Geometrical Nonlinear Analysis of Thin Composite Plates Based on DKT Element

摘要

This paper aims to FE nonlinear analysis of thin isotropic and also symmetrical composite plates based on DKT (Discrete Kirchhoff Triangular) element. The nonlinear analysis of a plate is a more accurate and complicated case than linear analysis and has found significant application in the structural analysis, especially in air-structures, shells and plates. In many current FEM researches, finding an appropriate structural theory, element with sufficient number of nodes and degrees of freedom, per node, is of interest of scholars. In this article the geometrical nonlinear analysis of thin plates based on Kirchhoff- Love theory is considered. The DKT element, with 5 DoFs in each node, and nonlinear strains are used here. The FEM is used for analyzing and finally, Newton-Raphson method is used for solving the nonlinear problem. Results are compared with the other references (including thin and thick plate theories) and the accuracy of this work is shown in comparison with those valid results.