Stress Analysis of Laminated Composite Plates by Higher Order Theory Using Finite Element Method

摘要

Finite Element Analysis is used to perform analysis on a laminated composite plate based on the Higher Order Shear Deformation Theory (HSDT). The theory accounts for variation of displacement &stresses, across the thickness of the laminate. The element formulated is a 9-noded iso-parametric quadrilateral element having 9 degrees of freedom at each node (HSDT9). In this analysis, the square plate is analyzed for uniformly distributed load and sinusoidal loads under simply supported boundary conditions. A program is written in MATLAB to obtain the finite element solutions for displacements & stresses. Solutions are obtained for laminate with cross-ply having different values of side to thickness ratios. The model is validated with the analytical results available in the literature.