Estimation of Interlaminar Stresses in Laminated Plates Subjected to Transverse Loading using Three-dimensional Mixed Finite Element Formulation

摘要

Interlaminar shear stress distribution in laminated plates is investigated using mixed finite element formulation with 20-noded layered hexahedron element. The element developed contains three transverse displacements (u, v, w) and three interlaminar stresses (σ_z, τ_(xz), τ_(yz) ) as the nodat degrees of freedom for each node. The interlaminar stresses are imposed as constraints to the regular displacement formulations. The newly developed element is studied for convergence and patch test. The element is used to predict the deformation and interlaminar stress variation across the thickness and along the length in the interlayer of the laminate for cross-ply and angle-ply laminates for uniform and sinusoidal transverse loading. The results obtained using the present element compare well with the values available in the literature.