Thermomechanical postbuckling of geometrically imperfect flat and curved sandwich plates

摘要

This paper is concerned with the postbuckling of flat and curved sandwich panels under thermomechanical loadings. ^The mechanical loads consists of compressive/tensile edge loads, and a lateral pressure while the temperature field is assumed to exhibit a linear variation through the thickness of the panel. ^Towards obtaining the equations governing the postbuckling response, the extended Galerkin's method is used. ^The numerical illustrations concern doubly-curved, circular cylindrical, and flat panels of quadratic projection on a plane, all the edges being simply-supported. ^Moveable and immoveable tangential boundary in the directions normal to the edges are considered and their implications upon the thermomechanical load carrying capacity are emphasized. ^Effects of the radii of curvature and of initial geometric imperfections upon the load-carrying capacity of sandwich panels are also considered and their influence upon the attenuation of the intensity of the snap-through buckling are discussed. ^It is shown that in special cases involving the thermomechanical loading and initial geometric imperfection, the snap-through phenomenon can occur also in the case of flat sandwich panels. ^(Author)