoelastic behaviors of symmetric cross-ply and antisymmetric angle-ply cylindrical panels under axial compression are examined. The laminates considered are simply supported and have various amplitudes of initial imperfection. The analysis is based on the geometrically nonlinear viscoelastic approach. The stress function is obtained by solving the compatibility equation using the Laplace transform and a numerical integration scheme. Deflections are calculated by employing the generalized Galerkin method in conjunction with the numerical integration. The characteristics of creep deflection behaviors are illustrated, and a numerical procedure for tracing the post- snapping paths is provided. Effects of initial imperfection and the magnitude of loading on the creep buckling are studied. Numerical results for deflection histories and critical time for glass reinforced epoxy and glass reinforced vinyl ester laminates are presented. Solutions based on the quasi-elastic approach are also presented for comparison.