Paper number 453

FINITE ELEMENT POSTPROCESS METHOD FOR COMPOSITE PLATES WITH GENERAL LAYUPS

MAENGHYO CHO and YEOUNJIN CHOI

Department of Aerospace Engineering, Inha University, 253 Yong-Hyun Dong,
Nam-Ku, Inchon, 402-751, Republic of Korea

Summary

A postprocess method is developed for general layup configurations in the finite element framework. The previous developed postprocess method for symmetric cross-ply layup is extended for 2-dimensional various layup configurations. For the general layup configurations, not only shear angles but also reference in-plane displacement matchings are needed between higher order theory and first order shear deformation theory. Additionally, in-plane equilibrium equations of higher order shear deformation theory are utilized in each elements to satisfy the transverse shear free conditions at the top and bottom surface of the laminates. Basic framework of the postprocess method is preserved. In order to recover accurate transverse shear stresses, third order derivatives of w need to be calculated in each elements. Finite different schemes are used to compute reliable third order derivatives of the deflections. Numerical examples demonstrate the accuracy and simplicity of the present method for various layup configurations.

Keywords

postprocess method, first order shear deformation theory, efficient higher order plate theory, laminated composite plate, shear correction factors, energy equivalence, finite element method.