A Finite Element Procedure for Analysis of Laminated Composite Plates
Abstract
A variational formulation and finite-element implementation of the well-known discrete laminate theory of laminated composite plates is presented. To allow for varying properties of different layers with respect to the fixed reference frame used in the analysis, a linear variation of 'in-plane' displacements over each layer is assumed. The rate of variation can be different for each layer. The coupling between 'in-plane' and 'transverse' deformation is allowed for as is deformation due to shear. The mathematical model essentially assumes the laminated plate to be a stacking of Mindlin's orthotropic plates allowing for interfacial continuity of displacement. A finite element scheme implementing the foregoing concepts is described. Through the thickness, nodal points are used to reduce the problem to one of two-dimensional geometry. Three different interpolation schemes viz., the eight-point serendipity, the nine- point Lagrangian and the four-point Lagrangian are used in the isoparametric elements and their effectiveness is compared. The numerical procedure is verified against available solutions and then applied to analysis of stresses in a multi-ply free-edge delamination specimen. The procedure does not satisfy the traction-free edge condition and, therefore, the approach cannot be used to predict delamination and its growth.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jun 18, 1991
- Accession Number
- ADA250902
Entities
People
- M. Moazzami
- R. S. Sandhu
- W. E. Wolfe
Organizations
- Ohio State University