Use of the Hybrid-Stress Finite-Element Model for the Static and Dynamic Analysis of Multilayer Composite Plates and Shells.

摘要

This report presents the results of an investigation into the formulation and application of assumed-stress hybrid finite-elements for bending of multilayer laminated plates and shells. Two families of hybrid-stress-based multilayer plate elements are considered; these elements are denoted as thick plate and moderately-thick plate elements. In the development of the thick plate elements, transverse shear deformation effects are included by allowing lines normal to the plate midsurface in the undeformed state to be piecewise linear from layer to layer in the deformed state. Transverse shear deformation effects are included in an average sense in the moderately-thick plate element family by assuming that straight lines normal to the plate midsurface prior to deformation remain straight but not necessarily normal to the plate midsurface after deformation. Comparison of the results obtained by using the thick plate and moderately-thick plate elements with independent analytical results shows that the moderately-thick plate elements are more efficient and practical for the analysis of multilayer structures having a large number of elastically dissimilar layers.